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COSMOS 2139 (GLONASS)

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COSMOS 2139 (GLONASS) is classified as:


NORAD ID: 21216
Int'l Code: 1991-025A
Perigee: 19,099.0 km
Apogee: 19,174.5 km
Inclination: 65.0 °
Period: 675.7 minutes
Semi major axis: 25507 km
RCS: 1.339 m2 (large)
Launch date: April 4, 1991
Source: Commonwealth of Independent States (former USSR) (CIS)
Launch site: TYURATAM MISSILE AND SPACE COMPLEX (TTMTR)

Cosmos 2139 was a Russian Global Navigation Satellite System (GLONASS) satellite launched from the Baikonur cosmodrome aboard a Proton rocket. Originally established in order to locate the Soviet Union's civil aircraft and its merchant and fishing vessels, the signals were used by many American GPS system receivers as a complement/backup to the GPS system itself. The operational system contained 21 satellites in 3 orbital planes, with 3 on-orbit backups.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 21216U 91025A   19082.11824790 -.00000057 +00000-0 +00000-0 0  9994
2 21216 064.9584 035.8463 0014784 228.3342 131.5215 02.13105436217684
Source of the keplerian elements: AFSPC