Cosmos 2504 & Goniets-M n°21L to 23L

Goniets (Russian: Гонец) is a Russian civilian low Earth orbit communication satellite system. It consists of a number of satellites, derived from Strela military communication satellites. Goniets-M are upgraded versions of the Goniets satellites, a civilian derivate of the military Strela-3 satellite system. They are operated in the Goniets-D1M constellation. The Goniets system was offered to support international health organizations to meet their global communications needs for the transfer of medical data and records to remote sites.

Cosmos 2504 is a Russian military satellite.