|Launch mass||1,500 kilograms (3,300 lb)|
|Start of mission|
|Launch date||7 August 1981, 13:35UTC|
|Launch site||Plesetsk 43/3|
|Perigee altitude||825 kilometres (513 mi)|
|Apogee altitude||906 kilometres (563 mi)|
|Epoch||Epoch start: 1981-08-06 20:00:00 UTC|
It was named after the 1300th anniversary of the foundation of the Bulgarian state. It was designed to study the ionosphere and magnetosphere of the Earth.
The satellite was developed by the Bulgarian Space Agency around the "Meteor" bus, provided by the Soviet Union as part of the Interkosmos program. Assembly took place in Bulgaria, and the spacecraft was launched from Plesetsk in 13:35 local time on 7 August 1981. During that same year the Bulgarian government organized a massive celebration to commemorate the 1300th anniversary of the country's founding.
Interkosmos 22 was successfully inserted in a near-polar orbit. The outer skin of the spacecraft, including the solar panels, is coated with a conducting material in order to allow the proper measurement of electric fields and low energy plasma. Power is provided by the two solar panels, which generate 2 kW of electricity. A rechargeable battery pack is used as an energy supply when the spacecraft is in an eclipse period. Gathered data is stored on two tape recorders, each with a capacity of 60 megabits. The main transmitter radiates 10 W in the 130-MHz band. No operational limit was planned. As of 2009, the satellite was operational and it is still on BSA's list of active programs. It provides data about the extraterrestrial environment over Earth's polar regions.
The satellite contains a large set of scientific devices, designed and built in Bulgaria: