Depiction of Explorer 27 in orbit
|SATCAT no.||Lua error in Module:Wd at line 1991: attempt to index local 'id' (a nil value).|
|Mission duration||~8 Years|
|Start of mission|
|Launch date||29 April 1965|
|Launch site||Wallops Flight Facility|
|End of mission|
|Last contact||20 July 1973|
|Perigee||932.3 km (579.3 mi)|
|Apogee||1,311.3 km (814.8 mi)|
|Radio Beacon, Langmuir probe|
Explorer 27 (or BE-C) was a satellite, launched in 1965, designed to conduct scientific research in the ionosphere. It was powered by 4 solar panels. One goal or the mission was to study in detail the shape of the Earth by way of investigating variations in its gravitational field. The satellite was shut off in 1973 because its transmission band was going to be used by higher-priority spacecraft.
Explorer 27 carried four instruments, located on the main bus. They included a Langmuir probe, used to measure the temperature or the surrounding space, a Radio Beacon to test new means of ground-to-space communication, a Doppler navigation experiment, a laser reflector to allow tracking. A three-axis magnetometer measured the orientation compared to the local magnetic field due to the Earth, and there was also a Sun sensor. A bar magnet and damping rod caused the satellite spin to match up with the magnetic field direction.
The radio transmitter operated on 162 and 324 MHz. However it was turned off on 20 July 1973 because it was interfering with other satellites.
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