Zitat Jim Free@JimFree Loading LH2 into @NASA_SLS’s Core Stage now. Propellants are traveling through the Tail Service Mast Umbilical, which is mounted to the base of the mobile launcher. The TSMUs provide fluid line and electrical cable connections to the SLS Core Stage engine section. #Artemis 2:16 PM · Sep 3, 2022·Twitter Web App
Zitat Jeff Foust@jeff_foust The SLS core stage LOX tank is back in fast fill. Still doing manual fill of the LH2 tank while working on the quick-disconnect leak; “going well” so far. 2:19 PM · Sep 3, 2022·Tweetbot for Mac
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat Jeff Foust@jeff_foust Launch is now officially scrubbed for today. 5:18 PM · Sep 3, 2022·Tweetbot for Mac
Now safing the rocket and will be detanking the core stage. (Never got to loading the upper stage.) No word on the next launch opportunity; Monday and Tuesday are the last available days in this launch period.
Press conference about todays’s schedule tentatively planned for 4 pm EDT this afternoon.
Zitat Eric Berger @SciGuySpace Hearing a rollback to the VAB of the SLS rocket is likely, but I don't have confirmation. If that happens, it is very likely that Artemis I does not launch before October 17, at the earliest. 5:41 PM · Sep 3, 2022·TweetDeck
Zitat 09/03/2022 17:51 Assuming teams can fix the hydrogen leak that caused today's scrub, NASA has two more launch opportunities in this Artemis 1 launch period: • Monday at 5:12 p.m. EDT (2112 GMT) with a 90-minute window • Tuesday at 6:57 p.m. EDT (2257 GMT) with a 24-minute window If the Artemis 1 mission can't get off the ground by Tuesday, the Space Launch System moon rocket will have to roll back to the Vehicle Assembly Building for re-testing of its flight termination system, forcing a weeks-long delay.
09/03/2022 18:18 NASA Administrator Bill Nelson says the Artemis 1 mission management team will meet this afternoon to discuss the next steps for the launch campaign. They will determine whether to make another launch attempt Monday or Tuesday, or roll the Space Launch System moon rocket back to the Vehicle Assembly Building for repairs and re-testing. If the rocket has to return to the VAB, the Artemis 1 launch will be delayed to October. The next launch period opens Sept. 19 and closes Oct. 4, but it's more likely the the flight would be pushed back to a launch period opening Oct. 17. "We'll go when we're ready," Nelson said. "This is part of our space program -- be ready for scrubs."
Zitat Emre Kelly@EmreKelly Nelson confirms: if SLS has to roll back to the VAB, Artemis I won’t fly before October. Next window opens Sept. 19, closes Oct. 4. Then opens again for two weeks starting Oct. 17. 6:13 PM · Sep 3, 2022·Twitter for Mac
Zitat William Harwood @cbs_spacenews SLS/Artemis 1: NASA Administrator Bill Nelson says the MMT will "look at it and see is there's still a possibility (to launch in the current period) or if they're going to have to roll back to the Vehicle Assembly Building." 6:25 PM · Sep 3, 2022·Twitter for Mac
Wir warten aufs Warten (in diesem Fall die offizielle PK um [2-2-:-0-0] 22:30 MESZ); aber der Flurfunk sagt dies:
Zitat Chris Bergin - NSF @NASASpaceflight
Pending post-MMT presser for official words, but the word going around the SLS circles cites evaluations of an October 17 target. So that'd be a rollback to the VAB.
Curious if they'll work in a full WDR when back at 39B or just go for launch.
9:28 PM · Sep 3, 2022·Twitter Web App
Zitat Eric Berger @SciGuySpace·16m Replying to @NASASpaceflight and @TheFavoritist
I think they may eventually push that to October 19 as the mission duration isn't optimal for the 17th and 18th.
Zitat Jeff Foust @jeff_foust Post-scrub briefing now expected no earlier than 4:30pm EDT. 9:37 PM · Sep 3, 2022·Tweetbot for Mac
September ist vom Tisch, aber womöglich keine weitere Rangierfahrt ins VAB.
Zitat Eric Berger @SciGuySpace NASA will not attempt a launch this period, which ends Tuesday September 6. They may not roll back right away, preferring to do some additional work at the pad. Details will be forthcoming at a news conference that starts around 4:30 pm ET (20:30 UTC). 9:59 PM · Sep 3, 2022·TweetDeck
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat Jeff Foust @jeff_foust Jim Free: will not in this launch period, which ends Tuesday. What happens in next two periods (late Sept/early Oct, and mid-late Oct) will depend on options the team comes up with by Monday or Tuesday.
