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OKEAN 3

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OKEAN 3 is classified as:


NORAD ID: 21397
Int'l Code: 1991-039A
Perigee: 583.5 km
Apogee: 610.6 km
Inclination: 82.5 °
Period: 96.5 minutes
Semi major axis: 6968 km
RCS: 9.3282 m2 (large)
Launch date: June 4, 1991
Source: Commonwealth of Independent States (former USSR) (CIS)
Launch site: PLESETSK MISSILE AND SPACE COMPLEX (PKMTR)

The Okean series of satellites are all-weather radar oceanographic systems primarily designed to monitor sea-ice conditions in the Arctic Seas. The payload includes a side-looking radar, a scanning microwave radiometer, nadir-viewing microwave spectrometer, optical scanners and a data collection platform. The spacecraft is a stepped cylindrical pressurized bus 3 m high and 1.4 m diameter. The spacecraft is 3-axis stabilized (nadir pointing, aided by a gravity gradient boom), has twin solar arrays spanning 4.82 m and an 11.8 m radar antenna mounted on the Earth-facing base.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 21397U 91039A   17325.53890118 +.00000346 +00000-0 +31021-4 0  9991
2 21397 082.5211 348.9388 0019460 072.9002 287.4347 14.92585461412193
Source of the keplerian elements: AFSPC