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VANGUARD 1

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VANGUARD 1 is classified as:


NORAD ID: 5
Int'l Code: 1958-002B
Perigee: 659.3 km
Apogee: 3,838.3 km
Inclination: 34.3 °
Period: 132.7 minutes
Semi major axis: 8619 km
RCS: 0.118 m2 (medium)
Launch date: March 17, 1958
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

Vanguard 1 was a small earth-orbiting satellite designed to test the launch capabilities of a three-stage launch vehicle and the effects of the environment on a satellite and its systems in Earth orbit. It also was used to obtain geodetic measurements through orbit analysis.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 00005U 58002B   21262.69428404  .00000007  00000-0 -16260-4 0  9997
2 00005  34.2557 253.4792 1844036 258.9859  79.8899 10.84820512255134
Source of the keplerian elements: Caltech