1970-008A
The ITOS prototype, designated Tiros M before launch, combined the AVCS and APT payloads into one satellite - the earlier TOS satellites had carried either one or the other. Tiros M was launched on 1970 Jan 23 by a Delta from Space Launch Complex 2-West at Vandenberg AFB. Named Improved Tiros Operational Satellite 1 (ITOS 1) after the successful launch, the 306 kg satellite was placed in a 115.1 min, 1436 x 1482 km x 102.0 deg orbit. The second stage used roll jets to spin up the satellite prior to separation.
NASA-GSFC operated the satellite during its extended checkout and evaluation period. The satellite worked well and was turned over to ESSA on 1970 Jun 15 for operational use. ITOS 1's attitude control failed on 1971 Jun 17 and it was decommissioned.
| ITOS 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1970 Jan 23 | 1131:02 | Launch by Delta N6 | V |
| T+0:31 SRM 4-6 (Castor II) burn | |||
| T+0:49 SRM 1-3 out | |||
| T+1:10 SRM 4-6 burnout | |||
| T+1:30 SRM 1-3 (Castor I) sep | |||
| T+1:35 SRM 4-6 sep | |||
| T+3:43 MECO | |||
| T+3:45? St 1 sep | |||
| 1134:48 | T+3:46 SES-1 6:14 | ||
| 1135:02 | T+4:00 Fairing | ||
| 1140:52 | T+9:50 SECO-1 | 270 x 1460 x 102.0 (dV) | |
| 1232:05 | T+1:01:03 SES-2 | ||
| 1232:18 | T+1:01:16 SECO-2 | ||
| Roll spinup to 4 rpm | |||
| 1236:28 | T+1:05:26 St 2 sep | 115.1 1436 x 1482 x 102.0 | |
| Stage 2 retro | |||
| 1237:16 | AO-5 sep from stage 2 | ||
| Nutation dampers operated | |||
| 1970 Jun 15 | To ESSA | ||
| 1971 Jun 17 | End of ops | ||
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