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A zombie satellite is a satellite that begins communicating again after an extended period of inactivity. It is a type of space debris, which describes all defunct human-made objects in outer space. At the end of their service life, the majority of satellites suffer from orbital decay and are destroyed by the heat of atmospheric entry.
Launch of the Titan IIIA rocket with satellite Lincoln Experimental Satellite 1. The series had satellites named LES-1 through LES-9. They suffered a number of launch problems - LES-1 and LES-2 were supposed to be delivered to the same 2,800 x 15,000 km orbit, [3] though a failure of a boost stage left LES-1 in a 2,800 km circular orbit. [4]
To test the zombie star hypothesis, the area was observed again a few years after the event. The authors found that the decline of the light curve was consistent with the existence of a radioactively-heated bound remnant, but that it was difficult to come up with a model that could explain the whole light curve.
LES-2. Lincoln Experimental Satellite 2, also known as LES-2, was a communications satellite, the second of nine in the Lincoln Experimental Satellite. Launched by the United States Air Force (USAF) on 6 May 1965, it demonstrated many then-advanced technologies including active use of the military's SHF (super high frequency) band (7 to 8 GHz ...
Lincoln Experimental Satellite 3, also known as LES-3, was a communications satellite, the third of nine in the Lincoln Experimental Satellite. Launched by the United States Air Force (USAF) on 21 Dec 1965, it was stranded in a Geostationary Transfer Orbit rather than its planned circular high orbit. Despite this, LES-3 returned good data on ...
The facility officially began full operations in its final status of 3.6 MW transmitter power in the summer of 2007, yielding a maximum effective radiated power (ERP) of 5.1 gigawatts or 97.1 dBW. However, the site typically operates at a fraction of that power due to the lower antenna gain exhibited at frequencies used in standard operation. [37]
USA-280 (codenamed "Zuma") was a classified United States government satellite that was launched by SpaceX on 8 January 2018, on the 47th flight of the Falcon 9 rocket. [1] [4] The National Reconnaissance Office was in charge of the Zuma project, [5] though its purpose has not been disclosed.
LES-5 →. Lincoln Experimental Satellite 4, also known as LES-4, was a communications satellite, the fourth of nine in the Lincoln Experimental Satellite, and the first of the series designed for operations at geosynchronous altitudes. Launched by the United States Air Force (USAF) on 21 December 1965, it demonstrated many then-advanced ...