Nach dem Ausklappen der beiden Paletten für das Sonnensegel, die den "Kiel" des JWST bilden, gibt es jetzt auf dem Dashboard der NASA Temperaturangaben - für 4 Meßpunkte. Umschalten zwischen Fahrenheit/Celsius erfolgt wie für Meilen <=> Kilometer durch Klick auf English <> Metric.
Zitat Temperature data is now available!
Temperature control is a vital aspect of Webb's design, engineering and operations. Of the many temperature monitoring points on the observatory, this page displays 2 "hot side" and 2 "cold side" temperatures that are a good indication of overall temperature status and trends.
The temperatures displayed on the hot side of the observatory are located on the sunshield structure and spacecraft bus. . The temperatures displayed on the cold side of the observatory are located on the primary mirror and instrument (ISIM) module radiator. You can read more about the observatory and its subsystems on this page. They are labelled with the following letters on the display (note: these labels will pop up if you hover your mouse over the display):
a) Sunshield UPS Average Temperature (hot side: Sunshield Structure) b) Spacecraft Equipment Panel Average Temperature (hot side: Spacecraft Bus) c) Primary Mirror Average Temperature (cold side: Mirrors) d) Instrument Radiator Temperature (cold side: ISIM)
There are many more temperature sensors on the observatory that our engineers monitor throughout the deployment, commissioning and operations processes. The data points shown here give a good overall indication of the temperature trends on each side of the sunshield as we move through deployment and commissioning. They illustrate the great contrast between the hot and cold sides of the spacecraft and the incredible engineering and effectiveness of the sunshield. These temperature observations are reported daily from actual spacecraft telemetry data. Temperature values will continue to be reported in the months that follow the completed deployment as the spacecraft cools to operational values.
Units
By default the page loads and displays distances in miles, temperatures in Fahrenheit, ie English/US units (also known as Imperial or USCS system units). If you wish to have the page load and display in kilometers and temperatures in Celsius, ie metric system units use the urls below to select your preferred units. We do not use cookies; these urls 'store' your units preference. Once chosen, bookmark the urls with your preferred units and use it instead of the default website link. NOTE: the page units toggle button English<>Metric now reloads the page with these urls.
(c) ist die Temperatur der Hauptspiegels (-57,55°C), (d) die des Meßinstrumentenpakets (ISIM; -153,33°C). Die Betriebstemperatur wird im Lauf der nächsten Monate auf -233°C abgesenkt.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Thermische Trennung zwischen Teleskop und dem Unterbau. Ist auch nötig, um Platz für die Entfaltung der Sonnenschirm-Folien zu schaffen.
Zitat The Deployable Tower Assembly (DTA) is deployed. The tower will extend about 2 meters. This movement/distance provides needed separation between the spacecraft and telescope to allow for better thermal isolation and to allow room for the sunshield membranes to unfold. Prior to this, several release devices will have been activated, and various heaters, software, and electronics have been configured to support deployments. This deployment motion is driven by a motor.
Our team has just confirmed that we have successfully extended our Deployable Tower Assembly (DTA) upwards, making space for our sunshield deployments in the next few days -- another step completed as we #UnfoldTheUniverse: https://blogs.nasa.gov/webb/2021/12/29/w...tends-in-space/ Artist illustration the James Webb Space Telescope amidst a starry space background, having just completed its deployable tower assembly deployment.
Zitat von December 30, 2021Webb Team Releases Sunshield Covers
Webb’s engineers have released and rolled up the sunshield covers that protected the thin layers of Webb’s sunshield during launch. After the team electrically activated release devices to release the covers, they executed commands to roll the covers up into a holding position, exposing Webb’s sunshield membranes to space for the first time.
The deployment, which took about an hour, concluded at approximately 12:27 p.m. EST.
In their next stages of planned activities, engineers will deploy the sunshield mid-booms, before proceeding with sunshield tensioning. The steps in this process, controlled by humans at Webb’s Mission Operations Center, may change.
Der kleine Übersetzer ist herausgefordert. Wie würde man in diesem Fall "Flap" am adäquatesten im Deutschen wiedergeben? Blatt? Klappe? Abschattung?
Zitat Earlier in the day, Webb deployed a momentum tab on the back side of the observatory. The eight-minute process involved releasing the flap’s hold-down devices, then a spring moved the flag into its final position, according to NASA.
