1961-002A
The third Soviet planetary probe was 1VA No. 1, similar to the Mars probes but intended for Venus. It would have been named AMS Venera if successful, but although the 8K78 reached orbit for the first time and the BOZ unit (an ullage motor system on the adapter platform) was switched on, the Blok-L fourth stage of the launch vehicle failed to ignite due to an electrical power failure. The combined 1VA and Blok-L remained attached in low orbit, and was referred to by the Soviet press as a `heavy satellite' (Tyazhyoliy Sputnik). The Western press labelled the assembly Sputnik 7. The Blok-L engine was built by the Isaev bureau.
| 1VA No. 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1961 Feb 4 | 0118:03 | Launch by 8K78 | KB |
| 0123 | Blok-A sep | ||
| 0123 | Blok-I burn | ||
| 0127 | Blok-I sep | 212 x 318 x 65.0 | |
| 0218 | BOZ ignition | ||
| 0219 | Blok-L failed to ignite | ||
| 0219 | BOZ sep? | ||
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