Mike Sarafin: inadvertent overpressurization of hydrogen line during chilldown. Can’t rule out the quick-disconnect fitting saw some effects of that, but too early to tell. 10:35 PM · Sep 3, 2022·Tweetbot for Mac
Zitat Spaceflight Now @SpaceflightNow NASA has ruled out another Artemis 1 launch attempt Monday or Tuesday, the last day in the mission's current launch period. Watch the ongoing press conference: 10:39 PM · Sep 3, 2022·TweetDeck
Zitat Jeff Foust@jeff_foust About the overpressurization: the wrong valve was commanded and rectified in about 3-4 seconds. Carefu; to say it is not necessarily the cause of the LH2 leak; more analysis needed. 11:03 PM · Sep 3, 2022·Tweetbot for Mac
Free: if FTS is extended and leak can be repaired on the pad, still have to look at issues abut Orion life on the pad to see if can stay there vs rollback.
Sarafin: pros and cons of doing work on the pad. A little early to say what the right path forward is. 11:08 PM · Sep 3, 2022·Tweetbot for Mac
Zitat Jeff Foust@jeff_foust NASA says they will attempt to replace the seal on the LH2 line that led to the SLS scrub Saturday while the vehicle is still at the pad. However, the SLS may still roll back to the VAB for other work and would currently have to do so to reset its FTS. https://blogs.nasa.gov/artemis/2022/09/0...o-replace-seal/ 12:43 AM · Sep 7, 2022·Tweetbot for Mac
Zitat Teams Continue to Review Options for Next Attempt, Prepare to Replace Seal
After standing down on the Artemis I launch attempt Saturday, Sept. 3 due to a hydrogen leak, teams have decided to replace the seal on an interface, called the quick disconnect, between the liquid hydrogen fuel feed line on the mobile launcher and the Space Launch System (SLS) rocket while at the launch pad.
Performing the work at the pad requires technicians to set up an enclosure around the work area to protect the hardware from the weather and other environmental conditions, but enables engineers to test the repair under cryogenic, or supercold, conditions. Performing the work at the pad also allows teams to gather as much data as possible to understand the cause of the issue. Teams may return the rocket to the Vehicle Assembly Building (VAB) to perform additional work that does not require use of the cryogenic facilities available only at the pad.
To meet the current requirement by the Eastern Range for the certification on the flight termination system, NASA would need to roll the rocket and spacecraft back to the VAB before the next launch attempt to reset the system’s batteries.
Additionally, teams will also check plate coverings on other umbilical interfaces to ensure there are no leaks present at those locations. With seven main umbilical lines, each line may have multiple connection points.
Zitat Chris Bergin - NSF @NASASpaceflight NASA confirms they are working on the TSMU at the pad for now. No decision on rolling back or staying at 39B at this time.
Pending official Artemis I plan. Option discussed: If FTS battery work (requires rollback to VAB) is waived, TSM(U) repairs may be conducted at the pad, followed by a modified WDR with LH2 Fast Fill = path to September 21 NET launch. 12:42 AM · Sep 7, 2022·Twitter Web App
Zitat Eric Berger @SciGuySpace Perspective from a former space shuttle program manager as NASA goes to the range operator at Kennedy Space Center, asking for a rather significant waiver on the SLS rocket’s flight termination system.
Zitat Wayne Hale @waynehale · 12m In my time I went hat in hand to the Eastern Range to ask them to change a rule in our favor several times. Let’s just say my batting average was rather low. 3:15 PM · Sep 7, 2022·Twitter for iPhone
"Range safety" is a rather confusing term. For launch ranges—in this case the Eastern Range, which encompasses KSC—it means the US military branch responsible for ensuring safety around the launch site. Could be Army, could be Air Force. In this case its the US Space Force.
So NASA is going to Space Launch Delta 45 and trying to convince them that the Flight Termination System batteries they certified for 20 days, and then waivered to 25 days, should receive yet another waiver to 40+ days. Should get an answer in a day or two.
Ich hab' das zwar schon diverse Male geschrieben, aber damit das niemand aus den Tiefen der Stränge fischen muß: Die Batterien des Flight Abort Systems/der Rettungsrakete sind für 20 Tage nach dem letzten Check freigegeben. Für die Artemis I-Mission ist das noch mal um 5 Tage verlängert worden, um den letzten möglichen Starttermin gestern, am 6.9., mitnehmen zu können. Wenn eine weitere Verlängerung nicht erfolgt, muß das SLS aus jeden Fall noch einmal in die Montagehalle zurückgefahren werden, bevor der tatsächliche Start ansteht.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat Spaceflight Now @SpaceflightNow Ground teams at NASA's Kennedy Space Center have installed work platforms at the launch pad to begin repairing a leaky liquid hydrogen fueling line near the bottom of the core stage of the Space Launch System moon rocket. 7:30 PM · Sep 7, 2022·TweetDeck
Zitat Technicians at NASA’s Kennedy Space Center will repair a leak in a liquid hydrogen fueling line on the Artemis 1 moon rocket the launch pad rather than inside the Vehicle Assembly Building, a decision the agency says will enable teams to test the repair under cryogenic conditions.
NASA’s launch team detected a leak in a quick-disconnect fitting on an 8-inch liquid hydrogen line during a launch attempt Saturday, forcing managers to stop the countdown. The leak was in a similar location but more significant than hydrogen leaks encountered during previous tankings of the huge Space Launch System moon rocket.
