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Johanes Offline




Beiträge: 2.415

08.01.2022 17:23
#51 Und hier...? Antworten

"Ein im Internet veröffentlichtes Bekennerschreiben zum Brandanschlag auf ein Gebäude des Bremer Raumfahrtkonzerns OHB ist nach Einschätzung der Ermittler echt."
Quelle dafür: Polizei richtet nach Anschlag "Soko Linksextremismus" ein (6. Januar 2022, 15:34 Uhr)

Ehrlich gesagt: Keine Ahnung, ob OHB eine tiefere Zusammenarbeit mit den Militär hat. Wer weiß, was die Linksextremen da wissen oder zu wissen glauben.
Angeblich sollen da Scheiben mit Hämmern eingeschlagen und anschließend Büroräume angezündet worden sein.
AFAIK war die Begründung der Extremisten, dass die Firm OHB auch Aufträge von der Bundeswehr entgegen genommen habe.
Das ist alles, die vollständige Begründung.




Ich möchte natürlich nicht in Abrede stellen, dass Satelliten auch zu militärischen Zwecken eingesetztn werden können und meiner bescheidenen Einschätzung nach auch eingesetzt werden.
Für mich deckt sich das mit einer von mir schon länger beobachteten Linie. Deutschland entfernt und distanziert sich immer mehr von Hoch-Technologie und Fortschritt. Das Signal, welches man damit an die andere Konzerne sendet, ist klar.

Klar, dass wir von diesem "Ereignis regionalen Interesses" nichts erfahren. Ich gehe aber davon aus, dass man sich in größeren konerzen in entsprechender Ebene schon über solche Dinge austauschen wird.

Schönen Gruß

Johanes.



"Alles nun, was ihr wollt, daß euch die Leute tun sollen, das tut ihr ihnen auch. Das ist das Gesetz und die Propheten." (Matthäus 7,12)
"Das andre ist dies: »Du sollst deinen Nächsten lieben wie dich selbst« (3. Mose 19,18). Es ist kein anderes Gebot größer als diese." (Mark. 12,31)

Ulrich Elkmann Offline




Beiträge: 13.554

08.01.2022 17:52
#52 RE: Und hier...? Antworten

Geht um dieses Projekt.

Zitat
11. November 2020 Pressemitteilung
OHB erhält Auftrag zur Regeneration von Bundeswehr-Bodenstationen

Bremen, 11. November 2020. Die OHB Digital Connect GmbH, ein Tochterunternehmen des Raumfahrtkonzerns OHB SE, hat jetzt durch das Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr (BAAINBw) einen Auftrag zur Regeneration von mobilen Bodenstationen für das Satellitenkommunikationssystem der Bundeswehr (SATCOMBw) erhalten.

Step by step

Damit Videodateien, Sprachdaten oder andere Daten von verschiedenen Einsatzorten übertragen werden können, nutzt die Bundeswehr verlegefähige Bodenstationen des Systems SATCOMBw in unterschiedlichen Varianten. In 36.000 Kilometern Höhe befinden sich die zum System gehörenden Satelliten COMSATBw-1 und COMSATBw-2 auf einer geostationären Umlaufbahn. Die mobilen Bodenstationen sowie weitere Ausbildungs- und Simulationsanlagen werden nun schrittweise am Mainzer OHB-Standort mit einem System- und Hardwareupdate versehen. „Zunächst werden wir einen Prototypen regenerieren, testen und verifizieren, danach gehen wir in das Seriengeschäft und starten die Regeneration der Bodenstationen“, sagt der verantwortliche OHB-Systemingenieur Dr. Christian Blohm.

Langjähriger Partner der Bundeswehr

OHB unterhält seit Jahren Geschäftsbeziehungen mit der Bundewehr. Mit dem System SAR-Lupe hat OHB den deutschen Streitkräften 2007 das erste eigene satellitengestützte Aufklärungssystem geliefert. Seit Mitte 2013 arbeitet die OHB System AG an der Entwicklung und der Realisierung des SAR-Lupe-Nachfolgesystems SARah.




