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Cloudsat is an American meteorological satellite that was launched by a Delta 2 rocket from Vandenberg AFB at 11:02 UT on 28 April 2006. It will work in concert with the co-launched CALIPSO, as well as the three earlier satellites (AQUA, PARASOL, and AURA), all forming what is named as A-Train. All five have almost the same orbit, crossing the equator within 15 minutes of each other.

Cloudsat carries a single radar, CPR (Cloud Profiling Radar) to obtain the reflectivity of the clouds. It transmits and receives at 94 GHz (3.2 mm wavelength) pulses of width 3.3 microseconds, through a two-meter dish at a rate of 4,300 pps. The reflectivity is obtained at a height-resolution of 500 m, and width resolution of about 2 km. Graeme Stephens of the Colorado State University at Fort Collins is the Principal Investigator. More details are available at

Alternate Names

  • 29107

Facts in Brief

Launch Date: 2006-04-28
Launch Vehicle: Delta II
Launch Site: Vandenberg AFB, United States

Funding Agency

  • Unknown (United States)


  • Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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