Ground teams at Launch Complex 39B will replace the seal on the quick-disconnect interface where the liquid hydrogen fueling line from the mobile launch platform hooks up to a hydrogen line on the core stage of the Space Launch System.
Technicians will erect an environmental enclosure around the work area at the tail service mast umbilical, gray housings that stick above the deck of the mobile launch platform to feed liquid hydrogen and liquid oxygen into the rocket. The tent will protect sensitive components in the umbilical area from weather and contamination.
NASA officials said after Saturday’s scrubbed launch attempt that they were considering options to repair the hydrogen leak at the pad or inside the Vehicle Assembly Building, which would require the rocket to roll the 4.2-mile (6.8-kilometer) distance back to the hangar on a diesel-powered crawler-transporter. A benefit of repairing the leak at the pad is that the launch team will be able to confirm the tightness of the umbilical seal under cryogenic conditions.
Teams will flow super-cold liquid hydrogen, chilled to minus 423 degrees Fahrenheit, through the umbilical line to see if it still leaks. The shape and size of seals and gaskets can change when exposed to super-cold temperatures, creating a leak path that wasn’t detectable at ambient temperatures. A molecule of liquid hydrogen, created by bonding two hydrogen atoms together, is one of the tiniest known in the universe, and leak through gaps impermeable to other molecules.
Zitat Jeff Foust @jeff_foust NASA’s Jim Free: requesting dates of Sept. 23 and 27 on the Eastern Range for next Artemis 1 launch attempts. Still working with the Eastern Range on a waiver for FTS battery retest. Proposed dates avoid DSN conflicts with DART impact on Sept. 26.
Mike Bolger, Exploration Ground Systems program manager, says work is underway to replace seals on two liquid hydrogen lines. Work could be done by the end of the day today if weather holds. That would support another tanking test Sept. 17.
Bolger says they don’t know yet if the inadvertent overpressurization during Saturday’s attempt damaged the seal. It did not exceed hardware specs, though. 5:05 PM · Sep 8, 2022·Tweetbot for Mac
Zitat Spaceflight Now @SpaceflightNow NASA plans to perform a tanking test on the Artemis 1 moon rocket around Sept. 17. Here are the launch times for Sept. 23 and 27:
• Sept. 23 at 6:47am EDT (1047 GMT) with a 120-minute window
• Sept. 27 at 11:37am EDT (1537 GMT) with a 70-minute window
Zitat Jeff Foust @jeff_foust The Sept. 17 tanking test will involve filling the tanks on both the core and upper stages. But it won’t be a full-fledged wet dress rehearsal: they feel they accomplished all the WDR goals in past tests (even though none made it to the planned cutoff time.) 5:38 PM · Sep 8, 2022·Tweetbot for Mac
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Wir erinnern uns: der kleine Pioniersatellit, der am 28. Juni von Neuseeland aus auf den Weg zum Mond gebracht wurde, um den NRHO zu durchlaufen, den "Near Rectilinear Halo Orbit," den die Artemis I-Mission um den Mond einschlagen soll und auf dem auch die "Gateway"-Raumstation kreisen soll. Am 8. September hat die NASA den Kontakt zur Sonde (zum 2. Mal) verloren. Update:
Zitat CAPSTONE Mission: 12 September 2022 Update
On September 10th we provided an update on the CAPSTONE mission and below are updated details on the situation.
This is a dynamic operational situation, and the below details are provided based on our best knowledge at time of release. Updates to below information will be provided as we learn more.
During or shortly after the third trajectory correction maneuver (TCM-3) on September 8th, the spacecraft suffered an anomaly that resulted in the vehicle attitude rates growing beyond the capacity of the on-board reaction wheels to control and counter. The vehicle was attempting to communicate with the ground for approximately 24 hours before any telemetry was recovered. At the point of recovery, the spacecraft was not in a stable configuration, it was not power positive, and the system was experiencing periodic resets. Navigation data collected after the anomaly suggests that the maneuver was completed or nearly complete when the anomaly occurred. This means the spacecraft remains on the intended trajectory and on course to the near rectilinear halo orbit at the Moon. After the planned TCM-3 maneuver, the spacecraft did not return to ground communications as expected which provided the first indication that there might be an issue. Working with limited data, the combined operations team determined it was prudent to declare an operational emergency Thursday evening, September 8th. From this point forward, the teams at the NASA Deep Space Network, Terran Orbital, and Advanced Space have been working around the clock to work the problem, understand what is happening on the spacecraft, and identify options to recover the spacecraft to normal operations. Rapid response enabled by the Deep Space Network support and quick thinking by the team at Terran Orbital allowed mission operators to quickly reconfigure the operational state of the spacecraft to stabilize the situation while recovery plans could be further evaluated. Based on this exceptional effort and using the limited data available, the operations teams have determined that the spacecraft is in safe mode and appears to have successfully been placed in a stable state. The vehicle is in a rotating orientation that provides partial illumination of the solar panels and results in weak transmission signals from the spacecraft low gain antennas. Without the unique capabilities of the Deep Space Network, the mission team would have little or no information on the status of the spacecraft. Modeling of the expected orientation and state of the vehicle into the future suggests it will remain stable. The vehicle is on the orbital trajectory intended and understanding this allows for continued tracking from ground stations well into the future. The vehicle in its current configuration is power positive, meaning that it is generating more power from the solar panels than the system is utilizing. The mission operations team is currently focused on recovery plans. These efforts will begin by working to improve the thermal situation of several subsystems including the propulsion subsystem. While work is ongoing to diagnose the cause of the anomaly, the team is preparing the spacecraft to attempt a detumble operation to regain attitude control of the vehicle. This detumble operation was successfully demonstrated after separation from the launch vehicle in July. A successful detumble will result in the vehicle resuming control of its orientation, orienting the solar panels to the Sun to fully charge the batteries of the power used during the detumble. The spacecraft will then orient to the ground and await further instructions. These recovery operations will be further evaluated over the coming days. Recovery timing will be guided by the data and analysis available to maximize the probability of a successful spacecraft operation.
