1967-073A
The second POGO, Orbiting Geophysical Observatory 4, was known before launch as OGO D or S-050A. The 552 kg satellite was launched at 1421 on 1967 Jul 28 by a Thrust Augmented Thor Agena D from Vandenberg into a 97.9 min, 411 x 903 km x 86.0 deg orbit. This time attitude control was maintained until 1969 Apr. OGO IV was placed on standby on 1969 Oct 23; it was briefly switched back on for VLF experiment use on three occasions in 1970 and 1971. It reentered over Mackenzie Bay in the Yukon in 1972.
| OGO 4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1967 Jul 28 | 1421:07 | Launch by TAT Agena D | V SLC2E |
| 1421:51 | T+0:43 Castor burnout | ||
| 1422:12 | Castor sep T+1:05 | ||
| 1423:36 | Thor MECO (T+2:29) | ||
| 1423:45 | Thor VECO (T+2:38) | ||
| 1423:51 | Thor sep (T+2:44) | -5851 x 330 x 81.86 (TMX1932) | |
| 1424:51 | Agena 6802 burn (T+3:44) | ||
| 1425:01 | T+3:54 Fairing sep | ||
| 1428:53 | Agena MECO (T+7:46) | 97.90 416 x 907 x 85.99 (VCR) | |
| 1430:35 | T+9:28 Agena sep | ||
| 1430:50? | Deploy booms | ||
| 1967 Jul 29 | 0500 | 97.89 411 x 903 x 86.03 (RAE) | |
| 1969 Jan | End of NRL solar data | ||
| 1969 Apr | Attitude control failure | ||
| 1969 Jul 31 | 1900 | 96.53 403 x 775 x 85.93 (RAE) | |
| 1969 Oct 23 | Deactivated to standby mode | ||
| 1970 Feb 1 | Reactivated for VLF expt | ||
| 1970 Mar 9 | Deactivated | ||
| 1971 Jan 27 | Reactivated for VLF expt. | ||
| 1971 Feb 2 | Deactivated | ||
| 1971 Aug 1 | 0000 | 93.97 370 x 565 x 85.93 (RAE) | |
| 1971 Aug 17 | Reactivated for VLF expt. | ||
| 1971 Sep 27 | Deactivated | ||
| 1972 Aug 16 | 1034 | Reentered over Canada | |
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