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VANGUARD 1

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VANGUARD 1 is classified as:


NORAD ID: 5
Int'l Code: 1958-002B
Perigee: 657.6 km
Apogee: 3,842.2 km
Inclination: 34.3 °
Period: 132.8 minutes
Semi major axis: 8620 km
RCS: 0.118 m2 (medium)
Launch date: March 17, 1958
Source: United States (US)

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   15142.22393933  .00000266  00000-0  32122-3 0  9994
2 00005 034.2540 176.4157 1846985 294.0720 047.7788 10.84611134  4094

Source of the keplerian elements: AFSPC

N2YO: 347