Tuesday, April 26, 2011

Gravity B Probe - MISSION UPDATE April 26, 2011

Check the web links for information on Gravity B Probe.
- LRK -

Final GP-B Experimental Results to be announced in a press and media event at NASA Headquarters.

NASA Headquarters Auditorium
300 E. Street SW
Washington, DC 20546-0001
Date: Wednesday, May 4, 2011
Time: 1:00-2:00 pm EDT

For more details, see our Mission Status Update...

Results from September 2009; Both geodetic & frame-dragging results are clearly visible in the data.
The geodetic and frame-dragging
measurements and the Schiff Equation
for calculating these relativity effects.


Press and Media Event at NASA Headquarters

After 34 years of research and development, 10 years of flight preparation, a 1.5 year flight mission and 5 years of data analysis, our GP-B team has arrrived at the final experimental results for this landmark test of Einstein’s 1916 general theory of relativity


NASA TV and Webcast Coverage

This GP-B press and media event will be carried live on NASA TV, and on the NASA TV website at:

Final Results to be Posted on this Web Page

Following the NASA press and media event next Wednesday, we will post a summary of the final results on this web page, including a link to a results summary paper recently accepted for publication in the journal Physical Review Letters.
As they say on the radio, stay tuned....


Some background information from Wikipedia.
- LRK -

[Some info outdated but the media event should bring you up to date. - LRK -]
Gravity Probe B (GP-B) is a satellite-based mission which launched on 20 April 2004 on a Delta II rocket.[3] The spaceflight phase lasted until 2005;[4] its aim is to measure spacetime curvature near Earth, and thereby the stress-energy tensor (which is related to the distribution and the motion of matter in space) in and near Earth. This will provide a test of general relativity, gravitomagnetism and related models. The principal investigator is Francis Everitt.

Initial results confirmed the expected geodetic effect to an accuracy of about 1%. The expected frame-dragging effect was similar in magnitude to the current noise level (the noise being dominated by initially unmodeled effects). Work is continuing to model and account for these sources of unintended signal, thus permitting extraction of the frame-dragging signal if it exists at the expected level. By August 2008 the uncertainty in the frame-dragging signal had been reduced to 15%,[5] and the December 2008 NASA report indicated that the geodetic effect was confirmed to better than 0.5%.[6]


Take note of the amount of time invested in this mission.
I must admit I haven't followed much since I left Ames.
Thanks to Fred for waking me up.
- LRK -

Thanks for looking up with me.
- LRK -

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