Re: Gravity Probe B

From: Leo Barhorst (
Date: Sat Sep 13 2003 - 05:23:04 EDT

  • Next message: Leo Barhorst: "Re: Gravity Probe B"

    I found this on the
    e/ site
    It stated that the inclination is 90 degrees.
    Courtesy of Stanford University
    Gravity Probe B
    Mission Objectives: Gravity Probe B (GP-B) is the relativity gyroscope
    experiment being developed by NASA and Stanford University to test two
    extraordinary, unverified predictions of Albert Einstein's general theory of
    The experiment will check, very precisely, tiny changes in the direction of
    spin of four gyroscopes contained in an Earth satellite orbiting at 400-mile
    altitude directly over the poles. So free are the gyroscopes from
    disturbance that they will provide an almost perfect space-time reference
    system. They will measure how space and time are warped by the presence of
    the Earth, and, more profoundly, how the Earth's rotation drags space-time
    around with it. These effects, though small for the Earth, have far-reaching
    implications for the nature of matter and the structure of the Universe.
    ILRS Mission Support Status: Satellite laser ranging will be used in
    conjugation with GPS data to determine a precision orbit. View the GP-B
    Mission Support Request Form.
    Instrumentation:  Gravity Probe B will have the following instrumentation
    1) Four gyroscopes
    2) Quartz telescope
    3) GPS receiver
    4) Retroreflector array
    RetroReflector Array (RRA) Characteristics: The retroreflector array is to
    be determined.
    Additional information:
    Additional Links
    Gravity Probe B Parameters
    Sponsor: United States
    Expected Life: 1-2 years
    Primary Applications: relativity experiment
    Primary Applications: precision orbit determination
    COSPAR ID: to be assigned
    SIC Code: to be assigned
    NORAD SSC Code: to be assigned
    Launch Date: 2002
    RRA Diameter: to be determined
    RRA Shape: to be determined
    Reflectors: to be determined
    Orbit: polar
    Inclination: 90
    Eccentricity: to be determined
    Perigee: 650 km
    Period: to be determined
    Weight: 3334 kg
    Greetings and clear, dark skies
    Leo Barhorst Medemblik
    Cospar 4252   52.76350 N  5.09114 E  2 m ASL
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