1965-042A
Interplanetary Monitoring Platform C (IMP C) was launched on 1965 May 29 at 1200 by Delta C from Cape Kennedy. The new satellite entered orbit at 1207 and became Interplanetary Monitoring Platform 3, or Explorer 28. This time the Altair overburned and the apogee was 60000 km higher than the nominal 222000 km. The orbit was 190 x 264000 km x 33.9 deg. The MIT plasma probe experiment, the Ames proton analyzer, and one of two magnetometers failed after launch: otherwise the experiments worked well. IMP III transmitted until 1967 May 11 and reentered on 1968 Jul 5.
| IMP 3 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1965 May 29 | 1200:00 | Launch by Delta C | CK LC17 |
| 1202:27 | T+2:28 MECO (3s early) | ||
| Thor sep | |||
| 1202:31 | T+2:32 Delta S/N 20009 burn, 2:43 | ||
| T+3:05 Fairing | |||
| 1205:15 | T+5:16 Delta SECO | ||
| 32s coast, spinup | |||
| T+6:02 St 2 sep, | |||
| 1206:08 | T+6:08 X-258 Altair burn, 23s | ||
| 1206:32 | T+6:32 St 3 burnout | ||
| 1206:58 | T+6:58 Yo-yo despin | ||
| 1207:42 | T+7:42 Altair sep | 190 x 264000 x 33.9 | |
| Altair tumble rockets | |||
| 8398.6 205 x 260777 x 33.87 (TMX) | |||
| 1965 May 30 | 0436 | Pass EL1:4 | |
| 1965 Jul 20 | 8402.7 3287 x 257784 x 37.4 | ||
| 1965 Aug 19 | 8401.0 4039 x 256996 x 40.7 | ||
| 1965 Sep 28 | 8393.4 7850 x 253021 x 47.1 | ||
| 1965 Dec 25 | 8400.6 15918 x 245108 x 46.2 | ||
| 1966 Jan 17 | 8452.4 17686 x 244465 x 45.9 | ||
| 1966 Feb 15 | 8366.2 18278 x 242000 x 49.1 | ||
| 1966 Mar 22 | 8326.8 21112 x 238308 x 52.5 | ||
| 1966 Apr 21 | 8416.5 24435 x 236937 x 51.5 | ||
| 1967 Jan 26 | 8454.85 35528 x 226805 x 50.1 | ||
| 1967 May 11 | End of transmissions | ||
| 1967 Oct 27 | 8341.72 32289 x 277450 x 53.6 | ||
| 1968 Jul 5 | 0030? | Reentered over Indian Ocean | |
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