The flap will help keep Webb stable against the bombardment of solar photons, or light energy, from the sun throughout the observatory’s astronomy mission. The mission’s giant sunshield, once deployed, will catch the solar photons like a kite moves with the wind, but with more subtle effects.
Without the aft momentum flag, the influence of the sun would require Webb’s six reaction wheels to counteract the movement to keep the telescope properly pointed. In turn, Webb would need to fire its thrusters and consume fuel more often to offload momentum from the reaction wheels.
Es handelt sich um ein Panel mit jetzt zwei ausgeklappten Seitenflügeln, außen verspiegelt, das dafür sorgt, daß weniger Sonnenlicht auf den ausgefalteten Schutzschirm fällt, um den Lichtdruck zu vermindern. Dafür ist das Ding aber ziemlich klein ausgelegt. Ich nehme mal an, daß es steuerbar ist, und somit die im Schatten liegende Fläche entsprechend austarieren kann. Das geht aber aus dem Text nicht hervor.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
In der Fliegerei sind die Flaps die Landeklappen am hinteren Teil der Tragflächen, ganz allgemein gesprochen. Da das JWST im weitesten Sinne ja auch so was wie ein Flugdingens ist, würde ich 'Klappe' als adäquate Übersetzung hernehmen.
Gruß Morn <>< ______________________________________ First we take Manhattan, then we take Berlin 1987, L. Cohen
Zitat von January 1, 2022Flying outbound from Earth at a distance of more than 400,000 miles, the James Webb Space Telescope extended one of two booms Friday to begin unfurling the mission’s five-layer sunshield. With the port-side boom deployed, work is underway tonight to extend another boom on the starboard side.
The critical deployments mark some of the most nail-biting moments to ready the nearly $10 billion observatory for science operations, following its successful launch Dec. 25 aboard a European Ariane 5 rocket.
NASA confirmed the successful extension of the port-side mid-boom in an update shortly after 7 p.m. EST Friday (0000 GMT Saturday).
Webb’s two sunshield mid-booms are designed to pull out the shade’s five membranes into their distinctive diamond shape.
Ground teams started extending the two sunshield booms several hours later than originally scheduled, NASA said in an update Friday evening. The space agency said mission controllers at the Space Telescope Science Institute took extra steps to confirm that a sunshield cover had fully rolled up before proceeding with the first mid-boom deployment.
“Switches that should have indicated that the cover rolled up did not trigger when they were supposed to,” NASA said. “However, secondary and tertiary sources offered confirmation that it had. Temperature data seemed to show that the sunshield cover unrolled to block sunlight from a sensor, and gyroscope sensors indicated motion consistent with the sunshield cover release devices being activated.”
The covers were opened and rolled back to expose the sunshield to space Thursday.
Five telescoping segments of the port, or left-side, mid-boom began extending around 1:30 p.m. EST (1830 GMT) Friday. The motor-driven boom reached full deployment at 4:49 p.m. EST (2149 GMT), NASA said.
Officials have repeatedly said Webb’s deployment schedule could change based on real-time conditions.
Managers decided Friday evening to move forward with extending the starboard mid-boom, and initial steps for that deployment began shortly after 7 p.m. EST (0000 GMT), NASA said.
Anscheinend hat es da Anfragen zu der schleppenden Rückmeldung an die Öffentlichkeit gegeben. Die NASA verspricht etwas mehr Tempo.
Zitat Update: NASA Plans Coverage of Webb Space Telescope Deployments
Editor’s Note: This advisory was updated Dec. 30 to reflect the addition of a media teleconference after Webb’s sunshield is fully deployed, no earlier than Sunday, Jan. 2.
Over about the next two weeks, NASA will provide broadcast coverage, media briefings, and other updates on major deployment milestones for the James Webb Space Telescope, the world’s largest and most powerful space science telescope.
Broadcasts of milestone events will air live on NASA TV, the NASA app, and the agency’s website.
Webb, an international partnership with the ESA (European Space Agency) and the Canadian Space Agency, launched Dec. 25 from Europe’s Spaceport in Kourou, French Guiana. The observatory had been folded up, origami style, to fit inside an Arianespace Ariane 5 rocket for launch. Webb is now in the complex and intricate process of unfolding in space, as it travels nearly 1 million miles to its destination, the second Lagrange point or L2.
