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Hubble status?
Is the Hubble Space Telescope still out of commission?
I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. Otherwise, it might be dead until the rescheduled repair mission next year. |
#2
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Hubble status?
On Oct 9, 6:12 pm, Sam Wormley wrote:
Ltown wrote: Is the Hubble Space Telescope still out of commission? I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. Otherwise, it might be dead until the rescheduled repair mission next year. See:http://www.nasa.gov/mission_pages/hu...ain/index.html Ah: the key item, over and above what I saw in the news report, is that work has begun on the transition to side B, and it was expected to take about a week. There is as yet no further news, so presumably that transition has not yet been attempted, so there is no further news. John Savard |
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Hubble status?
Ltown wrote:
Is the Hubble Space Telescope still out of commission? I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. Otherwise, it might be dead until the rescheduled repair mission next year. subscribe to sci.astro.hubble. Daily status reports are posted. Several days ago spacecraft resumed normal operation. |
#4
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Hubble status?
On Oct 9, 10:25*pm, Golden California Girls
wrote: Ltown wrote: Is the Hubble Space Telescope still out of commission? I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. *Otherwise, it might be dead until the rescheduled repair mission next year. subscribe to sci.astro.hubble. *Daily status reports are posted. *Several days ago spacecraft resumed normal operation. That is not correct - the Hubble has not resumed normal operations. If all goes well, it might be back on-line at the end of next week. I sat in on a Hubble briefing three days ago. Here is the outline: ~ On September 28th the Hubble's Science Data Formatter [SDF] began to fail. The SDF mediates communications between the science instrumentation and relays data back to the ground. ~ There are two identical SDF's on the HST. It was the "A" side that failed. Engineers are now analyzing the "B" twin to ensure that it is capable of taking over the SDF's tasks. The current schedule is - if engineering approval is given, the B side will be booted up on October 15th. If "B" checks out we may resume regular operations at the end of next week. ~ Ground testing of the "B" components were completed last Monday. The Hubble team is waiting for NASA approval of the process. ~ Because of the level of integration of the Hubble's systems, in addition to booting up the "B" SDF, six additional systems must also be switched over to their "B" sides. The entire process will take at least 48 hours. ~ There does not exist an exact replica of the SDF. IF NASA decides that it is prudent to add a redundant processor to back up "B", a similar device - the Science Instrument/Command & Data Handling (SI/ C&DH) system will be installed. The SI/C&DH was built almost 20 years ago, has been kept in storage, and showed glitches when tested in 1990 and in 2001. As it seemed unlikely that the unit would be needed quickly, if at all, the glitches were not tracked down; their cause is unknown, and not yet fixed. ~ As the status of the SI/C&DH is uncertain at this time it is not yet known if it is capable of being used for a repair. ~ The SI/C&DH is now being assessed, and current plans call for it to be hooked up to the Vehicle Electrical System Test facility [VEST] in the next two weeks or so. Then there will be several weeks of running the SI/C&DH in a simulated Hubble environment to determine if the unit is up to the task. ~ Given the troubles the SI/C&DH have demonstrated, it is possible that the current plans for the STS-125 repair mission to launch in February may be overly optimistic. It is hoped that the engineering data required to make a determination will be available in mid- November. ~ In addition to replacing the SDF, Servicing Mission 4 [SM-4] will also replace two of Hubble's instruments, repair two others, and install all-new gyros, batteries and insulation. The remod is expected to give Hubble its best view of the Universe to date. The repairs are expected to extend the mission to 2014. Additional launch delays to service Hubble will put an additional strain on the Shuttle's launch schedule. Current mission guidelines call for a back-up shuttle to be on the pad, ready to launch a rescue mission, if STS-125 runs into trouble. [Because of the differing orbits of the Hubble and the International Space Station, the Station can not be used by STS-125 as a safe haven, if the Shuttle takes damage on lift-off.] The current discussion favors delaying the mission, rather than performing the flight without an available SDF spare. This may be (is likely to be?) the last chance to service Hubble, so it seems prudent to make the Hubble as sound as possible. ** Michael ** [JPL] |
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Hubble status?