https://www.ohb.de/news/2020/ohb-erhaelt...-bodenstationen

Das reicht denen völlig aus. Natürlich braucht ein Militär zwingend eine eigene, nicht abhörbare Kommunikationsstruktur. Und das war von Anfang an immer eine der Facetten bei der Entwicklung von Satellitenkommunikation. Der allererste Kommsat überhaupt, Courier, am 4. Oktober 1960 von der U.S. Air Force gestartet, beruhte auf dem Prinzip: aktives, bei Bedarf zeiverzögertes Richtfunksignal; dmait das gar nicht erst abgehört und dann eventuell per Brute Force dechiffriert werden konnte. (Wir haben das eher nicht so auf dem Schirm: das fällt einem eher ECHO-1 ein (das diente aber nur als passiver Reflektor zum Ausprobieren des Prinzips), TIROS-1 (das war aber der 1. Wettersatellit) oder Telstar (der erste Fernsehsatellit.)



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Johanes Offline




Beiträge: 2.415

08.01.2022 18:01
#53 RE: Und hier...? Antworten

Das mag korrekt sein und auf den Twitteraccount von OHB findet sich auch ein Retweet des Verteidigungsministeriums, das sich da hinter die Bundeswehr und seine Partner stellt.

Soweit ich es gehört habe geht das aber so aus dem Bekennerschreiben nicht hervor. Dort findet sich nur die Begründung, dass die Firma überhaupt mit der Bundeswehr zusammenarbeitet und dann ein allgemeiner Hinweis auf die deutsche Rüstungspolitik. In Bezug auf die Rüstungs- und Exportpolitik kann natürlich jeder seine eigene Meinung haben.
Diese Mittel sind aber klar ein Zeichen.



"Alles nun, was ihr wollt, daß euch die Leute tun sollen, das tut ihr ihnen auch. Das ist das Gesetz und die Propheten." (Matthäus 7,12)
"Das andre ist dies: »Du sollst deinen Nächsten lieben wie dich selbst« (3. Mose 19,18). Es ist kein anderes Gebot größer als diese." (Mark. 12,31)

Ulrich Elkmann Offline




Beiträge: 13.554

08.01.2022 20:18
#54 RE: Und hier...? Antworten

JWST. Arrretierungsvorgang abgeschlossen. Konfiguration abgeschlossen.

Zitat
ESA @esa

Moments ago, the NASA/ESA/CSA James #Webb Space Telescope successfully fully deployed its iconic 6.4 m gold-coated primary mirror, completing the final stage of all major spacecraft deployments to prepare for science operations

8:02 PM · Jan 8, 2022·Twitter Web App



https://twitter.com/esa/status/1479891232621047811

Zitat
Webb deployment complete

08/01/2022

Today the James Webb Space Telescope team successfully fully deployed its iconic 6.4-metre, gold-coated primary mirror, completing the final stage of all major spacecraft deployments to prepare for science operations.

“The successful unfolding of the Webb telescope has been a complex but impressive engineering masterpiece. On behalf of ESA, I want to sincerely congratulate our colleagues at NASA for this achievement. Webb is an international partnership led by NASA, where ESA is providing key contributions in the form of instruments, science teams and, very importantly, a successful launch on Christmas Day from the European Spaceport in Kourou. I am grateful to NASA, CSA and our European team including CNES, Arianespace and ArianeGroup for this excellent cooperation,” says Josef Aschbacher, ESA Director General.



https://www.esa.int/Science_Exploration/...oyment_complete



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

08.01.2022 21:57
#55 RE: Und hier...? Antworten

Zitat
Stephen Clark @StephenClark1

Mike Menzel, NASA’s Webb mission systems engineer, with a big statement on JWST fuel life:

"Roughly speaking, it’s around 20 years.”

It’s the first time the Webb team confirmed the mission might reach its “best-case” fuel life, double the conservative pre-launch estimate.

9:07 PM · Jan 8, 2022·TweetDeck

Stephen Clark @StephenClark1· 47m
Replying to @StephenClark1

Before launch, Keith Parrish, JWST’s commissioning manager, said the mission could reach 20 years of fuel life if the Ariane 5 rocket gave Webb a perfect ride. That’s exactly what the Ariane 5 did.


https://twitter.com/StephenClark1/status/1479907649160364044



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

10.01.2022 13:53
#56 RE: JWST Antworten

Zitat
Eric Berger @SciGuySpace

Looks like the sunshield is working! Current "hot" side temperature of the Webb telescope is 131° F, about the record high in Death Valley, Calif. The "cool" side temperature is -328° F, well below the point at which nitrogen becomes a liquid.

