1967-006A
TOS B was the second operational APT satellite. Launched from Vandenberg by Delta E at 1732 on 1967 Jan 26, it reached a 1328 x 1443 km x 102.0 deg orbit at 1750. ESSA IV was declared operational on 1967 Feb 8, replacing ESSA II, but on Dec 6 of the same year its cameras failed. The satellite was afterwards used for engineering tests.
| ESSA 4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1967 Jan 26 | 1731 | Launch by Delta E | V SLC2E |
| T+0:43 SRM out | |||
| T+1:10 SRM sep | |||
| 1733 | T+2:30 Thor S/N 20212 MECO | ||
| 1733 | St 1 sep | ||
| 1733 | T+2:34 Delta S/N 20212 burn 6:07 | ||
| T+2:38 Fairing | |||
| 1739:49 | T+8:49 Delta S/N 20212 SECO 846 km 5.872 km/s | ||
| 1749:23 | T+18:23 X-258 RH91 burn 22.7s 1425 km 5.180 km/s | ||
| 1749:46 | T+18:46 X-258 burnout 7.293 km/s | ||
| 1751:08 | T+20:08 St 3 sep | 1328 x 1443 x 102.0 | |
| 1967 Jan 26 | 1758 | St 3 depletion burn | |
| 1967 Feb 8 | Operational, replaced ESSA 2 | ||
| 1967 Dec 6 | Camera power supply failure | ||
| 1968 May 5 | End of ops | ||
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