1990-105A
Block 5D-2 S-10 (DMSP 21544, USA 68) was launched on 1990 Dec 1 by Atlas E from Vandenberg. The Star 37S kick stage underperformed when the nozzle failed during the last second of the burn, and S-10 (now F-10) entered an elliptical orbit. The hydrazine was used to partly correct the orbit, but was depleted in the operation. Initially tumbling, the spacecraft attained three-axis stabilization by the second orbit. The shock of the kick motor failure caused the solar array initially to deploy only partly, but later on rev 2 it popped fully open. The spacecraft operated for 4 years.
| DMSP 21544 (S-10) | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1990 Dec 1 | 1557:35 | Launch by Atlas E | V SLC3W |
| 1559:39 | T+2:04 Booster sep | ||
| 1559:59 | T+2:24 Fairing sep | ||
| 1603:00 | T+5:21 SECO | ||
| 1603 | Atlas sep | ||
| 1609 | T+10:27? Star 37S burn 43.4s | ||
| 1610 | Star 37S nozzle failed T+42s | 610 x 850 x98.9 | |
| 1610 | Hydrazine burn, 32 m/s | ||
| 100.71 734 x 850 x 98.9 | |||
| 1990 Dec? | OLS cover sep | ||
| 1991 Apr 8 | 100.64 731 x 846 x 98.8 | ||
| 1993 Aug | Still operational | ||
| 1994 Sep 26 | end of ops | ||
| 1994 Dec? | OLS off | ||
| 1995 Aug 11 | 100.52 725 x 840 x 98.6 | ||
No comments:
Post a Comment