Webb’s deployment sequence is a human-controlled process that provides the team with the flexibility to pause, assess data, and adjust as needed. The timing and order of all milestones may therefore change. NASA will host live broadcast coverage to mark the following milestones, with specific times and dates updated as they approach:
Sunshield tensioning: The full deployment of the sunshield, the most challenging element for Webb, will mark a critical milestone for the mission. This step is scheduled for completion about eight days after launch, no earlier than Sunday, Jan. 2. Secondary mirror support structure deployment: The support structure that holds the secondary mirror in position to focus light collected by the primary mirror is set for deployment about 10 days after launch, no earlier than Tuesday, Jan. 4. Webb deployments complete: With the unfolding of the second of Webb’s primary mirror wings, the Webb team will have completed all observatory deployments. This is scheduled to take place about 13 days after launch, no earlier than Friday, Jan. 7.
NASA provides regular updates on the Webb telescope blog. The public can also follow Webb’s deployments online via a “Where is Webb?” interactive tracker and a Deployments Explorer.
NASA Press Briefings
NASA will hold the following media briefings after major deployment milestones:
A media teleconference as soon as possible after the end of the live broadcast coverage of Webb’s sunshield tensioning, no earlier than Sunday, Jan. 2. To participate by telephone, media must RSVP no later than noon EST Sunday, Jan. 2, to Laura Betz at: laura.e.betz@nasa.gov. A media briefing as soon as possible after the end of the live broadcast coverage of Webb’s final deployments, no earlier than Friday, Jan. 7.
The agency will determine the timing of these briefings as the deployment milestones approach and will stream the events live on its website.
JWST (1/2): New Year's Day Webb update from NASA: Because sunshade boom deploy went late into the day Friday, mission managers decided today to delay the start of membrane tensioning to Sunday "to allow the team to rest" before pressing ahead
JWST (2/2): Tensioning to tighten and separate the sunshade's five layers is still expected to take at least two days and likely will affect the timing of downstream events as well
Zitat Deployment Timeline Adjusted as Team Focuses on Observatory Operations
Taking advantage of its flexible commissioning schedule, the Webb team has decided to focus today on optimizing Webb’s power systems while learning more about how the observatory behaves in space. As a result, the Webb mission operations team has moved the beginning of sunshield tensioning activities to no earlier than tomorrow, Monday, Jan. 3. This will ensure Webb is in prime condition to begin the next major deployment step in its unfolding process.
Specifically, the team is analyzing how the power subsystem is operating now that several of the major deployments have been completed. Simultaneously, the deployments team is working to make sure motors that are key to the tensioning process are at the optimal temperatures prior to beginning that operation.
Webb’s deployment was designed so that the team could pause deployments if necessary. In this case, Ochs said, they are relying on that flexibility in order to properly address how the massive and complex observatory is responding to the environment of space.
The timeline for deployments and NASA coverage will be updated as major deployments resume.
Zitat von January 3, 2022Webb Team Moving Forward With Sunshield Tensioning
The Webb mission operations team began the first steps in the process of tensioning the first layer of Webb’s sunshield this morning around 10 a.m. EST.
It will take the team two to three days to tension the five-layer sunshield. The plan for today is to focus on the first layer, the largest and the one closest to the Sun.
This critical step in the observatory’s complex sequence of deployments resumed after Webb mission managers paused deployment operations on Saturday to allow for team rest, and then again on Sunday to make adjustments to Webb’s power subsystem and to alter the observatory’s attitude to lower the temperature of the motors that drive the tensioning process.
NASA’s Webb project manager Bill Ochs, Northrop Grumman’s vehicle engineering lead Amy Lo, and NASA’s Webb program director Greg Robinson provided more information about Webb’s first week in space and upcoming deployments in this teleconference held earlier today.
Screen still of the James Webb Space Telescope's sunshield halfway through sunshield tensioning. Two of its five silver, reflective sunshield layers have been pulled taut.
Zitat Live coverage: Final tensioning of Webb telescope’s sunshield underway
01/04/2022 15:37 Stephen Clark Stephen Clark
NASA TV is providing live coverage of the final steps of tensioning the Webb telescope's sunshade. You can watch the coverage on this page.
