Heat Capacity Mapping Mission

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HCMM (Explorer 58)
HCMM (Explorer 58)
Type: Research satellite
Country: United StatesUnited States United States
Operator: National Aeronautics and Space AdministrationNASA NASA
COSPAR-ID : 1978-041A
Mission dates
Dimensions: 134 kg
Size: 0.93 m high, 1.02 m diameter
Begin: April 26, 1978, 10:02 UTC
Starting place: Vandenberg Air Force Base , SLC-5
Launcher: Scout-D1
Status: burned up on December 22, 1981
Orbit data
Rotation time : 134 min
Orbit inclination : 97.6 °
Apogee height 646 km
Perigee height 558 km

The Heat Capacity Mapping Mission (HCMM) , or Explorer 58, was a NASA research satellite for thermal mapping of the earth. The satellite was launched on April 26, 1978 from Vandenberg with a Scout D1 rocket. After launch, HCMM entered a sun-synchronous low orbit. It was spin stabilized at 14 revolutions per minute.

HCMM was 1.7 m high, 1.25 m in diameter and consisted of two main modules, the satellite bus and the instrument carrier . Since there was no way to save data on board, data was only transmitted in real time when the satellite came in range from one of the seven ground stations. HCMM transmitted data to Earth by September 30, 1980 and burned up on December 22, 1981.

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Web links

  • HCMM on Gunters Space Page (English)