| Zond 3MV-1 No.2 | |
| Mission Type: | Venus flyby |
| Operator: | OKB-1 |
| Mission Duration: | Launch failure |
| Cospar Id: | 1964-F01 |
| Satcat: | 00277 |
| Spacecraft Type: | 3MV-1 |
| Launch Mass: | 800kg (1,800lb)[1] |
| Launch Date: | UTC[2] |
| Launch Site: | Baikonur 1/5 |
| Programme: | Venera |
| Previous Mission: | Kosmos 21 |
| Next Mission: | Kosmos 27 |
Zond 3MV-1 No.2 (or No. 4A), also known as Venera 1964A in the West, was a Soviet spacecraft, which was launched in 1964 as part of the Zond program. Due to a problem with its carrier rocket third stage, it failed to reach low Earth orbit.[3]
Zond 3MV-1 No.2 was launched at 05:47:40 UTC on 19 February 1964, atop a Molniya 8K78M carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome.[4] During ascent, LOX entered an RP-1 duct due to a leaking valve and formed a glob of explosive gel. When core separation and Blok I ignition began, the thrust section exploded. The remains of the stage and probe landed 52 miles (85 kilometers) north of the town of Barabinsk in Siberia.