Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

Molniya-1 (11F67)

Molniya-1

The Molniya were Soviet communication satellites operating from an inclined highly elliptical earth orbit of 500 km × 40000 km with 12 hour period for coverage of high northern latitudes.

The Molniya satellites feature a unique configuration. The pressurized, three-axis stabilized KAUR-2 satellite bus features six non-articulated solar arrays and is operated in a sun-pointed mode. The antennas are mounted on two telescopic arms and are pointable. Each antenna features an optical tracking system which provides information to direct one of the two antennas to the Earth.

The KAUR-2 bus features the KDU-414 propellant system with the S5.31 engine. From 1974 onwards, it was replaced with the KDU-414A with the S5.114 engine in 1974. It is derived from the propulsion system of the Venera 1VA probes.

The Molniya-1 satellites carry the Alfa communications payload consisting of 5 transponders. It was used for bidirectional telephone, telegram or fax transmissions in the Orbita network or alternatively for TV broadcast. Three of transponders have a power of 40 W, and the other two of only 20 W. The first Molniya-1 satellites were equipped with two deployable parabolic antennas of 1.2 m diameter with a radiation pattern by 22. After the transfer of the prime contractor for Molniya-1 from OKB-1 to the OKB-10, in 1965, the antenna gain was found to be two to three times lower than expected, so OKB-10 replaced each dishes antenna by four helical antennas.

Several satellites, beginning with Molniya-1 3, carried an additional earth observation payload called Berkut consisting of two TV cameras, initially black and white, later also colour. This payload was used for meteorology and also for preparation of a early warning system.

After the initial seven satelites, NPO-PM (OKB-10) took over as manufacturer and produced the slightly changed operational Molniya-1 satellites.

Nation: USSR
Type / Application: Communication
Operator:
Contractors: OKB-1 (#1L, ..., 7L)
Equipment:
Configuration: KAUR-2
Propulsion: KDU-414 (S5.19)
Power: 6 deployable solar arrays, batteries
Lifetime:
Mass:
Orbit: 500 km × 40000 km, 65 (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
Molniya-1 (1a) (Molniya-1 2L) 1964-F07 04.06.1964 Ba LC-1/5 F Molniya
Kosmos 41 (Molniya-1 (1b)) (Molniya-1 1L) 1964-049D 22.08.1964 Ba LC-1/5 p Molniya
Molniya-1 1 (Molniya-1 3L) 1965-030A 23.04.1965 Ba LC-1/5 Molniya
Molniya-1 2 (Molniya-1 4L) 1965-080A 14.10.1965 Ba LC-1/5 Molniya
Molniya-1 (3) (Molniya-1 5L) 1966-F04 27.03.1966 Ba LC-31/6 F Molniya (M)
Molniya-1 3 (Molniya-1 6L) 1966-035A 25.04.1966 Ba LC-31/6 Molniya (M)
Molniya-1 4 (Molniya-1 7L) 1966-092A 20.10.1966 Ba LC-1/5 Molniya (M)
Further Molniya missions: