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- Small_Astronomy_Satellite_3 abstract "The Small Astronomy Satellite 3 (SAS 3, also known as SAS-C before launch) was a NASA X-ray astronomy space telescope. It functioned from May 7, 1975 to April 1979. It covered the X-ray range with four experiments on board. The satellite, built by the Johns Hopkins University Applied Physics Laboratory (APL), was proposed and operated by MIT's Center for Space Research (CSR). It was launched on a Scout vehicle from the Italian/Kenyan San Marco launch platform near Mombasa, Kenya, into a low-Earth, nearly equatorial orbit. It was also known as Explorer 53, as part of NASA's Explorer program.The spacecraft was 3-axis stabilized with a momentum wheel that was used to establish stability about the nominal rotation, or z-axis. The orientation of the z-axis could be altered over a period of hours using magnetic torque coils that interacted with the Earth's magnetic field. Solar panels charged batteries during the daylight portion of each orbit, so that SAS 3 had essentially no expendables to limit its lifetime beyond the life of the tape recorders, batteries, and orbital drag. The spacecraft typically operated in a rotating mode, spinning at one revolution per 95-min orbit, so that the LEDs, tube and slat collimator experiments, which looked out along the y-axis, could view and scan the sky almost continuously. The rotation could also be stopped, allowing extended (up to 30 min) pointed observations of selected sources by the y-axis instruments. Data were recorded on board by magnetic tape recorders, and played back during station passes every orbit.SAS 3 was commanded from the NASA Goddard Space Flight Center (GSFC) in Greenbelt MD, but data were transmitted by modem to MIT for scientific analysis, where scientific and technical staff were on-duty 24 hours a day. The data from each orbit were subjected to quick-look scientific analysis at MIT before the next orbital station pass, so the science operational plan could be altered by telephoned instruction from MIT to GSFC in order to study targets in near real-time.".
- Small_Astronomy_Satellite_3 cosparId "1975-037A".
- Small_Astronomy_Satellite_3 thumbnail SAS-3_layout.gif?width=300.
- Small_Astronomy_Satellite_3 wikiPageExternalLink sas3.html.
- Small_Astronomy_Satellite_3 wikiPageExternalLink SAS.html.
- Small_Astronomy_Satellite_3 wikiPageID "16079015".
- Small_Astronomy_Satellite_3 wikiPageRevisionID "588599537".
- Small_Astronomy_Satellite_3 apsis "gee".
- Small_Astronomy_Satellite_3 cosparId "1975".
- Small_Astronomy_Satellite_3 decayDate "1979-04-09".
- Small_Astronomy_Satellite_3 hasPhotoCollection Small_Astronomy_Satellite_3.
- Small_Astronomy_Satellite_3 launchDate "--05-07".
- Small_Astronomy_Satellite_3 launchRocket "Scout F-1 S194C".
- Small_Astronomy_Satellite_3 launchSite Broglio_Space_Centre.
- Small_Astronomy_Satellite_3 manufacturer "APLJohns Hopkins University".
- Small_Astronomy_Satellite_3 missionDuration "1.262304E8".
- Small_Astronomy_Satellite_3 missionType "Astronomy".
- Small_Astronomy_Satellite_3 name "Small Astronomy Satellite 3".
- Small_Astronomy_Satellite_3 operator NASA.
- Small_Astronomy_Satellite_3 orbitArgPeriapsis "37.2127".
- Small_Astronomy_Satellite_3 orbitEccentricity "3.13E-5".
- Small_Astronomy_Satellite_3 orbitEpoch "1979-04-08".
- Small_Astronomy_Satellite_3 orbitInclination "3.0033".
- Small_Astronomy_Satellite_3 orbitMeanAnomaly "322.796".
- Small_Astronomy_Satellite_3 orbitMeanMotion "16.22945651".
- Small_Astronomy_Satellite_3 orbitPeriod "5694.0".
- Small_Astronomy_Satellite_3 orbitRaan "13.5403".
- Small_Astronomy_Satellite_3 orbitReference Geocentric_orbit.
- Small_Astronomy_Satellite_3 orbitRegime Low_Earth_orbit.
- Small_Astronomy_Satellite_3 orbitRevNumber "21935".
- Small_Astronomy_Satellite_3 power "65".
- Small_Astronomy_Satellite_3 satcat "7788".
- Small_Astronomy_Satellite_3 subject Category:1975_in_spaceflight.
- Small_Astronomy_Satellite_3 subject Category:Artificial_satellites_formerly_orbiting_Earth.
- Small_Astronomy_Satellite_3 subject Category:Explorer_program.
- Small_Astronomy_Satellite_3 subject Category:Space_observatories.
- Small_Astronomy_Satellite_3 type ArtificialSatellite.
- Small_Astronomy_Satellite_3 type Satellite.
- Small_Astronomy_Satellite_3 type Thing.
- Small_Astronomy_Satellite_3 comment "The Small Astronomy Satellite 3 (SAS 3, also known as SAS-C before launch) was a NASA X-ray astronomy space telescope. It functioned from May 7, 1975 to April 1979. It covered the X-ray range with four experiments on board. The satellite, built by the Johns Hopkins University Applied Physics Laboratory (APL), was proposed and operated by MIT's Center for Space Research (CSR).".
- Small_Astronomy_Satellite_3 label "SAS-3".
- Small_Astronomy_Satellite_3 label "SAS-3".
- Small_Astronomy_Satellite_3 label "Small Astronomy Satellite 3".
- Small_Astronomy_Satellite_3 label "Small Astronomy Satellite 3".
- Small_Astronomy_Satellite_3 label "Small Astronomy Satellite 3".
- Small_Astronomy_Satellite_3 sameAs Small_Astronomy_Satellite_3.
- Small_Astronomy_Satellite_3 sameAs Small_Astronomy_Satellite_3.
- Small_Astronomy_Satellite_3 sameAs SAS-3.
- Small_Astronomy_Satellite_3 sameAs m.03qnhc3.
- Small_Astronomy_Satellite_3 sameAs Q490351.
- Small_Astronomy_Satellite_3 sameAs Q490351.
- Small_Astronomy_Satellite_3 wasDerivedFrom Small_Astronomy_Satellite_3?oldid=588599537.
- Small_Astronomy_Satellite_3 depiction SAS-3_layout.gif.
- Small_Astronomy_Satellite_3 isPrimaryTopicOf Small_Astronomy_Satellite_3.