Autor Wątek: James Webb Space Telescope (JWST)  (Przeczytany 57673 razy)

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Offline kanarkusmaximus

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« Odpowiedź #270 dnia: Wrzesień 29, 2017, 09:45 »
Niestety i stety, ale wolałbym zobaczyć BepiColombo w drodze do Merkurego. JWST nie ma ograniczeń w okienku startowym.

Online Orionid

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« Odpowiedź #271 dnia: Październik 01, 2017, 18:46 »
Rozkładanie konstrukcji JWST
BY KRZYSZTOF KANAWKA ON 1 PAŹDZIERNIKA 2017

<a href="http://www.youtube.com/watch?v=bTxLAGchWnA" target="_blank">http://www.youtube.com/watch?v=bTxLAGchWnA</a>

Procedura rozkładania poszczególnych elementów JWST w drodze do punktu L2 / Credits – James Webb Space Telescope (JWST)

(...)
http://kosmonauta.net/2017/10/rozwijanie-konstrukcji-jwst/

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« Odpowiedź #272 dnia: Październik 20, 2017, 12:27 »
Test optyczny  ASPA zakończony pomyślnie.

Self-Portrait of NASA’s James Webb Space Telescope Marks Critical Test
Oct. 19, 2017


Ball Aerospace optical engineer Larkin Carey is reflected in the James Webb Space Telescope’s secondary mirror, as he photographs the line of sight for hardware used during an important test of the telescope’s optics.
Credits: Ball Aerospace


The actual test of the optics involved a piece of support equipment called the ASPA, a nested acronym that means "AOS Source Plate Assembly." The ASPA is a piece of hardware that sits atop Webb's Aft Optics Subsystem (AOS), which is recognizable as a black "nose cone" that protrudes from the center of Webb's primary mirror. The AOS contains the telescope's tertiary and fine-steering mirrors. The ASPA is ground test hardware, and it will be removed from the telescope before it is launched into space.

During testing, the ASPA fed laser light of various infrared wavelengths into and out of the telescope, thus acting like a source of artificial stars. In the first part of the optical test, called the "half-pass" test, the ASPA fed laser light straight into the AOS, where it was directed by the tertiary and fine-steering mirrors to Webb's science instruments, which sit in a compartment directly behind the giant primary mirror. This test let engineers make measurements of the optics inside the AOS, and how the optics interacted with the science instruments. Critically, the test verified the tertiary mirror, which is immovable, was correctly aligned to the instruments.

In another part of the test, called the "pass-and-a-half" test, light traveled in a reverse path through the telescope optics. The light was again fed into the system from the ASPA, but upwards, to the secondary mirror. The secondary mirror then reflected the light down to the primary mirror, which sent it back up to the top of Chamber A. Mirrors at the top of the chamber sent the light back down again, where it followed its normal path through the telescope to the instruments. This verified not only the alignment of the primary mirror itself but also the alignment of the whole telescope—the primary mirror, secondary mirror, and the tertiary and fine-steering mirrors inside the AOS.

https://www.nasa.gov/feature/goddard/2017/self-portrait-of-nasa-s-james-webb-space-telescope-marks-critical-test


Offline kanarkusmaximus

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« Odpowiedź #274 dnia: Listopad 15, 2017, 13:40 »
Ładna lista. :)

Online Orionid

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« Odpowiedź #275 dnia: Listopad 20, 2017, 23:30 »
I już po ok. 100-dniowych testach w komorze kriogenicznej.

NASA’s James Webb Space Telescope Completes Final Cryogenic Testing
Nov. 20, 2017

The historic chamber’s massive door opening brings to a close about 100 days of testing for Webb, a significant milestone in the telescope’s journey to the launch pad. The cryogenic vacuum test began when the chamber was sealed shut on July 10, 2017. Scientists and engineers at Johnson put Webb’s optical telescope and integrated science instrument module (OTIS) through a series of tests designed to ensure the telescope functioned as expected in an extremely cold, airless environment akin to that of space.

