1969-053A
The second polar IMP, IMP G (Interplanetary Monitoring Platform G), was launched on 1969 Jun 21 by Delta E from Vandenberg SLC2. The second stage yaw maneuver was omitted for range safety reasons and the final orbit was 378 x 176434 km x 86.8 deg instead of the planned 341 x 213867 x 83.8. Interplanetary Monitoring Platform 5 was also Explorer 41. The satellite underwent a partial failure on 1972 Oct 26 but continued transmitting until 1972 Dec 23 when it reentered.
| IMP 5 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1969 Jun 21 | 0847:58 | Launch by Delta E | |
| Castor II SRMs sep | |||
| 0850:28 | MECO T+2:31 | ||
| 850:35 | T+2:37 St 1 sep | ||
| 0850:35 | T+2:37 SES S/N 20226 6:12 | ||
| 0851:00 | T+3:02 Fairing M+31 | ||
| 0856:52 | T+8:54 SECO | ||
| 0859 | Yaw maneuver omitted | ||
| 0905:06 | T+17:08 St 2 sep | ||
| 0905:19 | T+17:21 TES FW4D S/N 2322-2, 31s | ||
| 0905:50 | T+17:52 TECO | ||
| 0906:19 | T+18:21 Despin | ||
| Deploy solar paddles | |||
| Deploy fluxgate boom | |||
| 0907:14 | T+19:16 St 3 sep | 4906.3 342 x 178191 x 87.0 | |
| 1969 Oct 1 | 4841.1 1071 x 175765 x 83.1 | ||
| 1970 Jan 27 | 4840.6 2100 x 174723 x 86.2 | ||
| 1970 Dec 6 | 4841.0 3777 x 173055 x 85.6 | ||
| 1971 May 23 | 4840.8 3926 x 172901 x 84.6 | ||
| 1972 Oct 26 | Partial systems failure | ||
| 1972 Dec 23 | Reentered | ||
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