01/04/2022 15:54 Stephen Clark Stephen Clark
Keith Parrish, Webb's commissioning manager at NASA, says the outermost, and largest, three layers of the sunshield were tensioned yesterday. The complexity of tensioning each layer is reduced as ground teams march through the procedures, with the first layer requiring 90 cables to pull taut, and the smallest, final, and innermost layer using just 18 cables.
01/04/2022 16:35 Stephen Clark Stephen Clark
Mission control confirms that the fourth layer of the Webb telescope’s sunshield has been fully tensioned. Next up is tensioning the fifth and final layer.
Wenn man auf YouTube schaltet, kann man links oben den Status gemäß der Telemetriedaten des Teleskops verfolgen.
Es bleiben noch 18 Kabel strammzuziehen; An den Querstreben ist die fünfte Folie straff gespannt, zurzeit werden die Kabel an der Bugsektion straffgezogen; als letztes folgt das Heck.
17:38. Meldung: Bugsektion voll aufgespannt.
An der Zeitmarke links unten kann man sehen, daß die Übertragung 40 Sekunden zeitverzögert rausgeht.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Die 18 Segmente des Hauptspiegels bestehen aus Beryllium, das aufgrund seines minimalen Wärmeausdehnungskoeffizienten gewählt wurde. Die korrekte Oberflächenkrümmung zur Fokussierung des Lichts wird trotzdem erst bei der vorgesehenen Betriebstemperatur von 40° Kelvin erreicht, etwa am Tag 90 der Mission, 2 Monate nach Erreichen von L2. Die Goldbedampfung der Hauptspiegelsegmente hat eine Masse von 4 Gramm.
Der Ausgleich des Lichtdrucks, der auf den Sonnenschirm ausgeübt wird, erfolgt durch sechs "rotationslose" Gyroskope. Gelegentlich muß die Abwichung zusätzlich durch den Einsatz des Bordtriebwerks korrigiert werden. Der Treibstoffvorrat ist der einzige Faktor, der die Betriebsdauer des Teleskops begrenzt. Der Vorrat ist für eine Einsatzdauer von 10 Jahren bei ungünstigsten Voraussetzungen ausgelegt (Abweichung vom vorgesheen Korridor beim Start, Problem beim Positionieren der einzelnen Komponenten), und der bisherige Bilderbuchablauf dürfte für eine wesentlich längere Betriebsdauer sorgen.
Die Beobachtungsszeiten am Teleskop werden durch mehrere Kommissionen zugewiesen, von der ESA und der kanadischen Raumfahrtagentur CSA hoch zur NASA. Die gewonnenen Daten werden für die Anstragsteller zur Sicherung der Priorität bei der Publikation der Arbeiten erst einmal proprietär vorgehalten und nach Ablauf einer Frist in ein Archiv eingestellt, wo sie für jedermann mit einem Netzzugang abrufbar sind.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
___________________ Jeder, der Merkel stützt, schützt oder wählt, macht sich mitschuldig. “Die gefährlichsten Unwahrheiten sind Wahrheiten mäßig entstellt”, Georg Cristof Lichtenberg "Warum halten sie Begriffe wie 'Zigeunersoße' für rassistisch, aber 'Schei** Juden' für harmlos?", Hamed Abdel-Samad
Note: We will have LIVE coverage of the secondary mirror deployment on http://nasa.gov/live starting at approximately 9:45 a.m. EST (subject to change based on Webb’s operations). nasa.gov
January 7, Friday TBD - Live coverage of the unfolding of the second of the James Webb Space Telescope's primary mirror wings, marking the end of the observatory deployments. The time of the broadcast will be posted here and the James Webb Space Telescope's blog when it is announced. TBD - NASA will hold a media briefing as soon as possible after the end of the live broadcast coverage of Webb’s final deployments. The time of the press conference will be posted here and the James Webb Space Telescope's blog when it is announced.
Zitat NASA @NASA Watch live coverage starting at ~10:20am ET (15:20 UTC) from @NASAWebb mission control as teams deploy its tripod-like secondary mirror structure. The mirror will help reflect light to #UnfoldTheUniverse: https://youtu.be/-EnlaXnFcGs
Have questions? Drop them below.
The James Webb Space Telescope shown in a clean room with its secondary mirror, a tripod-like structure, extended out in front of it's unfolded primary mirror.
