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  #1 (permalink)  
Old 03-December-2001, 08:08 PM
brianok brianok is offline
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I've never heard of this mission which is set for 2002, sounds quite fascinating.


http://einstein.stanford.edu/index.html
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Old 04-December-2001, 07:08 AM
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It's been "imminent" for decades.

I find the concept of the navigation fascinating--they want to study a rotating sphere in a path around the Earth unhindered by friction, so they encase the sphere in another satellite and actively monitor the spheres position to keep it centered. The outside satellite runs interference for the sphere.
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Old 15-December-2001, 02:37 PM
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NASA launch forecast shows it October of 2002, from Vandenberg. Hmmm, just enough time to come up with a new theory of gravity...
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Old 19-April-2004, 02:26 PM
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Default Gravity Probe B
What happened to Probe A, and when did they know...?
:wink:
The big day is finally here, now we will learn what we pretty much allready know, but still...

http://www.ksc.nasa.gov/elvnew/gpb/index.htm

http://www.gravityprobeb.com/
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Old 19-April-2004, 02:34 PM
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Default Re: Gravity Probe B
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Originally Posted by NubiWan
What happened to Probe A, and when did they know...?
Gravity Probe B FAQ: What happened to Gravity Probe "A"?

GP-A was a suborbital mission launched in 1976.
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Old 19-April-2004, 04:19 PM
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While we're on the topic, I read in in the FAQ that the launch window for "Gravity Probe B" is extrememly short. Any ideas why?

If the thing is going into orbit (and not going to rendezvous with another object ) it seems that launch time would be pretty-much irrelevent. What am I missing?
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Old 19-April-2004, 04:27 PM
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Quote:
Originally Posted by Extravoice
While we're on the topic, I read in in the FAQ that the launch window for "Gravity Probe B" is extrememly short. Any ideas why?

If the thing is going into orbit (and not going to rendezvous with another object ) it seems that launch time would be pretty-much irrelevent. What am I missing?
That they're using a preselected guide star that needs to be continuously visible?
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Old 19-April-2004, 06:04 PM
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Launch has been postponed at least until tomorrow (12:57:24 pm EDT). Upper level wind conditions changed, and there wasn't enough time to update the profile on the launch vehicle and verify that the update was correct.
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Old 19-April-2004, 07:20 PM
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Quote:
Originally Posted by ToSeek
they're using a preselected guide star that needs to be continuously visible?
Makes sense to me. I should have read a little further into the FAQ. ops:

Thanks.
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Old 20-April-2004, 04:05 PM
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Absolutely, there is simply nothing to the "Transdimentional Rift" rumor at all, that Probe A had fell into.... Think yesterday's launch window was only 60 seconds, welp, better luck today.
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Old 20-April-2004, 05:27 PM
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From what I've read, Gravity Probe B has a one second launch window!
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Old 20-April-2004, 05:33 PM
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GP-B is ready for launch. As I write this, it's go for launch in 20 minutes! Watch it on NASA TV.
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Old 20-April-2004, 06:12 PM
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Looks like smooth launch...thanks, BA, for that "heads up'. If you hadn't posted that I would have missed the whole thing!
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Old 20-April-2004, 06:12 PM
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Quote:
Originally Posted by The Bad Astronomer
GP-B is ready for launch. As I write this, it's go for launch in 20 minutes! Watch it on NASA TV.
Successful launch! My timing was perfect, as I saw your post about a minute before it started.
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Old 20-April-2004, 06:16 PM
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I missed the launch by 9 minutes. #-o . That will teach me for eating lunch when I should've been reading the board.
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Old 20-April-2004, 06:25 PM
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I missed the launch by 9 minutes. #-o . That will teach me for eating lunch when I should've been reading the board.
Exactly! See, you're learning well. NEVER leave the board.
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Old 20-April-2004, 06:35 PM
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NEVER leave the board.
We can leave the board???
I wasn't aware of that option.
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Old 22-April-2004, 09:43 PM
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I also watched the launch; however, I have not been able to find out anything since the separation of GP-B from its booster rocket's second stage.
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Old 23-April-2004, 11:58 PM
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Gravity Probe B is Working fine
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Old 24-April-2004, 09:46 PM
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=D> =D> =D>
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Old 27-April-2004, 05:38 PM
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A Pocket of Near-Perfection - good Science@NASA article about the purpose and implementation of Gravity Probe B.
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Old 30-April-2004, 10:14 PM
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All Systems Go On Gravity Probe B

