Back Зонд 1 Bulgarian জোন্ড ১ Bengali/Bangla Zond 1 Czech Zond 1 Spanish Zond 1 French Zond 1 GV जोंड 1 Hindi Zond 1 Croatian Zond–1 Hungarian Զոնդ-1 Armenian
 The Russian Zond 1 | |
| Names | Zond 3MV-1 No. 4 |
|---|---|
| Mission type | Venus lander |
| Operator | OKB-1 |
| COSPAR ID | 1964-016D |
| SATCAT no. | 00785 |
| Mission duration | 1 month and 21 days |
| Spacecraft properties | |
| Bus | 3MV-1 |
| Launch mass | 890 kg (1,960 lb) |
| Dry mass | 290 kilograms (640 lb) |
| Dimensions | 3.6 m (12 ft) tall 1.1 m (3 ft 7 in) diameter |
| Start of mission | |
| Launch date | April 2, 1964, 02:40 |
| Rocket | Molniya 8K78M |
| Launch site | Baikonur LC-1/5 |
| End of mission | |
| Last contact | May 24, 1964 |
| Orbital parameters | |
| Reference system | Heliocentric |
| Perihelion altitude | 0.652 AU |
| Aphelion altitude | 1.001 AU |
| Inclination | 3.7° |
| Period | 274 days |
| Flyby of Venus | |
| Closest approach | July 19, 1964 |
| Distance | 100,000 km (62,000 mi) |
Zond 1 was a spacecraft of the Soviet Zond program. It was the second Soviet research spacecraft to reach Venus, although communications had failed by that time. It carried a 90-centimetre (35 in) spherical landing capsule, containing experiments for chemical analysis of the atmosphere, gamma-ray measurements of surface rocks, a photometer, temperature and pressure gauges, and a motion/rocking sensor in case it landed in water. An experimental Ion thruster was also carried for evaluation.