The combined mission team including the Deep Space Network, Terran Orbital, Stellar Exploration, and Advanced Space have been working in a disciplined and collaborative way to stabilize the CAPSTONE spacecraft and prepare for recovery. Many details remain unknown as to the cause of the anomaly and significant risks are continuing to be analyzed.
Terminverschiebung. Bislang war der (teilweise) Betankungstest für den 17. angekündigt; die Starttermine für den 23. und 27. September.
Zitat John Kraus @johnkrausphotos NASA is targeting no earlier than Sep. 27 with a potential backup date of Oct. 2 for the launch of SLS / Artemis I, pending a successful cryogenic tanking test on the 21st and a waiver from the Eastern Range in regards to the rocket’s flight termination system battery life. 2:22 AM · Sep 13, 2022·Twitter for iPhone
CAPSTONE received some relatively good news on the recovery progress for the spacecraft. The communications situation has dramatically improved, the power state of the spacecraft appears to be sufficient for continuous (duty cycled) heating of the propulsion system which dropped below its operational temperature, Over the past few days, CAPSTONE’s power – though limited by the orientation of the spacecraft in its spin relative to the Sun – appears to be sufficient for heating of the propulsion system. When the spacecraft propulsion system temps are at +5C for 12+ hours the system will be further evaluated for use in the recovery operation. Information on the cause of the anomaly has been obtained and is being evaluated, and recovery plans that mitigate risk of further anomalous behavior are being developed. We do not have a timeline for a recovery attempt, but the team is working hard to make progress guided by what we are learning from the data with an explicit goal to minimize further risk to the mission.
The spacecraft continues on its planned path to the Near Rectilinear Halo Orbit around the Moon.
We are effusively grateful to the teams at the Deep Space Network, NASA, Terran Orbital, and Advanced Space who have supported this ongoing effort continuously over the past 5 days. Without the quick action and dedicated attention of all of these exceptional individuals, the CAPSTONE mission would likely have been lost due to this anomaly. As it stands today, the vehicle is stable, and the combined mission operations team is working towards attempting a recovery operation.
Zitat Controllers are currently working on a plan to detumble the cubesat so that it can properly orient its solar panels and re-charge its batteries. CAPSTONE, short for Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment, is currently operating on low power as a result of the anomaly, but is no longer draining more energy than it is collecting. The probe is also dealing with some worrisome temperature issues. A recovery team consisting of experts from Advanced Space, NASA, Terran Orbital, and Stellar Exploration are currently being hampered by communications issues, though NASA’s Deep Space Network has linked the beleaguered cubesat to controllers on Earth.
Kleine Erklärung: der Bordantrieb des Cubesats ist ein sog. "monopropellanter." Als Treibstoff wird Hydrazin verwendet (N2H4), der über eine katalytische Reaktion Energie freisetzt. Als Katalyst werden zumeist kleine Kügelchen aus Aluminiumoxid verwendet, die mit einer Iridiumbeschichtung versehen sind. Für diese Reaktion muß der Treibstoff eine genau bestimmte Temperatur haben. Da der Satellit durch das letzte fatale Bahnlagemanöver ins Trudeln geraten ist, ist die Energieversorgung durch die Sonnenpaneele entspechend schwankend, was heißt, daß die Temperaturkontrolle des Treibstoffes ebensolchen Schwankungen unterliegt.
Nachtrag. Wie erinnerlich, ist CAPSTONE von Neuseeland aus gestartet worden, durch das Startup Rocketlab. Vor 40 Minuten, 22:40 MESZ, ist vom gleichen Startkomplex der japanische Radarsatellit StriX 1 der Firma Synspective mit einer Electron in die Umlaufbahn gebracht worden.