Der Sekundärspiegel besteht ebenfalls aus Beryllium, hat einen Durchmesser von 74 cm und ist ebenfalls goldbedampft. Wie bei allen Spiegelteleskopen ist der Sekundärspiegel konvex. Die drei Streben, die ihn vor dem Hauptspiegel positionieren, sind gut 7,5 m (25 Fuß) lang und sind hohle Röhren aus einem Verbundwerkstoff mit einer Wandstärke von gut einem Millimeter. Die obere Strebe besteht aus zwei Segmenten, die über ein Gelenk verbunden sind. Beim Ausklappvorgang wird diese eingeklappte Strebe gestreckt.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
17:08 (MEZ): alle Fixier-Pins, die die ganze Struktur während des Starts gegen die Virbationen fixiert haben, sind freigesprengt. 17:10 Probebewegung zum Testen der beiden Motoren beendet. 17:18 Ausfaltvorgang hat begonnen. Das dauert etwa 11 Minuten. Gut zu sehen, wie sich das in der Animation links im Bild bewegt. Die Graphik ist an den eingehenden Telemetriedaten orientiert. 17:27 Sekundärspiegel positioniert. 17:30 Arretierungsvorgang hat begonnen. Die volle Arretierung benötigt 45 Minuten. 17:55 MOC - Mission Operation Center - gibt bekannt: Arretierungvorgang beendet.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
We'll have live coverage on social media and NASA TV as Webb deploys its second and final primary mirror wing, with our broadcast beginning no earlier than 9am ET (14:00 UTC) Sat., Jan. 8: https://go.nasa.gov/3eZLxRy
11:20 PM · Jan 6, 2022·Sprinklr
Avonord @Avonord · 1h Replying to @NASA and @NASAWebb Second primary mirror wing on Saturday. So, the first primary mirror wing tomorrow?
NASA @NASA Replying to @Avonord and @NASAWebb That's right! The second deployment will mirror the first one. Smiling face with sunglasses
Zitat von January 7, 2022First of Two Primary Mirror Wings Unfolds
Webb’s iconic primary mirror is taking its final shape. Today, the first of two primary mirror wings, or side panels, was deployed and latched successfully. Each side panel holds three primary mirror segments that were engineered to fold back to reduce Webb’s overall profile for flight.
The process of deploying the port side mirror wing began at approximately 8:36 a.m. EST. At approximately 2:11 p.m. EST, engineers confirmed that the panel was fully secured and locked into place, and the deployment was complete.
Now that the port side wing panel is locked in place, ground teams will prepare to deploy and latch the starboard (right side) panel tomorrow. Upon completion, Webb will have concluded its major deployment sequence.
Zitat von January 8, 2022Starboard Primary Mirror Wing Deployment Underway
The Webb mission operations team has given the ‘go-ahead’ to move forward with the extension of its starboard primary mirror panel. This is the last of the major deployments on the observatory, and its completion will set the stage for the remaining five and a half months of commissioning, which consist of settling into stable operating temperature, aligning the mirrors, and calibrating the science instruments.
Live coverage of the deployment, from the Webb Mission Operations Center at the Space Telescope Science Institute in Baltimore, will stream on nasa.gov/live starting no earlier than 9 a.m. EST.
(All times Eastern U.S. time, which equates to UTC-5.)
No earlier than 9 a.m. - Live coverage of the unfolding of the second of the James Webb Space Telescope's primary mirror wings, marking the end of the observatory deployments. No earlier than 1:30 p.m. - NASA will hold a media briefing as soon as possible after the end of the live broadcast coverage of Webb’s final deployments.
Zitat January 14, Friday 9:35 a.m. – ISS Expedition 66 in-flight event for ESA (European Space Agency) with the Children’s Chain Educational Group and ESA astronaut Matthias Maurer
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
15:53. Im Kommentar hieß gerade "..folded up like origami..."
16:18: Nach Motorprobe Start. 16:26: Zu 2/3 ausgeschwenkt. 16:28. Ausgeklappt. Die Arrentierung wird einige Stunden dauern.
Zitat NASA Webb Telescope @NASAWebb The final wing is now deployed! Before we celebrate, we’ve still got work to do. The team is working hard at @SpaceTelescope to latch the wing into place, a multi-hour process. When the final latch is secure, #NASAWebb will be fully unfolded in space. #UnfoldTheUniverse
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