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HST is classified as:

NORAD ID: 20580
Int'l Code: 1990-037B
Perigee: 547.7 km
Apogee: 551.7 km
Inclination: 28.5 °
Period: 95.5 minutes
Semi major axis: 6920 km
RCS: 28.5194 m2 (large)
Launch date: April 24, 1990
Source: United States (US)

The Hubble Space Telescope (HST) was the first and flagship mission of NASA's Great Observatories program. Designed to complement the wavelength capabilities of the other spacecraft in the program (CGRO, AXAF, and SIRTF), HST was a 2.4 m, f/24 Ritchey-Chretien telescope capable of performing observations in the visible, near-ultraviolet, and near-infrared (1150 A to 1 mm).
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 20580U 90037B   15329.96995162 +.00001463 +00000-0 +81606-4 0  9990
2 20580 028.4688 166.9226 0002841 170.6682 337.1192 15.07922166204168

Source of the keplerian elements: AFSPC

N2YO: 289