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ToSeek
2006-Sep-27, 09:33 PM
Hubble's key camera shuts down again (http://www.newscientistspace.com/article.ns?id=dn10162&feedId=online-news_rss20)


The Hubble Space Telescope's most frequently used instrument, the Advanced Camera for Surveys (ACS), has shut down unexpectedly. Hubble's managers are still investigating the problem, but they are optimistic that they will be able to use the camera again soon.

ACS has three channels, which are essentially three different cameras. The problem appears to be confined to the High Resolution Channel (HRC), which has the sharpest vision, but is used in only about 10% of ACS observations.

It is often used for detailed observations of planets and other objects in our solar system because its resolution is twice as good as that of the Wide Field Channel (WFC), which is the instrument's most frequently used channel. The WFC has been used to spot galaxies in the very early universe, among other observations.

Hubble's computer shut the ACS down automatically at 1521 GMT on Saturday when it detected that the power supply voltage for the HRC, which is normally at 35 volts, had dropped to zero.

Dragon Star
2006-Sep-27, 09:43 PM
Not again...:(

allenwench
2006-Oct-02, 06:20 PM
Check out the first page of the STScI web site.
http://www.stsci.edu

Marsha

01101001
2006-Oct-02, 06:39 PM
Check out the first page of the STScI web site.
http://www.stsci.edu

Marsha

You know, you could quote a little of the interesting bit, so people don't have to visit the page to get the news. Thanks.

My guess is, you wanted us to see:


ACS Set to Resume Operations
Hubble's workhorse, the Advanced Camera for Surveys (ACS), is expected to resume science operations on Sunday, 1 October. One of its three channels, the Wide Field Channel (WFC) will be brought back into service. Observations with the WFC form an integral part of the HST science observing plan for next week.

allenwench
2006-Oct-02, 07:41 PM
Point taken.

Nicolas
2006-Oct-02, 10:11 PM
And welcome :)

Blob
2006-Oct-03, 11:13 AM
Hubble's most frequently used instrument, the Advanced Camera for Surveys (ACS), is partially functioning again, after shutting down unexpectedly last week.

Read more (http://www.newscientistspace.com/article/dn10215-hubbles-main-camera-hobbles-back-to-life.html)

Maksutov
2006-Oct-03, 11:23 AM
Wish those LGM who are working to keep us from seeing the hyperdimensional artifacts on the Moon and Mars, as well as the artificial aspects of some of Saturn's moons, and the Bosnian pyramids, would just leave our scope alone.

After all, we're only using it to perform reconnaissance missions on the few remaining humans who haven't yet succumbed to the will of our evil alien reptilian masonic illuminatied overlords.

Meanwhile, I trust Michael Griffin will accept this as another reason why the Hubble repair mission should be given a decent priority.

Nicolas
2006-Oct-03, 01:21 PM
...who haven't yet succumbed to the will of our evil alien reptilian masonic illuminatied overlords.

I, for one, welcome our new...

ToSeek
2006-Oct-11, 05:21 PM
NASA resuscitates Hubble's main camera (http://www.newscientistspace.com/article.ns?id=dn10273&feedId=online-news_rss20)


The Hubble Space Telescope's main camera has been resuscitated after shutting itself down more than two weeks ago. Programme managers say it should resume normal science observations in another week or two.

Hubble's most frequently used instrument, the Advanced Camera for Surveys (ACS), uses three "channels" that each act as a camera. All three shut down (http://www.newscientistspace.com/article/dn10162) on 23 September when managers tried to switch power from the Solar Blind Channel to the High Resolution Channel (HRC). A mechanical relay, or switch, flips back and forth to send power to either of the channels.

Managers suspected the switch did actually move as planned but that a piece of fibre or dust was in the way, blocking the electrical contact in the circuit. So on Monday at 1755 EDT (2155 GMT), they flipped the switch back and forth to try to dislodge the debris.

They received confirmation that the fix had worked at 0540 EDT (0940 GMT) on Tuesday, when the ACS's full voltage was detected and the HRC channel in particular showed vital signs again.

"I'm really happy to say that it was as good an outcome as it possibly could have been," says David Leckrone, senior project scientist for Hubble at NASA's Goddard Space Flight Center in Greenbelt, Maryland, US. "It kind of vindicates the leading theory about what the problem was."

loglo
2006-Oct-12, 07:13 AM
So do they now have a piece of debris flying around inside the ACS?

ToSeek
2006-Oct-12, 09:55 AM
So do they now have a piece of debris flying around inside the ACS?

Yes, but it's pretty much unavoidable. That's why they build spacecraft in clean rooms, to minimize this sort of thing. There's always debris; it just doesn't usually mess things up like this.

loglo
2006-Oct-13, 11:42 AM
Well at least the fix is pretty easy.

ToSeek
2006-Oct-16, 06:16 PM
Hubble Space Telescope Advanced Camera for Surveys (ACS) Status Report #2 (http://www.spaceref.com/news/viewsr.html?pid=22342)


Early on October 9 engineers sent commands to Hubble Space Telescope to toggle the suspect relay. Telemetry confirmed that the relay cycled open and closed as expected. Engineers determined this action succeeded in restoring the HRC at 5:40 am on October 9 during the first opportunity to restore power to the +35V bias line. Since this test was fully successful, further workarounds will not be required.

NASA engineers believe the cause of the open circuit was a tiny particle of dust or fabric physically interfering with the electrical contact.

Engineers will monitor performance of the HRC for the remainder of the week. If its performance remains stable HRC science observations will resume the week of October 15.

ToSeek
2006-Oct-17, 05:06 PM
NASA Hubble Space Telescope Daily Report #4220 (http://www.spaceref.com/news/viewsr.html?pid=22359)


Looks like we have another terrific ACS camera back on line and operating well.