"Ltown" wrote: Is the Hubble Space Telescope still out of commission? I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. Otherwise, it might be dead until the rescheduled repair mission next year. From the latest daily, it sounds like they have already recovered side A: # 18306-5 - Execute Safemode Recovery Macro @ 283/17:10z # 18304-4 - Recover SIC & DH-A to Normal w/o AP6 @ 283/17:19z # FLASH REPORT SIC&DH Recovery # At 283/17:19:16 UTC, the SIC&DH was successfully returned to Normal mode # upon completion of OR 18304-4. |
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Hubble status?
On Fri, 10 Oct 2008 15:07:38 -0700 (PDT), wrote:
On Oct 10, 12:41*pm, "Tom Jarrett" wrote: "Ltown" wrote: Is the Hubble Space Telescope still out of commission? I haven't seen any news about it since the announcement on Sep 29th. That report mentioned that a redundant system could possibly be brought on-line to allow data to be downloaded again. *Otherwise, it might be dead until the rescheduled repair mission next year. From the latest daily, it sounds like they have already recovered side A: # 18306-5 - Execute Safemode Recovery Macro @ 283/17:10z # 18304-4 - Recover SIC & DH-A to Normal w/o AP6 @ 283/17:19z # FLASH REPORT SIC&DH Recovery # At 283/17:19:16 UTC, the SIC&DH was successfully returned to Normal mode # upon completion of OR 18304-4. Press release issued today: From: Subject: NASA to Provide Update to Hubble Anomaly Status Date: 2008 October 10 12:02:44 PM GMT-04:00 To: Oct. 10, 2008 J.D. Harrington Headquarters, Washington j.d.harrington@space agency name.gov Ed Campion Goddard Space Flight Center, Greenbelt, Md. edward.s.campion@space agency name.gov MEDIA ADVISORY: M08-200 NASA TO PROVIDE UPDATE TO HUBBLE ANOMALY STATUS WASHINGTON -- NASA will host a media teleconference at 12:30 p.m. EDT, Tuesday, Oct. 14, to brief reporters about the status of efforts to revive the data handling unit that failed on the Hubble Space Telescope in late-September. The failure halted almost all science operations on the orbiting observatory. A meeting will be held at NASA Headquarters on Tuesday morning to review plans for transitioning operations to the redundant "B" side of Hubble's data handling unit. This equipment has not been used or tested since Hubble's launch in 1990. If approved, ground controllers could begin the process of sending commands to Hubble as early as Wednesday, Oct. 15, to begin the transition. The process could take as long as 48 hours to complete. The briefing participants a - Jon Morse, Astrophysics Division director in the Science Mission Directorate at NASA Headquarters in Washington. - Art Whipple, manager of the Hubble Space Telescope Systems Management Office at NASA's Goddard Space Flight Center in Greenbelt, Md. Audio of the teleconference will be streamed live at: http://www.nasa.gov/newsaudio -end- Thanks for the conference alert. I missed the live streaming. Here is the latest Hubble status report as of Wednesday, Oct 15th. All is looking good so far... http://www.nasa.gov/mission_pages/hu..._20081015.html Text below: ===================================== 10.15.08 The Hubble Space Telescope team completed switching the required hardware modules to their B-sides about 9:30 a.m. this morning and received telemetry that verified they had good data. Everything at this point looks good. The 486 computer on Hubble was reloaded with data around noon and successfully performed a data dump back to the ground to verify all the loads were proper. At 1:10 p.m. this afternoon the team brought Hubble out of safe mode and placed the 486 computer back in control. Late this afternoon, Gyro #4 (which was needed for safe mode) will be turned off. The team will reconfigure Side B of the Science Instrument Command & Data Handling (SIC&DH) computer later today and verify it is functioning properly. Around 6 p.m. this evening the spacecraft will begin executing a pre-science command load, which involves sending normal commands to control the spacecraft and resume communications satellite tracking with the HST high gain antennas. We won’t know if we’ve been completely successful until around midnight Wednesday when we demonstrate that the SIC&DH Side B is talking to the instruments and able to pass data to the ground, said HST Operations Deputy Project Manager Keith Kalinowski at NASA’s Goddard Space Flight Center in Greenbelt, Md. ===================================== |
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