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• Gravity_Probe_B abstract "Gravity Probe B (GP-B) is a satellite-based mission which launched on 20 April 2004 on a Delta II rocket. The spaceflight phase lasted until 2005; its aim was 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 provided a test of general relativity, gravitomagnetism and related models. The principal investigator was 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 due to nonuniform coatings on the gyroscopes). Work continued to model and account for these sources of error, thus permitting extraction of the frame-dragging signal. By August 2008, the frame-dragging effect had been confirmed to within 15% of the expected result, and the December 2008 NASA report indicated that the geodetic effect was confirmed to better than 0.5%.In an article published in the journal Physical Review Letters in 2011, the authors reported analysis of the data from all four gyroscopes results in a geodetic drift rate of −6,601.8±18.3 milliarcsecond/year (mas/yr) and a frame-dragging drift rate of −37.2±7.2 mas/yr, to be compared with the general relativity predictions of −6,606.1 mas/yr and −39.2 mas/yr, respectively (discrepancies of 0.07% and 5%, and uncertainties of 0.28% and 19%, respectively).".
• Gravity_Probe_B cosparId "2004-014A".
• Gravity_Probe_B thumbnail Artist_concept_of_Gravity_Probe_B.jpg?width=300.
• Gravity_Probe_B wikiPageExternalLink einstein.stanford.edu.
• Gravity_Probe_B wikiPageExternalLink N01.
• Gravity_Probe_B wikiPageExternalLink graphic.
• Gravity_Probe_B wikiPageExternalLink 26apr_gpbtech.htm.
• Gravity_Probe_B wikiPageExternalLink gpb.
• Gravity_Probe_B wikiPageExternalLink index.html.
• Gravity_Probe_B wikiPageExternalLink framedrag.html.
• Gravity_Probe_B wikiPageExternalLink framdrag.htm.
• Gravity_Probe_B wikiPageExternalLink Gravity_probe_B_finally_pays_off_.
• Gravity_Probe_B wikiPageExternalLink A43049-2004Jul11?language=printer.
• Gravity_Probe_B wikiPageID "531104".
• Gravity_Probe_B wikiPageRevisionID "602485806".
• Gravity_Probe_B apsis "gee".
• Gravity_Probe_B cosparId "2004".
• Gravity_Probe_B date "February 2012".
• Gravity_Probe_B deactivated "2010-12-08".
• Gravity_Probe_B disposalType "Decommissioned".
• Gravity_Probe_B hasPhotoCollection Gravity_Probe_B.
• Gravity_Probe_B launchDate "--04-20".
• Gravity_Probe_B launchRocket Delta_II.
• Gravity_Probe_B launchSite Vandenberg_AFB_Space_Launch_Complex_2.
• Gravity_Probe_B launchSite Vandenberg_Air_Force_Base.
• Gravity_Probe_B manufacturer Lockheed_Martin.
• Gravity_Probe_B missionDuration "4.60215E7".
• Gravity_Probe_B missionType "Astrophysics".
• Gravity_Probe_B name "Gravity Probe B".
• Gravity_Probe_B operator NASA.
• Gravity_Probe_B operator Stanford_University.
• Gravity_Probe_B orbitEccentricity "0.0014".
• Gravity_Probe_B orbitInclination "90.007".
• Gravity_Probe_B orbitPeriod "5859.0".
• Gravity_Probe_B orbitReference Geocentric_orbit.
• Gravity_Probe_B orbitRegime Low_Earth_orbit.
• Gravity_Probe_B power "606".
• Gravity_Probe_B power "Payload: 313 watts".
• Gravity_Probe_B power "Spacecraft: 293 watts".
• Gravity_Probe_B reason "which effect precisely? Frame dragging, as mentioned in http://iopscience.iop.org/0264-9381/24/22/N01/ ?".
• Gravity_Probe_B reason "which effect? Frame dragging or geodetic? Need precision and sourcing here. For example http://www.sciencenews.org/view/generic/id/73870/title/Gravity_probe_B_finally_pays_off_ has "reconfirm the geodetic effect with an error of about 0.2 percent. Gravity Probe B puts the frame-dragging effect at 37 milliarcseconds with an error of about 19 percent, far from the original goal of 1 percent precision."".
• Gravity_Probe_B satcat "28230".
• Gravity_Probe_B subject Category:Artificial_satellites_orbiting_Earth.
• Gravity_Probe_B subject Category:Physics_experiments.
• Gravity_Probe_B subject Category:Spacecraft_launched_by_Delta_II_rockets.
• Gravity_Probe_B subject Category:Spacecraft_launched_in_2004.
• Gravity_Probe_B subject Category:Tests_of_general_relativity.
• Gravity_Probe_B type Artifact100021939.
• Gravity_Probe_B type ArtificialSatellitesOrbitingEarth.
• Gravity_Probe_B type Conveyance103100490.
• Gravity_Probe_B type Craft103125870.
• Gravity_Probe_B type Equipment103294048.
• Gravity_Probe_B type Instrumentality103575240.
• Gravity_Probe_B type Object100002684.
• Gravity_Probe_B type PhysicalEntity100001930.
• Gravity_Probe_B type Satellite104137444.
• Gravity_Probe_B type Spacecraft104264914.
• Gravity_Probe_B type Vehicle104524313.
• Gravity_Probe_B type Whole100003553.
• Gravity_Probe_B type ArtificialSatellite.
• Gravity_Probe_B type Satellite.
• Gravity_Probe_B type Thing.
• Gravity_Probe_B comment "Gravity Probe B (GP-B) is a satellite-based mission which launched on 20 April 2004 on a Delta II rocket. The spaceflight phase lasted until 2005; its aim was 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 provided a test of general relativity, gravitomagnetism and related models.".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe B".
• Gravity_Probe_B label "Gravity Probe".
• Gravity_Probe_B label "مسبار الجاذبية".
• Gravity_Probe_B label "引力探测器B".
• Gravity_Probe_B sameAs Gravity_Probe.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B sameAs m.02m5fn.
• Gravity_Probe_B sameAs Q836799.
• Gravity_Probe_B sameAs Q836799.
• Gravity_Probe_B sameAs Gravity_Probe_B.
• Gravity_Probe_B wasDerivedFrom Gravity_Probe_B?oldid=602485806.
• Gravity_Probe_B depiction Artist_concept_of_Gravity_Probe_B.jpg.
• Gravity_Probe_B isPrimaryTopicOf Gravity_Probe_B.