Zond 1

Zond 1
	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 ← program started Zond 2 →

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.