Quote:
In its first week on orbit, Gravity Probe B has achieved many successes that will ensure a smooth transition into the science phase of the mission and the best possible experimental accuracy. The spacecraft has already achieved a science mission orbit, within the plane of the Guide Star, IM Pegasi, and its inclination error is six times better than expected.
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Old 26-May-2004, 05:22 PM
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Gravity Probe B Reaches One-month Milestone

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One month into the mission, all spacecraft subsystems are continuing to perform well. The spacecraft's orbit remains stable and meets our requirements for next month's transition into the science phase of the mission, upon completion of the spacecraft initialization and orbit checkout. The four gyroscopes are suspended, and we have indications that they are rotating slightly in their housings.
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Old 22-June-2004, 02:43 AM
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Update on Gravity Probe B

Quote:
Designed to test two of Einstein's predictions about the nature of gravity and relativity, NASA's Gravity Probe B spacecraft is about halfway through the initialization and checkout phase of its mission. Mission operators have transmitted more than 5,000 commands to the spacecraft, and everything seems to be functioning properly, including its gyroscopes and the targeting system that keeps it locked onto the guide star: IM Pegasi. If everything continues to go as planned, it should begin scientific operations in August, and deliver the final results in a year.
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Old 22-June-2004, 05:18 AM
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Quote:
Originally Posted by ToSeek
Update on Gravity Probe B

Quote:
Designed to test two of Einstein's predictions about the nature of gravity and relativity, NASA's Gravity Probe B spacecraft is about halfway through the initialization and checkout phase of its mission. Mission operators have transmitted more than 5,000 commands to the spacecraft, and everything seems to be functioning properly, including its gyroscopes and the targeting system that keeps it locked onto the guide star: IM Pegasi. If everything continues to go as planned, it should begin scientific operations in August, and deliver the final results in a year.
Awesome. Looking forward to the data. Thanks ToSeek!
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Old 19-July-2004, 06:04 AM
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Default Gravity Probe B
Quote:
Originally Posted by Squink
Quote:
Originally Posted by Chip
They even have a free, full color, downloadable scale paper model ...
DARN!
Quote:
The requested URL /p_model/gpb_hq_pmodel.pdf was not found on this server.
Its a PDF file found near the bottom of their homepage. Also, their "Relativity Q&A" page is very interesting. Its found under "gp-b classroom" on the homepage, and the answers are from Dr. Sten Odenwald.
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Old 20-July-2004, 12:54 AM
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Default Re: Gravity Probe B
Quote:
Originally Posted by Chip
They even have a free, full color, downloadable scale paper model of Gravity Probe B that you can cut out and assemble!
DARN!
Quote:
The requested URL /p_model/gpb_hq_pmodel.pdf was not found on this server.
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Old 20-July-2004, 01:40 AM
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I recall reading that, though I thought it had already happened...I must be on crack.
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Old 20-July-2004, 02:37 AM
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Quote:
Originally Posted by Squink
Quote:
Originally Posted by Chip
They even have a free, full color, downloadable scale paper model ...
DARN!
Quote:
The requested URL /p_model/gpb_hq_pmodel.pdf was not found on this server.
Its a PDF file found near the bottom of their homepage. Also, their "Relativity Q&A" page is very interesting. Its found under "gp-b classroom" on the homepage, and the answers are from Dr. Sten Odenwald.
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Old 20-July-2004, 10:12 PM
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Predecessor thread to this one (with the same title and everything! ) Numerous links on there - not sure how many of interest.
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