Zitat Synspective’s third SAR satellite, StriX-1, follows on from StriX-α and StriX-β which were launched in December 2021 and March 2022 with Rocket Lab, respectively. Unlike the previous two satellites, which are classified as demonstration satellites, StriX-1 is our first pre-commercial satellite for full-scale business expansion. This is in anticipation of the production and operation of multiple satellites in the future, with improved batteries and faster downlink speeds to capture more data and meet the needs of a wide range of customers from government to the private sector.
Following StriX-1, we will put three more satellites into orbit by the end of 2023. This will bring us closer to a planned constellation of 30 satellites for 2026 to enable wide-area, high-frequency Earth observation.
***
The SAR (Synthetic Aperture Radar) sends microwaves from the satellite to Earth and receives the reflected signal to create an image of the target area.
The observation by the SAR enables twenty-four hour monitoring, even with cloud coverage, when optical earth observation satellites are less effective.
The StriX satellites use X-band for precise monitoring. These features are suitable for the monitoring of the cities and infrastructures that are Synspective’s primary targets.
Zitat von Ulrich Elkmann im Beitrag #37Terminverschiebung. Bislang war der (teilweise) Betankungstest für den 17. angekündigt; die Starttermine für den 23. und 27. September.
Dieser Laden ist in Sachen Terminplanung fast so arg wie unsere Regierung mit ihrem "Spielen wir Atomkraftwerk?". Erst der 17.9., dann der 27. Jetzt der 21.
Zitat NASA_SLS @NASA_SLS MEDIA: @NASA will provide live coverage with commentary of the upcoming #Artemis I cryogenic demonstration test beginning at 7:15 a.m. EDT on Wednesday, Sept. 21. 10:02 PM · Sep 16, 2022·Sprinklr
Zitat Sep 16, 2022 MEDIA ADVISORY M22-134 - NASA to Televise Artemis I Demonstration Test, Host Media Call
NASA will provide live coverage with commentary of the upcoming Artemis I cryogenic demonstration test beginning at 7:15 a.m. EDT on Wednesday, Sept. 21.
The demonstration test will allow teams to confirm the repair to a hydrogen leak seen during an early September Artemis I launch attempt, evaluate updated propellant loading procedures, and conduct additional evaluations. The demonstration will conclude when the objectives for the test have been met.
Live coverage of the test will air on NASA Television, the NASA app, and the agency’s website. While NASA is airing coverage of the launch, rendezvous, docking, and hatch opening of the Soyuz MS-22 carrying NASA Astronaut Frank Rubio to the International Space Station on NASA’s Television’s Public Channel, the Artemis I demonstration test will air only on the Media Channel. During all other times, the test will air on both the Public and Media Channels.
Zitat NASA's Exploration Ground Systems @NASAGroundSys ARTEMIS I UPDATE: @NASA remains on track for an Artemis I cryogenic demonstration test on Wednesday, Sept. 21. Call to stations for the demonstration occurred at approx. 5 p.m. EDT today, Monday, Sept. 19. #Artemis 11:20 PM · Sep 19, 2022·Twitter Web App
Zitat Spaceflight Now @SpaceflightNow The countdown will get underway at 5:30 p.m. EDT (2130 GMT) for a crucial fueling test to determine if a leak in the Artemis 1 Space Launch System rocket has been fixed. Watch a live view from the Kennedy Space Center as the clock starts ticking: https://youtu.be/3973yl4mDoE 11:22 PM · Sep 19, 2022·TweetDeck
Wetter. Wir haben den Beginn der herbstlichen Sturmsaison im Nordaltantik. Bislang hat die amerikanische Ostküste damit Glück gehabt.
Zitat Eric Berger @SciGuySpace Invest 98L is a potential constraint to Artemis I activities. A launch date on Sept. 27 would be ahead of any potential impacts, but there is a decent chance the storm advances on Florida shortly after that point. May not be enough time to roll back in the event of a scrub
There remains an ocean of uncertainty about where the storm will ultimately track, but confidence is now very high in a tropical system developing in the Caribbean Sea and then moving north. Recent modeling suggests Florida is in play. 8:50 PM · Sep 20, 2022·TweetDeck
Countdown steht seit 2 Stunden bei -6:40:00 & wird beim Start der Betankung wieder in Gang gesetzt.
