1983-004A
IRAS carried out a far infrared survey of the sky in the 12, 25, 60 and 100 micron bands. The Infrared Astronomical Satellite was launched on 1983 Jan 26 by a Delta 3910 from Vandenberg into a 900 km sun-synchronous orbit. The aperture cover was ejected on 1983 Feb 1 and the infrared sky survey began on Feb 9. The liquid helium cryogen was depleted in Nov 1983 after 9 months of operation; after some engineering tests the satellite was turned off. It was reactivated in 1985 for tests of in-flight software reconfiguration.
| IRAS | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1983 Jan 26 | 0217:00 | Launch by Delta 3910 | V SLC2 |
| T+0:57 SRM 1-6 burnoyt | |||
| T+1:00 SRM 7-9 on | |||
| 0218:19 | T+1:19 SRM 1-6 sep | ||
| T+1:58 SRM 7-9 out | |||
| 0219:00 | T+2:00 SRM 7-9 sep | ||
| 0220:47 | T+3:47 MECO | ||
| T+3:55 Stage 1 sep | |||
| 0221:00 | T+4:00 SES-1 4:58 | ||
| T+4:04 Fairing | |||
| 0225:58 | T+8:58 SECO | 457 x 915 x 99.1 | |
| 0315:20 | T+58:20 SES-2 7s | ||
| 0315:27 | T+58:27 SECO-2 | ||
| 0319:20 | T+1:02:20 Delta sep | 103.1 896 x 913 x 99.1 | |
| 1983 Jan 31 | 1937 | Aperture cover ejected | |
| 1983 Feb 9 | Sky survey begins | ||
| 1983 Nov 22 | 0130 | helium depleted | |
| 1983 Nov 23 | Engineering tests | ||
| 1983 Nov? | end of ops | ||
| 1985 | Reactivated | ||
| 1985 May 9 | Deactivated | ||
| 1985 May 10 | Reactivated | ||
| 1985 May 10 | Deactivated | ||
| 1985 Nov 7 | Transmitter activated | ||
| 1985 Nov 21 | Telemetry ok | ||
| 1985 Nov | Final deactivation | ||
Payload:
- IR telescope: 60 cm (57cm?) Ritchey-Chretien f/9.6 Be mirror telescope cooled to 3K
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