“After 15 years of planning, chamber refurbishment, hundreds of hours of risk-reduction testing, the dedication of more than 100 individuals through more than 90 days of testing, and surviving Hurricane Harvey, the OTIS cryogenic test has been an outstanding success,” said Bill Ochs, project manager for the James Webb Space Telescope at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “The completion of the test is one of the most significant steps in the march to launching Webb.” (...)

https://www.nasa.gov/feature/goddard/2017/nasa-s-james-webb-space-telescope-completes-final-cryogenic-testing

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« Odpowiedź #276 dnia: Grudzień 10, 2017, 07:06 »
Start możliwy jest w styczniu lub lutym 2019, ale określenie dokładniejszej daty będzie możliwe po styczniowym przeglądzie statusu misji.
Na razie głównym powodem opóźnienia startu były przedłużające się testy teleskopu.
Dalsze opóźnienia są możliwe, bo minimalizowanie ryzyka niepowodzenia misji ma priorytet.

Independent review to examine JWST launch plans
by Jeff Foust — December 7, 2017

(...) That review won’t start until January, he said, because of ongoing tests of unfolding the sunshade of the space telescope. Previous tests, he said, took much longer than anticipated, playing a key factor in the decision to delay the launch. An updated launch date, he said, would likely come in “January or February.”

Such an independent review was proposed earlier in the hearing by another witness, retired aerospace executive Thomas Young. “In my opinion, the launch date and required funding cannot be determined until a new plan is thoroughly developed and verified by independent review,” he said.

Young warned that attempting to minimize schedule delays or additional cost to JWST could add risk to the mission. “JWST is at a point in its development where the only criterion that is important is mission success,” he said. “At this stage in the project, a few extra days or weeks or even months of schedule delay, or the expenditure of some additional dollars, is a small price to pay to ensure success of a mission as important as JWST.”

Zurbuchen didn’t identify any additional issues that might lead to more delays for JWST. However, Cristina Chaplain of the Government Accountability Office cautioned that the risk for such delays remained given the assembly and testing phase the spacecraft is in.

“More delays are possible given the risks associated with the work ahead and the level of schedule reserves that are now below what is usually recommended,” she said. (...)

http://spacenews.com/independent-review-to-examine-jwst-launch-plans/

Offline kanarkusmaximus

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« Odpowiedź #277 dnia: Grudzień 10, 2017, 09:59 »
A ten przegląd to chyba któryś z uzgodnionych, typowych przeglądów statusu misji?

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« Odpowiedź #278 dnia: Grudzień 31, 2017, 23:57 »
To był bardzo ważny rok testów teleskopu

Webb Telescope’s “Silver and Gold Decorations”
Dec. 21, 2017

Webb telescope, or Webb, is NASA’s upcoming infrared space observatory, which will launch in 2019. The two photos that compose this image highlight two important achievements Webb had in the latter part of 2017.

<a href="http://www.youtube.com/watch?v=kkAMksSN5iE" target="_blank">http://www.youtube.com/watch?v=kkAMksSN5iE</a>
https://www.youtube.com/watch?v=kkAMksSN5iE

Engineers at Northrop Grumman Aerospace Systems in Redondo Beach, California, tensioned the sunshield of NASA’s James Webb Space Telescope for the first time in October 2017. Credits: Northrop Grumman

https://www.nasa.gov/feature/goddard/2017/webb-telescopes-silver-and-gold-decorations
« Ostatnia zmiana: Styczeń 02, 2018, 09:52 wysłana przez Orionid »

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« Odpowiedź #279 dnia: Styczeń 02, 2018, 23:15 »
JWST – koniec testów w komorze termiczno-próżniowej
BY REDAKCJA ON 2 STYCZNIA 2018

W grudniu zakończyły się testy teleskopu JWST w komorze termiczno-próżniowej. To ważny krok w przygotowaniach do startu misji.