Zitat NASA's Exploration Ground Systems @NASAGroundSys Weather currently 'go'. Approx. 30 mins has been added to the countdown to adjust loading operations from the previous launch attempts (team is planning to load slower and at lower pressure today). Poll for 'go' of cryo is taking place right now as the pad is cleared. 1:15 PM · Sep 21, 2022·Twitter Web App
Artemis I launch director Charlie Blackwell-Thompson has given the 'go' to begin tanking for today's cryogenic propellant tanking test. 1:30 PM · Sep 21, 2022·Twitter Web App
Teams have fired up the circulation pumps, activated heaters, configured liquid oxygen and liquid hydrogen valves for loading, and activated the ground launch sequencer, the computer that tracks potential violations. 1:43 PM · Sep 21, 2022·Twitter Web App
Core stage liquid oxygen transfer chill down has started, a 15-minute operation to chill down the lines that run from the cryo sphere. This thermal conditioning will reduce the shock to the system as they get ready to flow into the rocket. 2:07 PM · Sep 21, 2022·Twitter Web App
Chill down of the liquid oxygen lines is complete and chill down of the main propulsion system is underway. 2:19 PM · Sep 21, 2022·Twitter Web App
5% full on liquid oxygen, still in slow fill. 2:57 PM · Sep 21, 2022·Twitter Web App
We are now in liquid oxygen fast fill and have started liquid hydrogen slow fill. Both propellants are now flowing into the @NASA_SLS rocket. 3:11 PM · Sep 21, 2022·Twitter Web App
We are now at 32% full on liquid oxygen. Fast fill of liquid hydrogen is expected soon. Teams are intentionally flowing a bit slower today for this Artemis I cryogenic demonstration test. 3:58 PM · Sep 21, 2022·Twitter Web App
Zitat Chris G - NSF @ChrisG_NSF There is a hydrogen leak. 7%. Above 4% safety limit. Same Quick Disconnect "line area".
"Same indication from leak on Sept. 3 launch attempt." NASA Derrol. So that doesn't sound good. Launch Director preplan is to stop, heat up line, reintroduce cryo, and see if that works. It did NOT work on Sept. 3. Leka indication "the same" today. 4:08 PM · Sep 21, 2022 ·Twitter Web App
Zitat 09/21/2022 17:40 Stephen Clark NASA's launch team has resumed the flow of liquid hydrogen into the core stage of the Artemis 1 moon rocket. This step follows troubleshooting to allow the hydrogen line to warm up before resuming the fuel load at lower pressure in hopes of re-seating a leaky seal.
09/21/2022 17:54 With the liquid hydrogen now in "fast fill" mode onto the SLS core stage, a small leak remains in the quick-disconnect fitting, but the hydrogen concentration there is now measured at 0.5%, below the 4% allowable limit. Earlier this morning, it was 7%.
09/21/2022 17:59 Liquid oxygen on the core stage is currently at 94% full, and liquid hydrogen as 28% full.
Zitat Andrew @Cosmic_Andrew1 Large leak the first go of it and then NASA decided to just collect data on it and the seal decides it’ll work now…. 7% LH2 concentration leak this morning vs .5% now 5:59 PM · Sep 21, 2022·Twitter Web App
Zitat Eric Berger @SciGuySpace Also: In the cavity where the line goes into the rocket, there is a limit of a 4 percent concentration of ambient hydrogen for safety reasons. However, engineers want to raise that limit temporarily to 10 percent to see what happens to the leak. Stay tuned?
So far, so good as the liquid hydrogen tank is now 25 percent full. 5:49 PM · Sep 21, 2022·TweetDeck
Zitat von Spaceflight Now09/21/2022 18:09 NASA's launch team is about to proceed into the next step of today's tanking test countdown -- the main engine kick-start bleed. This will begin chilling the RS-25 engines. This step has caused issues during previous SLS countdowns. Engineers continue managing a small hydrogen leak, with concentrations still below 1%. The allowable limit is 4%.
09/21/2022 18:20 The engine kick-start bleed procedure is complete, and its transitioning to a vented bleed configuration. Liquid hydrogen loading continues on the core stage. During the engine kick-start, an increase pressure caused the hydrogen concentrations to reach as high as 3.4%, more than observed earlier in the filling process, but still below the 4% allowable limit.
18:22. Core Stage: liquid oxygen: 100%, liquid hydrogen: 47%. (18:25: 50%; 18:30: 55%) (Anders ausgedrückt: die pumpen da pro Minute 15.000 Liter flüssigen Wasserstoff rein, mit einer Temperatur von -253°C.)
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
19:16. Core Stage vollständig betankt. Vorbereitung auf die Betankung der 2. Stufe.
Das Leck am QD, dem "Quick Disconnect," der Verbindung, an der die Wasserstoffleitung mit 20 cm Durchmesser ans SLS andockt, besteht weiterhin; bei der Druckerhöhung hat sich die Leckage des austretenden H2 von knapp 5% auf 0,5% Anteil der Umgebungsluft reduziert, liegt also im grünen Bereich. Am 3. September war das bei Druckerhöhung gestiegen.
Zitat Spaceflight Now @SpaceflightNow The liquid hydrogen and liquid oxygen tanks on the SLS core stage are now full and in replenish mode. Next up will be cryogenic tanking of the SLS moon rocket's upper stage. NASA says the hydrogen leak at the tail service mast umbilical is "manageable." 7:38 PM · Sep 21, 2022 ·TweetDeck
Zitat Spaceflight Now @SpaceflightNow NASA confirms liquid hydrogen and liquid oxygen loading has started on the upper stage of the Artemis 1 moon rocket. This upper stage, manufactured by United Launch Alliance, will contain 22,000 gallons of propellants when fully loaded. 8:14 PM · Sep 21, 2022·TweetDeck
Zitat Eric Berger @SciGuySpace Based on their timeline, with about 20 minutes to go loading propellant onto the SLS rocket upper stage, it looks like NASA is nearly three hours behind. It's a good thing they're not trying to hit a launch window today. 8:37 PM · Sep 21, 2022·TweetDeck
Zitat von Spaceflight Now09/21/2022 21:13 The countdown clock is holding at T-minus 10 minutes. The clock will remain in this pre-planned hold for the remainder of today's tanking test.
