1964-060A
IMP B (Interplanetary Monitoring Platform B) was launched on 1964 Oct 4, 0345 by Delta C from Cape Kennedy. The Altair stage again did not burn fully and the satellite was left after orbit insertion at 0352 in a 190 x 95595 km x 33.5 deg orbit instead of the intended 200 x 200000 km, representing a 167.73 m/s underburn. Interplanetary Monitoring Platform 2, which was also given the Explorer designation Explorer 21), operated until 1965 Oct 13. Initially the orbit was toward the Sun along the Earth-Sun line (local noon) and migrated to later local times at 1 degree per day.
| IMP 2 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1964 Oct 4 | 0345:00 | Launch by Delta C | CK |
| 0347:25 | T+2:24 MECO | ||
| 0347 | Thor sep | ||
| 0347:28 | T+2:28 Delta S/N 20111 burn | ||
| 0348:02 | Fairing | ||
| 0350:25 | T+5:25 Delta SECO | -690? x 189 x 33.4 | |
| 0351:03 | Delta sep | ||
| 0351:07 | Altair 2 RH-69 (20103) burn | ||
| 0351:30 | Altair burnout over 23.3N 66.7W | ||
| 0352:23 | T+7:23 Altair sep | 190 x 95595 x 33.5 | |
| T+7:31 Solar paddles deployed | |||
| T+7:33 Flux gate booms deployed | |||
| T+7:42 Stage 3 tumble rockets fired | |||
| 0358 | Delta reentry? | ||
| 1964 Oct 24 | 2079.83 362 x 94827 x 33.8 | ||
| 1964 Dec 5 | Battery failed | ||
| 1964 Dec 10 | 2081.49 779 x 94467 x 33.7 | ||
| 1965 Jan 15 | 2080.18 916 x 94285 x 33.7 | ||
| 1965 May 21 | 2080.34 917 x 94290 x 33.7 | ||
| 1965 Aug | Last transmission | ||
| 1966 Jan | Reentered | ||
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