general navigation structure general satellite info ilrs support retroreflector info center of mass site performance info

Diadem-1C and -1D

Jump to: Mission Objectives, Mission Instrumentation, Mission Parameters, Additional Information

Mission Photos:

Diadem Satellite
Courtesy of CNES

Mission Objectives:

Diadème-1 D1C and Diadème-2 D1D were launched by CNES, one week apart in February 1967 into elliptical orbits. Both Diadème satellites were geodetic missions. These satellites were magnetically stabilized which limited their trackability in the southern hemisphere.

Mission Instrumentation:

Diadème has the following instrumentation onboard:

  • Dual frequency Doppler transmitters
  • Retroreflector array
Mission Parameters:
Diademe-C Diademe-D
Sponsor: CNES (France) CNES (France)
Expected Life: decades decades
Primary Application: geodesy geodesy
Primary SLR Application: geodesy geodesy
COSPAR ID: 6701101 6701401
SIC Code: 6703 6704
NORAD SSC Code: 2674 2680
Launch Date: February 08, 1967 February 15, 1967
RRA Diameter: 50 cm 50 cm
RRA Shape: 2 flattened truncated cones 2 flattened truncated cones
Reflectors: 144 corner cubes 144 corner cubes
Orbit: Elliptical Elliptical
Inclination: 39.9 degrees 39.5 degrees
Eccentricity: 0.037 0.076
Perigee: 550 km 570 km
Period: 101 minutes 108 minutes
Weight: 23 kg 23 kg