W grudniu 2017 Amerykańska Agencja Kosmiczna NASA zakończyła trwający wielomiesięczny test instrumentów naukowych i elementów optycznych kosmicznego teleskopu Jamesa Webba (JWST). Próby zostały przeprowadzone w Komorze A w Centrum Kosmicznym NASA w Houston. Seria testów przygotowana przez naukowców i inżynierów polegała na sprawdzeniu działania wyżej wymienionych układów w wyjątkowo zimnym środowisku zbliżonym do przestrzeni, w której docelowo będzie JWST operować (punkt L2 układu Ziemia-Słońce).

<a href="http://www.youtube.com/watch?v=FgFkqCEntss" target="_blank">http://www.youtube.com/watch?v=FgFkqCEntss</a>
https://www.youtube.com/watch?v=FgFkqCEntss

Wyjazd JWST z komory termiczno-próżniowej (01.12.2017) / Credits – NASA Video

(...)
Redakcja serwisu Kosmonauta.net serdecznie dziękuje Panu Piotrowi Skubale za przesłany tekst.
(NASA, NG)
http://kosmonauta.net/2018/01/jwst-koniec-testow-w-komorze-termiczno-prozniowej/

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« Odpowiedź #280 dnia: Styczeń 07, 2018, 20:43 »
Webb bedzie badał też naturę brążowych karłów. Na początku zostanie obserwacji poddany  SIMP0136 , który wykazuje obecność atmosfery.

NASA’s Webb Telescope to Investigate Mysterious Brown Dwarfs
Jan. 4, 2018


Artist’s conception of a brown dwarf, featuring the cloudy atmosphere of a planet and the residual light of an almost-star.  Credits: NASA/ESA/JPL

(...) At the Université de Montréal, Étienne Artigau leads a team that will use Webb to study a specific brown dwarf, labeled SIMP0136. It is a low-mass, young, isolated brown dwarf — one of the closest to our Sun — all of which make it fascinating for study, as it has many features of a planet without being too close to the blinding light of a star. SIMP0136 was the object of a past scientific breakthrough by Artigau and his team, when they found evidence suggesting it has a cloudy atmosphere. He and his colleagues will use Webb’s spectroscopic instruments to learn more about the chemical elements and compounds in those clouds. (...)

https://www.nasa.gov/feature/goddard/2018/nasa-s-webb-telescope-to-investigate-mysterious-brown-dwarfs

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« Odpowiedź #281 dnia: Luty 27, 2018, 04:57 »
Użycie teleskopu do badania Marsa umożliwi m. in. dokładne ustalenie stosunku H2O do HDO , co pozwoli zmierzyć jak wiele wody z czerwonej Planety ubyło.

NASA's James Webb Space Telescope to Reveal Secrets of the Red Planet
Feb. 20, 2018

Much of the water Mars once held was lost over time due to ultraviolet light from the Sun breaking apart water molecules. Researchers can estimate how much water vanished by measuring the abundance of two slightly different forms of water in Mars' atmosphere - normal water (H2O) and heavy water (HDO), in which one hydrogen atom is replaced by naturally occurring deuterium. The preferential escape of lighter hydrogen over time would then lead to a skewed ratio of H2O to HDO on Mars, indicative of how much water has escaped into space. Webb will be able to measure this ratio at different times, seasons and locations.

"With Webb, we can obtain a real and accurate measurement of the ratio of H2O to HDO across Mars, permitting us to determine how much water was truly lost. We also can determine how water is exchanged between polar ice, the atmosphere, and the soil," explained Villanueva.


https://www.nasa.gov/feature/goddard/2018/nasas-james-webb-space-telescope-to-reveal-secrets-of-the-red-planet

Offline Slavin

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« Odpowiedź #282 dnia: Marzec 04, 2018, 20:06 »
« Ostatnia zmiana: Marzec 04, 2018, 20:08 wysłana przez Slavin »

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« Odpowiedź #283 dnia: Marzec 04, 2018, 20:38 »
Coż.. oby się mylili.. Choć oczywiście nikogo nie zdziwi kolejne przesunięcie.

Offline ekoplaneta

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« Odpowiedź #284 dnia: Marzec 04, 2018, 21:28 »
Matko, to ile razy będą start przesuwać? Jak zechcą na poważne startować to okaże się, że to już dzień po końcu świata  :P