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Author Topic: Hubble's greatest hits: Hubble space telescope images  (Read 1488 times)

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Offline CriTTer

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Hubble's greatest hits: Hubble space telescope images
« on: April 25, 2009, 02:02:40 AM »

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Offline shadylane

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Re: Hubble's greatest hits: Hubble space telescope images
« Reply #1 on: April 25, 2009, 06:45:18 AM »
I've often wondered how they stabilize the Hubble telescope. Every motor, servo or mechanical movement would cause a change in position when used. How do they counter act these forces. I bet the engineers that built it could even stop my Harley from vibrating.
"The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?"

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Re: Hubble's greatest hits: Hubble space telescope images
« Reply #2 on: April 26, 2009, 04:58:53 AM »
I've often wondered how they stabilize the Hubble telescope. Every motor, servo or mechanical movement would cause a change in position when used. How do they counter act these forces. I bet the engineers that built it could even stop my Harley from vibrating.
  there is a guy who is a member of my poker forum who is a astrophysist (retired) turn pro poker player.  He got to work with hubble ,  I will  ask him

Offline mark

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Re: Hubble's greatest hits: Hubble space telescope images
« Reply #3 on: April 26, 2009, 12:52:16 PM »
   There are some even better ones (telescopes) being built. I think they will only confirm God's wonderful creation!  Cool pictures!
We are not human beings having a spiritual experience.
We are spiritual beings having a human experience.
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Offline littlebit

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Re: Hubble's greatest hits: Hubble space telescope images
« Reply #4 on: April 26, 2009, 02:35:03 PM »
I've often wondered how they stabilize the Hubble telescope. Every motor, servo or mechanical movement would cause a change in position when used. How do they counter act these forces. I bet the engineers that built it could even stop my Harley from vibrating.

If memory serves me... I believe it uses gyroscopic stabilization.
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Offline CriTTer

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Re: Hubble's greatest hits: Hubble space telescope images
« Reply #5 on: May 01, 2009, 10:40:31 PM »
If memory serves me... I believe it uses gyroscopic stabilization.
my astrophysicist buddy at MPF told me this when i asked about it :   
 
  The short answer is gyroscopes, the long one is it was remarkably difficult.

For years before launch the infamous GSC was put together - Guide Star Catalog. Basically a huge number of stars with very accurate positions. So when you point HST at something it acquires guide stars. Then the trick is to keep it pointing at them while it's orbiting the Earth once every 90 mins. The Hubble was built with 6 gyroscopes. For most of its life it actually operated on fewer cos they have a tendency to break.

One major problem that could have been avoided had the DoD told us about it (long story) is that when the instrument crossed the termintor (day to night/night to day) we would get this terrible wobble and lose guide star lock. ("Wobble" here is vibration of fractions of a millimeter in something the size of a school bus.) We eventually figured out this was thermal shock in the solar arrays. Basically the first solar panels were rolled out on extendable struts and when they changed temperature they'd expand/contract slightly but they'd do this jerkily and it started the whole satellite shaking very slightly.

 
  there are some nice reads over there for those interested in the "big bang" i can link you to if you wish to comment be my guest he is "quite the talker" once you get him going. He also does not believe in god and i think he said his work in the field did have something to do with that..cant remember...for more info on this guy and his work with hubble you can read this article about him here  http://www.pitch.com/2003-12-11/news/the-big-bang/1  its about 6 pages long...he is retired and lives in kansas and plays poker for a living now as well as some punk rock gigs...he plays bass