https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html

3:31 AM · Jan 10, 2022·TweetDeck



https://twitter.com/SciGuySpace/status/1480366653762424832

Hot Side: a: 55°C, b: 11°C
Cold Side: c: -183°C d: -201°C

16:00:34. Distance from Earth: 1.131.630 km, Distance to L2 Orbit: 314.680 km.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

18.01.2022 16:29
#57 RE: JWST Antworten

Hier kann man übrigens die Radioteleskope des DSN, des Deep Space Network verfolgen, die mit dem JWST Kontakt halten.

https://eyes.nasa.gov/dsn/dsn.html?fbcli...yp4I0rVaXO0avUE

Zurzeit sind es die Schüsseln 34 und 36 in Canberra, die da schon halb 3 morgens haben.

NAME
James Webb Space Telescope

RANGE
1.29 million km

ROUND-TRIP LIGHT TIME
8.62 sec

DATA RATE
40.00 kb/sec

FREQUENCY
2.27 GHz

POWER RECEIVED
-124.45 dBm (3.59 x 10-19 kW)



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

19.01.2022 01:05
#58 RE: JWST Antworten

Zitat
NASA Webb Telescope @NASAWebb

As of right now, all of our mirror segments except for the 2 designated as A3 & A6 have completed their 12.5 mm move! But don’t worry: We’ve always planned for A3 & A6 to be moved separately at the end of the process, as their position sensors are read out in a different way.

9:10 PM · Jan 18, 2022·Twitter Web App



https://twitter.com/NASAWebb/status/1483532330299969540



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

20.01.2022 16:07
#59 RE: JWST Antworten

Der Prozess, die 18 Segmente des Hauptsiegels in Position zu bringen, ist mittlerweile abgeschlossen.

Zitat
Last week, the Webb team began moving the observatory’s individual mirror segments out of their launch positions. Today, we hear from Erin Wolf, Webb program manager at Ball Aerospace, about the completion of that process:

“Today, the James Webb Space Telescope team completed the mirror segment deployments. As part of this effort, the motors made over a million revolutions this week, controlled through 20 cryogenic electronics boxes on the telescope. The mirror deployment team incrementally moved all 132 actuators located on the back of the primary mirror segments and secondary mirror. The primary mirror segments were driven 12.5 millimeters away from the telescope structure. Using six motors that deploy each segment approximately half the length of a paper clip, these actuators clear the mirrors from their launch restraints and give each segment enough space to later be adjusted in other directions to the optical starting position for the upcoming wavefront alignment process. The 18 radius of curvature (ROC) actuators were moved from their launch position as well. Even against beryllium’s strength, which is six times greater than that of steel, these ROC actuators individually shape the curvature of each mirror segment to set the initial parabolic shape of the primary mirror.

“Next up in the wavefront process, we will be moving mirrors in the micron and nanometer ranges to reach the final optical positions for an aligned telescope. The process of telescope alignment will take approximately three months.”

—Erin Wolf, James Webb Space Telescope Program Manager, Ball Aerospace



https://blogs.nasa.gov/webb/2022/01/19/w...ments-complete/

Webb ist mittlerweile 1,383 Mio. km entfernt; bis zum Einschwenken in den Orbit um L2 sind es noch 63.000 km; die Instrumente sind bislang auf eine Temperatur von -201° und der Hauptspiegel auf -208° ausgekühlt.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

24.01.2022 01:42
#60 RE: JWST Antworten

Zitat
Space Journey

12 Std.
·
@nasa will fire the James Webb Space Telescope's thrusters at 2pm ET (19:00 UTC) on Monday to insert the $10 billion instrument into orbit around the second Lagrange point! Credit @nasa


https://www.facebook.com/permalink.php?s...103274105493814

19:00 UTC / 20:20 MEZ.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

24.01.2022 20:39
#61 RE: JWST Antworten

Am Ziel.

