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COBE

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COBE is classified as:


NORAD ID: 20322
Int'l Code: 1989-089A
Launch date: November 18, 1989
Source: United States (US)
Launch site: AIR FORCE WESTERN TEST RANGE (AFWTR)

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   26250.91936510  .00000027  00000-0  43533-4 0  9993
2 20322  98.9017 251.5015 0008005 202.7296 179.2260 14.05478592886289
Source of the keplerian elements: AFSPC