1979-017A
Space Test Program satellite P78-1 was launched on 1979 Feb 24 by Atlas F from Vandenberg and inserted into a 600 km polar orbit using a Fairchild OIS (Orbit Insertion System) upper stage. The satellite was often known by the name of one of its primary experiments, SOLWIND, which was a Naval Research Lab solar coronagraph. The SOLWIND coronagraph, in addition to studying the Sun, serendipitously discovered several comets.
P78-1 was built from the OSO-7 backup spacecraft. Size was 2.75m long 1.83m dia. According to a prelaunch Fairchild paper on the OIS, launch mass of the satellite was 925 kg; other sources give 875 kg.
The OIS had a Stage 0 adpater cylinder similar to the PTS/SVS, with a mass of 57 kg; a small Star 27 motor in a truncated conical shell 0.98m long 0.4 to 1.3m dia carrying the spin system. The motor was 363 kg and the shell was 140 kg. Nominal OIS delta-V was 787 m/s from a -1705 x 592 km x 97.7 deg transfer orbit.
On 1985 Sep 13, the satellite, which was still operating well, was destroyed by a US Air Force antisatellite weapon as a test.
| P78-1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1979 Feb 24 | 0820 | Launch by Atlas F/OIS | V |
| T+2m? Booster sep | |||
| T+5m? Atlas SECO | |||
| 256 km, 7.190 km/s, 8.14 deg | -1727 x 590 x 97.7 | ||
| 0826 | T+6m? Atlas sep from OIS | -1705 x 592 x 97.7 | |
| -1900 x 600 x 97.7 | |||
| 1979 Feb 24 | 0830? | Star 27 burn | |
| 0831? | Star 27 burnout | 96.4 563 x 602 x 97.7 | |
| 0834? | Star 27 sep | ||
| 0835? | Despin weights sep | ||
| 1985 Sep 13 | Destroyed by USAF ASAT, end of tx | ||
| 1986 Jul 2 | 1979-17JD cataloged | ||
| 1986 Jul 25 | 1979-17JF-JH cataloged | ||
| 1986 Nov | 1979-17JJ-JS cataloged | ||
| 1987 Nov | 1979-17 LG-LJ cataloged | ||
| 1988 Aug | 1979-17LZ cataloged | ||
| 1992 Jul 20 | 1979-17A reentered | ||
Payload:
- DARPA-301 Gamma ray spectrometer (trapped radiation, solar and atmospheric gamma)
- SOLWIND NRL-401 EUV and white light coronagraph/heliograph
- CRLS-229 Solar X-ray spectrometer/spectroheliograph 3-25A, 20 arcsec res. (Aerospace/NRL/Landecker)
- SOLEX A,B NRL/Aerospace solar flare XR Bragg spectrometer, NRL-128 3-25A
- MONEX NRL/Aerospace all sky X-ray monitor; auroral X-rays; NRL-601
- NRL-126 X-ray Spectroheliograph
- ECOM-721 UCB EUV airglow spectrometer 350-1400A, US Army sponsor
- ONR-601 Preliminary aerosol monitor
- CRL-251 High latitude particle spectrometer
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