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COBE is classified as:

NORAD ID: 20322
Int'l Code: 1989-089A
Perigee: 878.5 km
Apogee: 890.4 km
Inclination: 99.0 °
Period: 102.5 minutes
Semi major axis: 7255 km
RCS: 15.7616 m2 (large)
Launch date: November 18, 1989
Source: United States (US)

The purpose of the Cosmic Background Explorer (COBE) mission was to take precise measurements of the diffuse radiation between 1 micrometer and 1 cm over the whole celestial sphere. The following quantities were measured: (1) the spectrum of the 3 K radiation over the range 100 micrometers to 1 cm; (2) the anisotropy of this radiation from 3 to 10 mm; and, (3) the spectrum and angular distribution of diffuse infrared background radiation at wavelengths from 1 to 300 micrometers.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 20322U 89089A   16297.55646088 -.00000068  00000-0 -14941-4 0  9999
2 20322  98.9648 310.7003 0008196 198.4787 332.4411 14.04782097380132
Source of the keplerian elements: AFSPC