Zitat
ESA Webb Telescope @ESA_Webb

Another milestone complete! White heavy check mark


Today's orbital insertion burn today was a success! #Webb has now arrived to its final orbit around the second Sun-Earth Lagrange point ("L2") around 1.5 million kilometres away (animation Down pointing backhand index). Details: https://blogs.nasa.gov/webb/2022/01/24/o...-arrives-at-l2/

8:28 PM · Jan 24, 2022·Hootsuite Inc.



https://twitter.com/ESA_Webb/status/1485695977176674308

Zitat
Orbital Insertion Burn a Success, Webb Arrives at L2

Today, at 2 p.m. EST, Webb fired its onboard thrusters for nearly five minutes (297 seconds) to complete the final postlaunch course correction to Webb’s trajectory. This mid-course correction burn inserted Webb toward its final orbit around the second Sun-Earth Lagrange point, or L2, nearly 1 million miles away from the Earth.

The final mid-course burn added only about 3.6 miles per hour (1.6 meters per second) – a mere walking pace – to Webb’s speed, which was all that was needed to send it to its preferred “halo” orbit around the L2 point.

Webb’s orbit will allow it a wide view of the cosmos at any given moment, as well as the opportunity for its telescope optics and scientific instruments to get cold enough to function and perform optimal science. Webb has used as little propellant as possible for course corrections while it travels out to the realm of L2, to leave as much remaining propellant as possible for Webb’s ordinary operations over its lifetime: station-keeping (small adjustments to keep Webb in its desired orbit) and momentum unloading (to counteract the effects of solar radiation pressure on the huge sunshield).

“During the past month, JWST has achieved amazing success and is a tribute to all the folks who spent many years and even decades to ensure mission success,” said Bill Ochs, Webb project manager at NASA’s Goddard Space Flight Center. “We are now on the verge of aligning the mirrors, instrument activation and commissioning, and the start of wondrous and astonishing discoveries.”


https://blogs.nasa.gov/webb/2022/01/24/o...-arrives-at-l2/



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

03.02.2022 20:36
#62 RE: JWST Antworten

Die Testphase und die Kalibrierung der Instrumente hat begonnen.

Zitat
NASA Webb Telescope @NASAWebb

Our NIRCam instrument's detectors saw their 1st photons of starlight! While #NASAWebb is not yet ready for science, this is the first of many steps to capture images that are at first unfocused, used to slowly fine-tune the optics: https://go.nasa.gov/3J168SB #UnfoldTheUniverse

8:28 PM · Feb 3, 2022·Sprinklr



https://twitter.com/NASAWebb/status/1489319970324496386

Zitat
Photons Incoming: Webb Team Begins Aligning the Telescope

This week, the three-month process of aligning the telescope began – and over the last day, Webb team members saw the first photons of starlight that traveled through the entire telescope and were detected by the Near Infrared Camera (NIRCam) instrument. This milestone marks the first of many steps to capture images that are at first unfocused and use them to slowly fine-tune the telescope. This is the very beginning of the process, but so far the initial results match expectations and simulations.

A team of engineers and scientists from Ball Aerospace, Space Telescope Science Institute, and NASA’s Goddard Space Flight Center will now use data taken with NIRCam to progressively align the telescope. The team developed and demonstrated the algorithms using a 1/6th scale model telescope testbed. They have simulated and rehearsed the process many times and are now ready to do this with Webb. The process will take place in seven phases over the next three months, culminating in a fully aligned telescope ready for instrument commissioning. The images taken by Webb during this period will not be “pretty” images like the new views of the universe Webb will unveil later this summer. They strictly serve the purpose of preparing the telescope for science.

To work together as a single mirror, the telescope’s 18 primary mirror segments need to match each other to a fraction of a wavelength of light – approximately 50 nanometers. To put this in perspective, if the Webb primary mirror were the size of the United States, each segment would be the size of Texas, and the team would need to line the height of those Texas-sized segments up with each other to an accuracy of about 1.5 inches.



https://blogs.nasa.gov/webb/2022/02/03/p...inkId=150733844



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

14.02.2022 18:10
#63 RE: JWST Antworten

Da sich die "Where is Webb?"-Seite ja mit dem erreichten Stand der Vorbereitungen ändert, hier noch mal ein Hinweis auf die aktuell zu verfolgende Kalibrierung der Hauptspiegelsegmente.

Zitat
Segment Image Identification

Step 1

Nominal Event Time: Starts - Launch + ~6 weeks

Status: Ongoing | Replay Media Telecon | First Photons

Webb team members saw the first photons of starlight that traveled through the entire telescope and were detected by the Near Infrared Camera (NIRCam) instrument. This milestone marks the first of many steps to capture images that are at first unfocused and use them to slowly fine-tune the telescope. This is the very beginning of the process as Segment Image Identification begins.

