Second heaviest satellite launched by Russia into space at 6,500 kg
Cosmos 2550 is a military satellite operated by Ministry of Defense (Russia) for the purpose of earth observation (Radar Imaging and Electronic Intelligence).
A polar LEO satellite, it was launched into space by KB Arsenal, RKTs Progress (Russia) using Soyuz 2.1b as the launch vehicle on 25 June 2021. Cosmos 2550 was constructed by KB Arsenal, RKTs Progress (Russia).
Designated with COSPAR ID 2021-056A and NORAD ID 48865, Cosmos 2550 is designed to operate in space for a lifetime of 5 years. It has a launch mass of 6,500 kg.
Taking 96 minutes to orbit the Earth, the satellite's perigee, which is the point of the orbit closest to the Earth's center of mass, is 587km while its apogee, which is the point of the orbit farthest from the Earth's center of mass, is 599km. The eccentricity of the orbit is 8.62E-04 and it orbits at an inclination of 35 degrees to the equatorial plane of the Earth.