The second SRET satellite was carried into orbit with another Molniya in Jun 1975. This satellite carried a test version of the cryogenic radiator for the Meteosat satellite, as well as materials exposure experiments. It was a 21.5 kg double octagon 0.56m long and 0.56m in diameter.
| SRET 2 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1975 Jun 5 | Launch by Molniya-M | PL | |
| Blok-I shutdown | |||
| Blok-L ignition | |||
| Blok-L shutdown | |||
| Molniya sep from Blok-L (TS+0:00) | |||
| SRET sep from Blok-L (TS+0:02?) | 737.8 513 x 40857 x 62.8 | ||