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Lens Thirring Effect

  1. Nov 13, 2009 #1

    Can someone update me about the success of gravity probe 2 please?

  2. jcsd
  3. Nov 13, 2009 #2
    Last edited by a moderator: Apr 24, 2017
  4. Nov 13, 2009 #3

    Vanadium 50

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    Are any of these published in peer-reviewed journals?
  5. Nov 14, 2009 #4
    Sure - the Tajmar results have been mentioned in several of his journal papers. EHT is to get an AIP paper out soon - passed 2 levels of peeer review and is at the final stage.
  6. Nov 14, 2009 #5

    Vanadium 50

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    Can you give me a reference? I see conference proceedings, but no refereed journals that discuss this.
  7. Nov 14, 2009 #6
  8. Nov 16, 2009 #7
    Vanadium 50, I searched the net I cannot see if NASA's final report is published in any peer-reviewed article, so I am not sure if this is a worthwhile test for telling frame-dragging due to earth's rotation.

    What I did manage to lay my hands on is a document at stanford university website:http://einstein.stanford.edu/content...020509-web.pdf [Broken]

    I quote the below from the pdf doc page 6. "The gyroscope is a spinning spherical body. Conceptually, therefore, Gravity Probe B is simple. All it needs is a star, a telescope, and a spinning sphere. The difficulty lies in the numbers. To reach the 0.5 marc-s/yr experiment goal calls for:
    1) One or more exceedingly accurate gyroscopes with drift rates < 10-11 deg/hr, i.e. 6 to 7 orders of magnitude better than the best modeled inertial navigation gyroscopes
    2) A reference telescope ~3 orders of magnitude better than the best previous star trackers
    3) A sufficiently bright suitably located guide star (IM Pegasi was chosen) whose proper motion with respect to remote inertial space is known to <0.5 marc-s/yr
    4) Sufficiently accurate orbit information to calibrate the science signal and calculate the two predicted effects"

    Going by its method I am not sure what is it really trying to prove and accomplish?
    Last edited by a moderator: May 4, 2017
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