Kosmos 300 (Luna Ye-8-5 No.403 / Luna 16a), a Soviet uncrewed lunar sample-return attempt. Proton-K/Blok-D from Baikonur Site 81/24 lofted it on 23 September 1969; a Blok-D valve defect left the probe stranded in Earth orbit.
- Outcome
- Partial
- Orbit
- LO
- Lunar orbit
- Payload to orbit
- 5.7 T (est.)
- Flight
- 16th
- of 38 Proton / UR-500 K/D flights
- Date and time
- 23 September 1969, 14:07 UTC
- Rocket
- Proton / UR-500 K/D
- Builder
- Khrunichev
- Launch site
- 81/24 (81P), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Lunar Exploration
- International designator
- 1969-080
- Launches in 1969
- 93rd of 125
See it in orbit
Space Atlas shows the satellites and rocket stages from this launch in 3D.
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