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Gravity probe b project
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Goebel, J. |
| Organization | The National Aeronautics and Space Administration (NASA) |
| Copyright Year | 1998 |
| Abstract | Ames Research Center is supporting the development and manufacture of the guide-star telescope detectors of the Gravity Probe B (GPB) Project. GPB is a Stanford University/Lockheed-Martin/Marshall Space Flight Center Physical Science Mission that has called upon Ames Research Center's expertise in cryogenic electronics to help meet the program's launch schedule. The Ames technical contribution has been made over a period of 2 years and is expected to conclude shortly after launch, currently scheduled for March 2000 from Vandenberg Air Force Base. The GBP fine-motion guide-star tracking system uses a 5.6-inch aperture, all fused-quartz telescope which is attached to a quartz block assembly containing the relativistic-effect sensing gyroscopes. The guide-star telescope rotates about a central axis, thereby providing a constant pointed reference direction to a star fixed on the celestial sphere; this is the distant inertial reference frame. The satellite that contains this assembly will be in a polar orbit about Earth. The precession rate of the sensed gyroscope directional output from the distant inertial reference frame is a possible indication of a general relativistic deviation from that expected by Newtonian gravitational theory. A precession rate is expected to occur at an angular scale of a few arcseconds per year, and it is expected to be measured with an accuracy of about 0.2 milliarcsecond per year. For comparison, the apparent angular diameters of the few nearest stars, visible to all but the largest telescopes as points of light, are less than 10 milliarcseconds. The GPB fine-motion guide-star tracking system |
| File Size | 3435204 |
| File Format | |
| Alternate Webpage(s) | http://www.archive.org/details/nasa_techdoc_20040075751 |
| Archival Resource Key | ark:/13960/t93787s77 |
| Language | English |
| Publisher Date | 1998-09-01 |
| Publisher Institution | Ames Research Center |
| Access Restriction | Open |
| Subject Keyword | Aeroelasticity Torque Bending Moments Load Tests Wing Loading Calibrating Control Surfaces Extrapolation Magnitude Strain Gages Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
