COSMOS 2139 (GLONASS)

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COSMOS 2139 (GLONASS) is classified as:

Glonass Constellation

NORAD ID: 21216

Int'l Code: 1991-025A

Perigee: 19,096.4 km

Apogee: 19,177.2 km

Inclination: 65.1 °

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.

1 21216U 91025A   20261.45350682 -.00000057  00000-0  00000+0 0  9995
2 21216  65.0944  17.0790 0015848 222.7064 137.1799  2.13104980229294

Source of the keplerian elements: AFSPC