1986-088A
The followon to Hilat was based on spacecraft O-17, rescued from the Smithsonian and modified to become the Polar Beacon Experiment and Auroral Research satellite, Polar BEAR. It was launched in Nov 1986 to carry out a study of polar radio communications as Space Test Program flight P87-1. Above the Oscar a `pedestal' carried beacon electronics. Below it was the beacon wideband anteenna and the experiment deck. After launch the spacecraft was checked out by APL and then controlled from Point Mugu.
The experiments included a UV auroral imager, AIRS, and an experiment to interrogate a ground-based sensor.
| Polar Bear | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1986 Nov 14 | 0023:02 | Launch by Scout G-1 | V SLC5 |
| T+1:18 St 1 burnout | |||
| T+1:18 St 2 burn | |||
| T+1:59 St 2 burnout | |||
| T+2:03 Heatshield sep | |||
| T+2:05 Stage 3 burn | |||
| T+3:53 Stage 3 burnout | |||
| T+12:35? Stage 3 sep | -4724? x 984 x 89.6 | ||
| 0035? | T+12:40? Stage 4 burn | ||
| 0036? | T+13:14? Stage 4 burnout | ||
| 976 x 1020 x 89.65 | |||
| 0038? | Stage 4 sep | ||
| 0040? | Despin weights release | ||
| Momentum wheel activated | |||
| 18m boom deployed | |||
| 1986 Dec 12 | Operational, control to NAVASTROGRU | ||
| 1987 May 24 | Spacecraft destabilized | ||
| 1987 May 29 | Normal attitude recovered | ||
| 1990 Jan | Still operational | ||
| 1992 Oct | end of ops | ||
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