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Track OAO 3 (COPERNICUS) now!
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OAO 3 (COPERNICUS) is classified as:

NORAD ID: 6153
Int'l Code: 1972-065A
Perigee: 700.5 km
Apogee: 709.4 km
Inclination: 35.0 °
Period: 98.7 minutes
Semi major axis: 7075 km
RCS: 6.8136 m2 (large)
Launch date: August 21, 1972
Source: United States (US)

This mission was the third in the OAO program and its second successful spacecraft to observe the celestial sphere from above the Earth's atmosphere. A UV telescope with a spectrometer measured high-resolution spectra of stars, galaxies, and planets with the main emphasis on the determination of interstellar absorption lines. Three X-ray telescopes and a collimated proportional counter provided measurements of celestial X-ray sources and interstellar absorption between 1 and 100 A.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1  6153U 72065A   23276.38901733  .00000727  00000-0  15851-3 0  9998
2  6153  35.0069 312.9221 0006292 101.7655 276.7153 14.58553052716636
Source of the keplerian elements: AFSPC