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HST is classified as:

NORAD ID: 20580
Int'l Code: 1990-037B
Perigee: 548.8 km
Apogee: 553.1 km
Inclination: 28.5 °
Period: 95.5 minutes
Semi major axis: 6921 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   15184.07177259  .00001004  00000-0  53066-4 0  9990
2 20580 028.4705 049.3749 0003125 050.5654 077.0170 15.07510753182215

Source of the keplerian elements: AFSPC

N2YO: 241