OKEAN 3

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OKEAN 3 is classified as:

• Earth resources
• Brightest

NORAD ID: 21397
Int'l Code: 1991-039A
Perigee: 584.7 km
Apogee: 607.9 km
Inclination: 82.5 °
Period: 96.5 minutes
Semi major axis: 6967 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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1 21397U 91039A   19169.48632186  .00000174  00000-0  14334-4 0  9999
2 21397  82.5207 163.5773 0016635 314.8898  45.0971 14.92810773518879

Source of the keplerian elements: AFSPC