Okean

Okean ( Russian Океан for ocean ) refers to a series of Russian-Ukrainian earth observation satellites in polar orbits. Okean-01 and Okean-04 (launched October 11, 1994, altitude 630–670 km) are still in operation.

Okean-01 takes photos in the spectrum from 0.8 to 1.1 µm, passively receives microwaves in the 36 GHz range and actively records radar images in the X band . The resolutions are 1.0 km, 15 km and 1.2 km, respectively. The ground station in Obninsk (about 100 km southwest of Moscow) receives the data and evaluates it.

The Ukrainian successor satellite Sich-1M is based on the bus system of the Okean series. The launch on December 24, 2004 from the Plesetsk base , Russia, does not seem to have been completely successful and only brought the satellite into a highly elliptical orbit of 644 km × 285 km with an orbit time of 93.3 minutes and an orbit inclination of 83 ° .