|Launch Date||Sept. 23, 1969|
|Launch Site||Baikonur Cosmodrome, Kazakhstan, Russia | Launch Site 81P|
|Type||Lander, Sample Return|
|Alternate Names||1969-080A, 04104|
This was the third Soviet attempt to bring samples of lunar soil back to Earth.
None. The spacecraft reached Earth orbit, but the booster failed to fire as needed to send the probe to the Moon. About four days after launch, it reentered Earth's atmosphere.
This was the third attempt to send a sample-return spacecraft to the Moon (after failures in June and July 1969). On this attempt, the spacecraft successfully reached Earth orbit but failed to inject itself on a translunar trajectory.
Later investigation indicated that the Blok D upper stage had failed to fire a second time for translunar injection because of a problem with a fuel-injection valve that had become stuck during the first firing of the Blok D (for Earth orbital insertion). As a result, all the liquid oxygen in the Blok D was depleted. The Soviet press named the vehicle Kosmos 300 without alluding to its lunar goal. The payload's orbit decayed about four days after launch.
Launch Vehicle: Proton booster plus upper stage and escape stages, 8K82K + Blok D (Proton no. 244-01)
Spacecraft Mass: c. 5,700 kg
- stereo imaging system
- remote arm for sample collection
- radiation detector
Siddiqi, Asif A. Deep Space Chronicle: A Chronology of Deep Space and Planetary Probes 1958-2000, NASA, 2002.