21:28 Liquid hydrogen tank on the upper stage is in replenish mode. 21:33 Flight director has given "Go" to liquid hydrogen pre-press test for the core stage. 21:46 Liquid oxygen in the upper stage is in replenish mode now.
Zitat Michael Baylor @nextspaceflight And the umbilical plate LH2 leak is back and out of acceptable levels. If it does not go down soon, they will have to stop. 9:46 PM · Sep 21, 2022 ·Twitter Web App
21:50: Pressure test complete. LH2 leak was in the 4% range & stable. (22:02: Correction: first leak was on the 8-inch feed; this new leak was on the 4-inch bleed line.)
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
4-zöllige Bleed Line: es handelt sich hier um die Ableitung für den flüssigen Wasserstoff, mit dem die Brennkammern vor dem und während des Starts gekühlt werden. Der gemessene Wert ist kurzzeitig auf knapp über 5% gestiegen und dann ohne weitere Eingriffe der Flugleitung wieder abgeflalen.
22:34: Entscheidung des Teams der Flugleitung: alle gesetzten Testziele für den heutigen Test erfüllt.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
NASA said it completed all the objectives of a Space Launch System tanking test Sept. 21 despite the reoccurrence of liquid hydrogen leaks.
The day-long test at Kennedy Space Center’s Launch Complex 39B involved filling the SLS core stage and upper stage with liquid hydrogen and liquid oxygen propellants, carrying out the “kickstart bleed” of liquid hydrogen into the core stage engines and a “pre-press” test of the liquid hydrogen tank. The test was designed to confirm that changes such as replacement of seals and a new loading procedure would prevent hydrogen leaks seen in the previous launch attempt Sept. 3.
Early in the test, though, controllers reported a liquid hydrogen leak in the tail service mast umbilical, where liquid hydrogen is transferred from ground systems to the core stage, that exceeded limits and temporarily stopped loading. Warming the connection of the umbilical to the core stage then cooling it appeared to work, with the leak falling well below the limit of 4% concentration of hydrogen but not completely going away.
Another hydrogen leak took place during the pre-press test on a second, smaller liquid hydrogen line, with concentrations as high as 5%. Engineers continued the test and the leak diminished over time.
NASA said at the conclusion of the test that they met all of their objectives but stopped short of declaring they were ready to proceed with a launch at the next opportunity, Sept. 27.
“I think the test went really well,” said Charlie Blackwell-Thompson, NASA Artemis 1 launch director, during a NASA TV interview shortly after the end of the tanking test. “All of the objectives that we set out to do we were able to accomplish today.”
She said, though, it was premature to declare the vehicle ready for another launch attempt. “I think we’ll take the data and we’ll go see what it tells us,” she said. “I don’t like to get ahead of the data, and so I’d like the team to have the opportunity to go look at it to see if there are changes we need to make to our loading procedure, our timelines, or if we’re good as is.”
Die beiden bestehenden Unsicherheitsfaktoren sind die hier:
Zitat The tanking test is not the only factor influencing a launch decision. NASA is still working with the Eastern Range to secure a waiver for the SLS flight termination system, whose certification expired at the end of the previous launch period in early September. The U.S. Space Force, which operates the range, was not expected to decide on a waiver until after the tanking test.
Tropical weather could also play a factor. A system currently called Invest 98L is forming the Caribbean that is forecast to become a tropical storm within the next few days and could head towards Florida, based on current long-range weather models. That would require NASA to at least consider rolling back the SLS to the Vehicle Assembly Building.
Jeremy Parsons, deputy manager of NASA’s Exploration Ground Systems program, said at a Sept. 19 briefing that it would take about three days to get the vehicle back in the VAB.
Da ich auch zu denen gehöre, die gestern zum allerersten Mal die Formulierung "Invest" in diesem Zusammenhang gehört haben:
Zitat If you’ve been keeping up with the tropics this week, you’ve probably heard the term “Invest 98L” at some point when hearing about the tropical wave we’re watching in the Atlantic Ocean. If you’re not familiar with what the term means, here’s a few notes to catch you up to speed.
Right off the bat, the term “invest” is nothing new. It’s been used for years in weather circles to point out areas on the tropical weather map that require closer examination. The term “invest” is essentially just a shorter way of saying “area of investigation”.
The number attached to the term helps keep order. Invest areas are numbered from 90 to 99, and once you hit 99 the list starts over at the start at 90. Our current tropical wave to watch is Invest 98L, as it’s the 9th time this year an invest area has been monitored. Whenever the next area of interest comes along, it would be called Invest 99L. After that, the order would go back and start over at Invest 90L.
