1971-042A
The first of three Mars-71 probes, M-71S (3MS) No. 170 was launched on 1971 May 10. M-71S No. 170 was a light version of the M-71 series. It was intended to enter Mars orbit. The Blok-D first burn successfully placed the probe in parking orbit, but the engine failed to ignite for the second burn because of a software error. The failed probe was designated Kosmos-419 and it reentered after two days.
| Kosmos-419 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1971 May 10 | 1658:42 | Launch by Proton-K | KB |
| 1700 | Stage 2 burn | ||
| 1703 | Stage 3 burn | ||
| 1708 | Stage 3 sep | ||
| 1712? | Blok-D burn | ||
| 1714? | Blok-D cutoff | ||
| 1825? | Blok-D burn 2 failed to ignite | ||
| 1971 May 11 | 0851 | 87.52 141 x 162 x 51.5 | |
| 1971 May 11 | 1430 | 87.47 145 x 159 x 51.53 | |
| 1971 May 12 | 0936 | 87.25 137 x 139 x 51.5 | |
| 1971 May 12 | 2009? | Reentered | |
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