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HST is classified as:

NORAD ID: 20580
Int'l Code: 1990-037B
Perigee: 572.1 km
Apogee: 576.0 km
Inclination: 28.5 °
Period: 96.0 minutes
Semi major axis: 6945 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   16152.04577053  .00000818  00000-0  40065-4 0  9996
2 20580  28.4709  11.9163 0002804  27.7834 126.3478 15.08373761232529
Source of the keplerian elements: AFSPC

N2YO: 552