We are pointing the telescope at a bright, isolated star (HD 84406) to capture a series of images that are then stitched together to form a picture of that part of the sky. We don’t have just one mirror looking at this star; we have 18 mirrors, each of which is initially tilted towards a different part of the sky. As a result, we’ll actually capture 18 slightly shifted copies of the star – each one out of focus and uniquely distorted. We refer to these initial star-copies as 'segment images.'

One by one, we will move the 18 mirror segments to determine which segment creates which segment image. After matching the mirror segments to their respective images, we can tilt the mirrors to bring all the images near a common point for further analysis. We call this arrangement an 'image array.'



https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

16.03.2022 17:30
#64 RE: JWST Antworten

"NASA’s Webb Reaches Alignment Milestone, Optics Working Successfully." NASA-Video, 4 Minuten, 16. März 2022.

Zitat
Following the completion of critical mirror alignment steps, the James Webb Space Telescope team has great confidence that the observatory’s optical performance will meet or exceed the science goals it was built to achieve.

On March 11, the Webb team completed the stage of alignment known as “fine phasing” – and at this key stage in the commissioning of Webb’s Optical Telescope Element, every optical parameter that has been checked and tested is performing at, or above, expectations. The team found no critical issues and no measurable contamination or blockages to Webb’s optical path. The observatory is able to successfully gather light from distant objects and deliver it to its instruments without issue.

Although there are months to go before Webb ultimately delivers its new view of the cosmos, achieving this milestone means the team is confident that Webb’s first-of-its-kind optical system is working as well as possible.



Zitat
Scott Action (Wavefront and Controls Scientist):

We got together and looked at the very first de-fractional images that came out of the Webb Telescope. What we collectively saw as a group is: we have the highest-resolution infrared images taken from space ever. So, you think of it as a blob on a picture, you know, but it is extremely high resolution. We have exceeded every expectation. The telescope performed better than the models said it should. We even achieved - here we talk about resolution and wavefront quality - we've done better in those regards than we thought we would do, and we're just thrilled to death. And to get there we went through a process. Well, we did the segment identification, and then we formed the image array. And then, once they were in the image array, we used this phase retrieval technology to position each of the mirror segments and the secondary mirror itself, such that all optical aberrations were effectively eliminated.

We tilt the mirror segments to bring the light from mirror so that it falls on top of each other at a common point in the middle of the detector. And we call that "image stacking." And that concentrates all the light in a single place. But the segments themselves are not cooperating, they're not working together at that point. They're all their own individual telescope. And the next phase of the process is something we call "course phasing." And that's where we adjust - literally, it's the piston, it's the up-and-down motion of the mirror segments relative to each other. We control the piston of the segments so that they all come together in creating a complete monolithic primary mirror.

If you know exactly what the shape of that telescope is, and you know how the light is falling on your detector, it turns out that you can prove - you can actually prove mathematically that - that is enough information to tell you exactly what you need to do that telescope to fix the alignment errors. And why do we know this? We know this because of something called the "pupil imaging lens." And tihs allows us to take a picture of the pimary mirror of the telescope. (people refer to it as a "selfie" - well, that's what it is actually.) But that's really important, mathematically. Now there is a catch, however. Just because you know a solution to something exists does not automatically give you that solution. And that is the difficult part. That's what we've spent twenty years working out. It's highly mathematical, using something called Fourier analysis. But that's what we do: we tease out those solutions, and we find what we need to do to each optical element to achieve perfection.

We then turn to a different way of doing phase retrieval, across the entire aperture of the telescope at the same time. And for that we're not going to take the telescope out of focus. Instead we have some lenses that are in one of the science instruments that we use to automatically create a defocused image. And we look at these images, and taken as a whole. Then we can tell the last little bit of alignment errors that are in the telescope that we need to fix. And that's what we acoomplished today. We analyzed those images and we appplied the corrections, leading to the de-fractoinal imaging, the perfect performance of the telescope.

