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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: 19,100.3 km
Apogee: 19,173.2 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   19140.30581718 -.00000074  00000-0  00000+0 0  9998
2 21216  64.9761  33.8368 0014292 226.6164 133.3093  2.13105451218929
Source of the keplerian elements: AFSPC