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March 15, 1978 
HCMM (Heat Capacity Mapping Mission) 
LAUNCH DATE: April 1978 Expected lifetime: One year 
ORBIT: Circular, sun-synchronous, crossing Equator at 0200 and 1400 hours 
Altitude: 600 km : 
Cycle: 1M to 3% days, depending on field of view distortion and atmospheric 
: interference at large angles to nadir 
Coverage: To within 5° of poles (Data limited by range of ground stations) 
Repeat coverage (day/night passes over given area within 24 hours) 
for thermal inertia measurements every 8 days 
  
SENSOR: Sesh : Swath Data 
Wavelength Resolution width format 
Heat Capacity 0.50-1.1 yum 600 m at 700 km 1:4,000,000-scale 
Mapping Radiometer 10.5-12.5 um nadir imagery; Space 
(scanner-adapted Oblique Mercator 
Nimbus 5 surface Projection (SOM) 
composition mapping Calibrated tapes, 
radiometer) corrected or 
uncorrected 
No tape recorder. Direct transmission, S-Band. 
HCMR also flown over test sites on U-2, RB-57, and NC 130B aircraft to supply 
supportive data 
SPACECRAFT: Weight: 130 kg Diareter: 76 cm 
Height: 118 cm (solar paddles extend to 2.9 m) 
PURPOSE: Measure reflected solar energy 
Determine heat capacity of rock types 
Monitor soil moisture, thermal effluents, plant canopy temperature, 
snow cover 
GROUND STATIONS: Fairbanks, Alaska, Goldstone, Calif., Rosman, N.C., in the U.S. 
Shoe Cove, Newfoundland, Canada; Madrid, Spain; and Orroral, Australia. 
DATA AVAILABILITY: Standing orders (day visible, day IR and night IR) 
and retrospective data (CCT's, day/night temperature difference images, 
thermal inertia images) sent from Goddard to Principal Investigators. 
Standard products available to all will be listed in catalogs by 
National Space Science Data Center, Code 601, GSFC 
FOR MORE INFORMATION: 
HCMM Data Users Bulletin Users Guide for direct readout 
Code 902, NASA/GSFC : Applications, AEM-A, 1976, NASA/GSFC 
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