So there is only one thing left to do, and that's to see how well the telescope is aligned with the other science instruments. And we'll check the alignments there, and if necessary then we'll apply a solution that optimizes for the entire telescope. We then periodically measure the alignment of the telescope and make corrections as necessary.


https://www.youtube.com/watch?v=MiGx8xv6xjE&t=36s



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

17.03.2022 12:35
#65 RE: JWST Antworten

https://twitter.com/drbecky_/status/1504132879047135233

Zitat
Dr Becky Smethurst @drbecky_

On the NASA live stream, they just said that the resolution achieved with JWST was 0.0000194° (i.e. the smallest thing they can spot spans 0.0000194° of 360° round the sky). 28 TIMES BETTER THAN Spitzer (also an infrared space telescope) which had a resolution of 0.00056°

5:29 PM · Mar 16, 2022·Twitter Web App



Wenn ich mich da nicht verhauen habe, sind das 0,06984 Bogensekunden.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

13.04.2022 22:51
#66 RE: Ist das cool? Antworten

Zitat
Webb’s coldest instrument reaches operating temperature

13/04/2022 2145 views 28 likes

he James Webb Space Telescope will see the first galaxies to form after the Big Bang, but to do that its instruments first need to get cold – really cold. On 7 April, Webb’s Mid-Infrared Instrument (MIRI) – a joint development by ESA and NASA – reached its final operating temperature below 7 kelvins (minus 266 degrees Celsius).

“I am delighted that after so many years of hard work by the MIRI team the instrument is now cold and ready for the next steps. That the cooler worked so well is a major achievement for the mission,” said Gillian Wright, European principal investigator for MIRI and Director of the UK Astronomy Technology Centre (ATC).

Along with Webb’s three other instruments, MIRI initially cooled off in the shade of Webb’s tennis-court-size sunshield, dropping to about 90 kelvins (minus 183 C). But dropping to less than 7 kelvins required an electrically powered cryocooler. Last week, the team passed a particularly challenging milestone called the “pinch point,” when the instrument goes from 15 kelvins (minus 258 C) to 6.4 kelvins (minus 267 C).

“The MIRI cooler team has poured a lot of hard work into developing the procedure for the pinch point,” said Analyn Schneider, project manager for MIRI at NASA’s Jet Propulsion Laboratory in Southern California, USA. “The team was both excited and nervous going into the critical activity. In the end it was a textbook execution of the procedure, and the cooler performance is even better than expected.”

The low temperature is necessary because all four of Webb’s instruments detect infrared light – wavelengths slightly longer than those that human eyes can see. Distant galaxies, stars hidden in cocoons of dust, and planets outside our Solar System all emit infrared light. But so do other warm objects, including Webb’s own electronics and optics hardware. Cooling down the four instruments’ detectors and the surrounding hardware suppresses those infrared emissions. MIRI detects longer infrared wavelengths than the other three instruments, which means it needs to be even colder.

Another reason Webb’s detectors need to be cold is to suppress something called dark current, or electric current created by the vibration of atoms in the detectors themselves. Dark current mimics a true signal in the detectors, giving the false impression that they have been hit by light from an external source. Those false signals can drown out the real signals astronomers want to find. Since temperature is a measurement of how fast the atoms in the detector are vibrating, reducing the temperature means less vibration, which in turn means less dark current.



https://www.esa.int/Science_Exploration/...ing_temperature



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

16.05.2022 18:27
#67 RE: Ist das cool? Antworten

Zitat von May 12, 2022
Project officials stated in a news teleconference on Monday that all four science instruments on NASA’s James Webb Space Telescope have achieved “perfect alignment” ahead of the telescope’s official appearance this summer (May 9).

According to CBS News, NASA’s Goddard Space Flight Center in Maryland’s Michael McElwain, James Webb Space Telescope project scientist, said, “I’m thrilled to report that the telescope alignment has been completed with performance even better than we had anticipated.”

“We are able to achieve nearly flawless telescope alignment. There are no changes to the telescope optics that would boost our science performance significantly.”
...
The Webb telescope will unveil its first set of science images in July, focusing on galaxies and objects that “highlight all the Webb scientific themes… from the early Universe, to galaxies over time, to the life cycle of stars, and to other worlds,” according to Klaus Pontoppidan, project scientist at the Space Telescope Science Institute in Baltimore.



https://theglobestalk.com/webbs-recent-i...q1O-Q4ielV8RTgE



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

01.06.2022 18:19
#68 RE: Erstes Licht Antworten

Zitat
NASA @NASA

You have a date with @NASAWebb. On July 12, the first full color images and data from the world's most powerful observatory will be revealed: https://go.nasa.gov/3t91EDV

It's time to #UnfoldTheUniverse.