The letter that follows the number in the term “Invest 98L” is to classify which ocean we’re talking about. Areas to watch in the Atlantic Ocean use the letter “L”. Areas to watch in the western Pacific Ocean use “W”. Regions of concern in the eastern Pacific use “E”, while in the central Pacific the letter “C” is used.
Zitat Jeff Foust @jeff_foust NASA will hold a briefing Friday at 12:30 pm EDT to provide an update on yesterday’s SLS tanking test and plans for the Artemis 1 mission. 11:01 PM · Sep 22, 2022·Tweetbot for Mac
Zitat Eric Berger And just now, NASA says it will provide an update on the Artemis I mission on Friday at 12:30pm ET. "Based on data from the test, teams are fine-tuning procedures for the next launch opportunity, targeted for no earlier than Sept. 27." 10:54 PM · Sep 22, 2022·TweetDeck
Zitat Eric Berger @SciGuySpace This afternoon's European ensemble forecast offers more concern for potential tropical impacts to Artemis I. This map shows "low" locations for 8 am Tuesday, the 27th. Still mucho uncertainty, but confidence in track will increase now that a center of circulation is forming.
Reminder that the SLS ground systems program needs at least three days to prepare the rocket for a rollback to the VAB, so it probably would need to make that decision on Friday or Saturday at the latest. No word from NASA yet on when the plan to provide a launch attempt update. 10:23 PM · Sep 22, 2022·TweetDeck
Update zum Wetter. Das sich formierende Tiefdruckgebiet "Invest98L" läuft jetzt unter "Tropical Depression Nine."
Zitat Eric Berger@SciGuySpace Weather continues to be a concern for NASA and Artemis I with the newly formed Tropical Depression Nine. Earliest arrival of Tropical Storm-force winds over Kennedy Space Center is now Monday night or Tuesday morning. 12:12 PM · Sep 23, 2022·TweetDeck
Zitat Mike's Weather Page@tropicalupdate Latest Thursday overnight 00z spaghetti models for Invest 98. Looking like the eastern Gulf & FL confidence growing even more. Timing could bring effects as soon as Mon later into Tue for SFL if the latest EURO/CMC/ICON runs head that way. Lots to watch. http://spaghettimodels.com 3:27 AM · Sep 23, 2022·Twitter Web App
Zitat Eric Berger @SciGuySpace Regardless, the forecast for Sept. 27 at KSC is quite poor w/high rain chances. Maybe they wait a day on making a final decision to roll back to the VAB (to possibly hit 10/2). But going inside does seem the prudent choice at this point. Not worth risking your $4 billion mission.
The other point that Charlie Blackwell-Thompson and other NASA officials have made is that, while rollback does take three days, leaving it to the last minute would leave employees no time to prepare for a potential storm themselves. 1:44 PM · Sep 23, 2022·TweetDeck
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Bitte beachten Sie diese Forumsregeln: Beiträge, die persönliche Angriffe gegen andere Poster, Unhöflichkeiten oder vulgäre Ausdrücke enthalten, sind nicht erlaubt; ebensowenig Beiträge mit rassistischem, fremdenfeindlichem oder obszönem Inhalt und Äußerungen gegen den demokratischen Rechtsstaat sowie Beiträge, die gegen gesetzliche Bestimmungen verstoßen. Hierzu gehört auch das Verbot von Vollzitaten, wie es durch die aktuelle Rechtsprechung festgelegt ist. Erlaubt ist lediglich das Zitieren weniger Sätze oder kurzer Absätze aus einem durch Copyright geschützten Dokument; und dies nur dann, wenn diese Zitate in einen argumentativen Kontext eingebunden sind. Bilder und Texte dürfen nur hochgeladen werden, wenn sie copyrightfrei sind oder das Copyright bei dem Mitglied liegt, das sie hochlädt. Bitte geben Sie das bei dem hochgeladenen Bild oder Text an. Links können zu einzelnen Artikeln, Abbildungen oder Beiträgen gesetzt werden, aber nicht zur Homepage von Foren, Zeitschriften usw. Bei einem Verstoß wird der betreffende Beitrag gelöscht oder redigiert. Bei einem massiven oder bei wiederholtem Verstoß endet die Mitgliedschaft. Eigene Beiträge dürfen nachträglich in Bezug auf Tippfehler oder stilistisch überarbeitet, aber nicht in ihrer Substanz verändert oder gelöscht werden. Nachträgliche Zusätze, die über derartige orthographische oder stilistische Korrekturen hinausgehen, müssen durch "Edit", "Nachtrag" o.ä. gekennzeichnet werden. Ferner gehört das Einverständnis mit der hier dargelegten Datenschutzerklärung zu den Forumsregeln.
Sie sind vermutlich noch nicht im Forum angemeldet - Klicken Sie hier um sich kostenlos anzumelden
Offline
