1971-083A
OSO H (Orbiting Solar Observatory 7) was launched at 0945 on 1971 Sep 29 by a two stage Delta N from Cape Canaveral. The Delta second stage had attitude control issues during the second burn, resulting in a low perigee orbit of 93.4 min, 323 x 571 km x 33.1 deg. The spacecraft observed the Sun until 1974 Jul 6 when its attitude control gas was depleted; it reentered on 1974 Jul 9 over the South Pacific.
| OSO 7 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1971 Sep 29 | 0945:00 | Launch by Delta N | CC LC17A |
| T+1:15 SRM 1-3 sep | |||
| T+3:39 MECO | |||
| T+3:42 St 1 sep | |||
| 0948:43 | T+3:43 SES-1 | ||
| 0948:50 | T+3:50? Fairing | ||
| 0954:57 | T+9:57 SECO-1 | ||
| 1013:20 | T+28:20 SES-2 | ||
| 1013:27 | T+28:27 SECO-2 | 93.4 323 x 571 x 33.1 | |
| 1018 | T+33:15s S+0m St 2 sep | ||
| 1036 | T+51:35s S+18m TETR sep from St 2 | ||
| 1973 May | end of MIT XR expt ops | ||
| 1974 Jul 6 | end of tx | ||
| 1974 Jul 9 | Reentered | ||
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