5:15 PM · Jun 1, 2022·Sprinklr



https://twitter.com/NASA/status/1532018001310097408

Zitat
Jun 1, 2022 First Images From NASA’s Webb Space Telescope Coming Soon

NASA’s James Webb Space Telescope, a partnership with ESA (European Space Agency) and the Canadian Space Agency (CSA), will release its first full-color images and spectroscopic data on July 12, 2022. As the largest and most complex observatory ever launched into space, Webb has been going through a six-month period of preparation before it can begin science work, calibrating its instruments to its space environment and aligning its mirrors. This careful process, not to mention years of new technology development and mission planning, has built up to the first images and data: a demonstration of Webb at its full power, ready to begin its science mission and unfold the infrared universe.



https://www.nasa.gov/feature/goddard/202...ope-coming-soon

Sie verraten aber noch nicht, welche Objekte als erste abgebildet werden.

Zitat
What Will We See?

While careful planning for Webb’s first full-color images has been underway for a long time, the new telescope is so powerful that it is difficult to predict exactly how the first images will look. “Of course, there are things we are expecting and hoping to see, but with a new telescope and this new high-resolution infrared data, we just won’t know until we see it,” said STScI’s lead science visuals developer Joseph DePasquale.

Early alignment imagery has already demonstrated the unprecedented sharpness of Webb’s infrared view. However, these new images will be the first in full color and the first to showcase Webb’s full science capabilities. In addition to imagery, Webb will be capturing spectroscopic data – detailed information astronomers can read in light. The first images package of materials will highlight the science themes that inspired the mission and will be the focus of its work: the early universe, the evolution of galaxies through time, the lifecycle of stars, and other worlds. All of Webb’s commissioning data – the data taken while aligning the telescope and preparing the instruments – will also be made publicly available.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

09.06.2022 11:52
#69 RE: Erstes Licht Antworten

Zitat
William Harwood @cbs_spacenews

JWST: NASA says a micrometeoroid hit one of the James Webb Space Telescope's 18 primary mirror segments (C3) between 23-25 May; a blog post says the telescope "is still performing at a level that exceeds all mission requirements despite a marginally detectable effect in the data"

9:17 PM · Jun 8, 2022·TweetDeck

JWST: Because Webb's mirrors are exposed to space, impacts were expected; but the recent hit was "larger than our degradation predictions assumed," says NASA's Lee Feinberg; the team is working to "develop operational approaches to assure we maximize the imaging performance"

JWST (fixing typo): The impact is the largest of 5 detected since launch; by adjusting the position of segment C3, NASA says engineers can cancel out a portion of the distortion; while such effects can be minimized, "not all of the degradation can be cancelled out this way"



https://twitter.com/cbs_spacenews/status/1534615599631982595



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

14.06.2022 18:09
#70 RE: Erstes Licht Antworten

Zitat
NASA Webb Telescope @NASAWebb

Media: Here’s your “need to know” about Webb’s first images reveal on July 12!
👉 June 29: Media Day at @SpaceTelescope

👉 July 12: Televised reveal of Webb’s first images, media briefing & more

RSVP here: https://go.nasa.gov/3OiQV1X
More details on our events timeline are below

5:57 PM · Jun 14, 2022·Sprinklr

June 29: Media Day at @SpaceTelescope
This press event will begin with a briefing on Webb’s status (remote access available). On-site attendees will then tour Webb’s Mission Operations Center. You must complete this form by June 21 to attend in person:

July 12: Live NASA TV Broadcast
Webb’s televised first images release will start at 10:30 am ET (14:30 UTC). Each image will be released one by one and made simultaneously available on NASA’s website and social media channels.

