OSO 3
 The third Orbiting Solar Observatory, OSO 3, showing its "Sail" (upper), carrying solar experiments pointed at the Sun, and its rotating "Wheel" (lower), carrying two sky-scanning survey instruments: the UCSD hard X-ray experiment, and the MIT gamma-ray telescope | |
| Mission type | Solar physics |
|---|---|
| Operator | NASA |
| COSPAR ID | 1967-020A |
| SATCAT no. | 02703 |
| Mission duration | 2 years, 8 months |
| Spacecraft properties | |
| Manufacturer | BBRC |
| Launch mass | 281 kilograms (619 lb) |
| Start of mission | |
| Launch date | March 8, 1967, 16:19:00 UTC |
| Rocket | LC-17A |
| End of mission | |
| Last contact | November 10, 1969 |
| Decay date | April 4, 1982 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Eccentricity | 0.002164 |
| Perigee altitude | 534 kilometers (332 mi) |
| Apogee altitude | 564 kilometers (350 mi) |
| Inclination | 32.87 degrees |
| Period | 95.53 minutes |
| Mean motion | 15.07 |
| Epoch | May 8, 1967, 11:19:00 UTC[1] |
OSO 3 (Orbiting Solar Observatory 3), or Third Orbiting Solar Observatory
Like all the American Orbiting Solar Observatory (OSO) series satellites, it had two major segments: one, the "Sail", was stabilized to face the Sun, and carried both solar panels and Sun-pointing experiments for solar physics. The other, "Wheel" section, rotated to provide overall gyroscopic stability and also carried sky scanning instruments that swept the sky as the wheel turned, approximately every 2 seconds.
Instrumentation
| Name | Target | Principal Investigator |
|---|---|---|
| High Energy Gamma Ray (> 50 MeV) | anti-solar | Kraushaar, W. L., Massachusetts Institute of Technology |
| Cosmic Ray Spectrum Detector and Gamma Ray Analyzer | Sun, all-sky | Kaplon, Morton F, University of Rochester |
| Directional Radiometer Experiment | Earth | Neel, Carr B Jr, NASA Ames Research Center
|
| Earth Albedo (0.32- to 0.78-μm) | Earth | Neel, Carr B Jr, NASA Ames Research Center |
| Solar EUV Spectrometer 0.1 to 40.0 nm | Sun | Neupert, Werner M, NASA Goddard Space Flight Center
|
| 0.8- to 1.2-nm Solar X-Ray Ion Chamber | Sun | Teske, Richard G, University of Michigan |
| Solar and Celestial Gamma-Ray Telescope (7.7 to 200 keV) | Sun, all-sky | Laurence E. Peterson University of California, San Diego |
| Thermal Radiation Emissivity | near-Earth space environment | Neel, Carr B Jr, NASA Ames Research Center |
| Extreme Ultraviolet Spectrometer | Sun | Hinteregger, Hans E, Phillips Laboratory |
The Sail carried a hard X-ray experiment from UCSD, with a single thin NaI(Tl) scintillation crystal plus phototube enclosed in a howitzer-shaped CsI(Tl) anti-coincidence shield. The energy resolution was 45% at 30 keV. The instrument operated from 7.7 to 210 keV with 6 channels. The Principal Investigator (PI) was Prof.
Scientific results
OSO-3 obtained extensive hard X-ray observations of solar flares, the cosmic
The MIT gamma-ray instrument obtained the first identification of high-energy cosmic gamma rays emanating from both galactic and extra-galactic sources.[8]
See also
References
- ^ "NASA - NSSDCA - Spacecraft - Trajectory Details". nssdc.gsfc.nasa.gov. Retrieved May 2, 2018.
- ^ NASA GSFC X-ray Astronomy Satellites and Missions
- ^ [1] GSFC HEASARC "The Third Orbiting Solar Observatory (OSO-3)"
- ISSN 0031-9007.
- ISSN 0004-637X.
- ISSN 0004-637X.
- ^ Pelling, R. M. 1971, Ph.D. dissertation thesis, University of California at San Diego
- ISSN 0004-637X.
External links
The content of this article was adapted and expanded from NASA's HEASARC: Observatories OSO 3 [2] and NASA's National Space Science Data Center: OSO 3 [3] (Public Domain)
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