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Kosmos 300

A Ye-8-5 model in the Museum of Cosmonautics, Moscow.
Mission type	Lunar sample-return
Operator	Soviet space program
COSPAR ID	1969-080A
SATCAT no.	4104
Mission duration	4 days
Spacecraft properties
Spacecraft type	Ye-8-5
Manufacturer	GSMZ Lavochkin
Launch mass	5,600 kg (12,300 lb)
Start of mission
Launch date	September 23, 1969, 14:07:00 (1969-09-23UTC14:07Z) UTC
Rocket	Proton-K/D
Launch site	Baikonur 81/24
End of mission
Disposal	Launch failure
Decay date	September 27, 1969
Orbital parameters
Reference system	Geocentric
Perigee altitude	184 km (114 mi)
Apogee altitude	189 km (117 mi)
Inclination	51.5°
Period	88.2 min
Luna programme← Luna 15Kosmos 305 → Kosmos (satellites)← Kosmos 299Kosmos 301 →

Kosmos 300 (Russian: Космос 300 meaning Cosmos 300) (Ye-8-5 series) was the fourth Soviet attempt at an uncrewed lunar sample return. It was probably similar in design to the later Luna 16 spacecraft. It was launched, on a Proton rocket, on September 23, 1969. The mission was a failure. The engines on the Block D upper stage failed due to an oxidizer leak, leaving the spacecraft to burn up in Earth's atmosphere.

References

1. "Cosmos 300". nssdc.gsfc.nasa.gov. NASA. Retrieved 25 May 2024.
2. ^ Mark Wade. "Luna Ye-8-5". Encyclopedia Astronautica. Retrieved 25 May 2024.
3. "Luna - Exploring the Moon". orbitalfocus.uk. Retrieved 23 February 2023.
4. Asif Siddiqi (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (PDF) (second ed.). NASA History Program Office. p. 92. ISBN 978-1-626-83043-1.

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