July 12: Media Opportunities
🎙️ 12 pm ET (16 UTC) - NASA and its partners will hold a joint media briefing.
🎙️ Starting 3 pm ET (19 UTC) - Webb experts will be available to conduct live, remote interviews in both English and Spanish.


https://twitter.com/NASAWebb/status/1536739494531145730



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

29.06.2022 16:22
#71 RE: Erstes Licht Antworten

Zitat
Jeff Foust @jeff_foust
NASA Deputy Administrator Pam Melroy: have confirmed that, thanks to accurate launch, JWST has enough fuel for 20 years of science lifetime.
4:09 PM · Jun 29, 2022·Tweetbot for Mac

Jeff Foust @jeff_foust · 4m
Replying to @jeff_foust
NASA’s @Dr_ThomasZ says the July 12 JWST release will include the first exoplanet spectrum taken by the telescope.
No one expected how well the commissioning of JWST went, he said. “I did not expect it.”



https://twitter.com/jeff_foust/status/1542148293756686337

Nachtrag. Momentan tun sie überall sehr geheimnisvoll.

Zitat
James Webb Space Telescope 1st photos will include 'deepest image of our universe'

We finally have hints of what the first operational images will be from NASA's deep-space observatory.

Among the first pictures coming in from the $10 billion James Webb Space Telescope will be "the deepest image of our universe that has ever been taken," according to NASA administrator Bill Nelson.

While not specifying which early-universe objects Webb will focus upon, nor how old these targets are, Nelson suggested the image will show the earliest objects yet seen. "This is farther than humanity has ever looked before, and we're only beginning to understand what Webb can and will do," he added.

Webb's new image may supersede the Hubble Space Telescope's series of deep image fields showing galaxies in our universe formed as little as a few hundred million years after the Big Bang, which took place roughly 13.7 billion years ago.

Nelson was speaking at a media event at the Space Telescope Science Institute in Baltimore, which manages Webb operations. NASA used the media event to discuss Webb's forthcoming operational image release July 12 along with the range of science the observatory will conduct early in its tenure, including solar system objects, exoplanets, the early universe and a range of targets in between.

Another of the images coming that day will be Webb's first spectrum of an exoplanet, according to Thomas Zurbuchen, associate administrator for NASA's science mission directorate, who spoke at the same event.




https://www.space.com/james-webb-space-t...aign=socialflow



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.554

08.07.2022 19:35
#72 RE: Erstes Licht Antworten

Zitat
Jul 8, 2022

NASA Shares List of Cosmic Targets for Webb Telescope’s First Images

NASA’s James Webb Space Telescope, a partnership with ESA (European Space Agency) and CSA (Canadian Space Agency), will soon reveal unprecedented and detailed views of the universe, with the upcoming release of its first full-color images and spectroscopic data.

Below is the list of cosmic objects that Webb targeted for these first observations, which will be released in NASA’s live broadcast beginning at 10:30 a.m. EDT Tuesday, July 12. Each image will simultaneously be made available on social media as well as on the agency’s website.

These listed targets below represent the first wave of full-color scientific images and spectra the observatory has gathered, and the official beginning of Webb’s general science operations. They were selected by an international committee of representatives from NASA, ESA, CSA, and the Space Telescope Science Institute.

# Carina Nebula. The Carina Nebula is one of the largest and brightest nebulae in the sky, located approximately 7,600 light-years away in the southern constellation Carina. Nebulae are stellar nurseries where stars form. The Carina Nebula is home to many massive stars, several times larger than the Sun.
# WASP-96 b (spectrum). WASP-96 b is a giant planet outside our solar system, composed mainly of gas. The planet, located nearly 1,150 light-years from Earth, orbits its star every 3.4 days. It has about half the mass of Jupiter, and its discovery was announced in 2014.
# Southern Ring Nebula. The Southern Ring, or “Eight-Burst” nebula, is a planetary nebula – an expanding cloud of gas, surrounding a dying star. It is nearly half a light-year in diameter and is located approximately 2,000 light years away from Earth.
# Stephan’s Quintet: About 290 million light-years away, Stephan’s Quintet is located in the constellation Pegasus. It is notable for being the first compact galaxy group ever discovered in 1877. Four of the five galaxies within the quintet are locked in a cosmic dance of repeated close encounters.
# SMACS 0723: Massive foreground galaxy clusters magnify and distort the light of objects behind them, permitting a deep field view into both the extremely distant and intrinsically faint galaxy populations.

The release of these first images marks the official beginning of Webb’s science operations, which will continue to explore the mission’s key science themes. Teams have already applied through a competitive process for time to use the telescope, in what astronomers call its first “cycle,” or first year of observations.



https://www.nasa.gov/feature/goddard/202...-s-first-images



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

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