1972-058A
ERTS A was launched at 1806:06 on 1972 Jul 23 by a Delta from Vandenberg. The Delta solids separated at 1807:31 and the Thor stage at 1809:46. Delta 89 ignited at 1809:50 and cutoff at 1851:21, entering parking orbit. At 1903 the Delta restarted for an 11 second circularization burn and separated from ERTS A at 1916:41. At 1924 UT the Delta made a third burn, lowering its perigee to 635 x 910 km. ERTS 1 took its first pictures the following day. On 1973 Jan 14 the satellite was renamed Landsat 1, and it continued operating until 1978 Jan 26. Its images were used for crop forecasts, soil surveys, cartography, water supply studies, irrigation studies, geological prospecting, and monitoring of oil slick pollution.
| ERTS 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1972 Jul 23 | 1806:06 | Launch by Delta | V SLC2W |
| SRM 7-9 on at 6 km | |||
| SRM 1-6 burnout | |||
| 1807:31 | T+1:25 SRM 1-9 sep | ||
| T+3:38 MECO | |||
| 1809:46 | Thor sep | ||
| 1809:50 | Delta st 2 burn 5:31 | ||
| 1815:21 | SECO-1 | 185 x 890 x 99 | |
| 1903 | SES-2 11s | ||
| 1903 | SECO-2 | ||
| 1916:41 | St 2 sep | 903 x 921 x 99.1 | |
| 1924 | SES-3 avoidance and restart test | ||
| 1925? | SECO-3 | 635 x 910 x 98.5 (Delta) | |
| 1972 Jul 24 | First images | ||
| 1978 Jan 16 | End of ops | ||
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