1996-037A
The TOMS-Earth Probe, TOMS-EP94, carried a single experiment, Total Ozone Mapping Spectrometer Flight Model 3. TOMS FM1 had flown on Nimbus 7, and FM2 flew on a 1991 Meteor satellite. TOMS-EP, originally Earth Probe '93, had been intended for launch in 1993 to take over from TOMS FM2, which eventually failed in 1994. The problems with the Pegasus launch vehicle delayed it to 1996, placing it close to the planned launch of FM4 on Japan's ADEOS. Its mission was altered to lower the target orbit from the original 900 km to 500 km for higher resolution studies.
The TOMS instrument was derived from the older SBUV first flown on Nimbus 4 in 1970. Mission operations from GSFC.
In Jul 1996 it was finally launched on the fourth Pegasus XL, carried aloft by the L-1011 carrier plane from Vandenberg. The three stage Pegasus delivered it to an elliptical polar orbit.
A monopropellant hydrazine propulsion engine delivered TOMS-EP to its final circular orbit. TOMS used TRW's STEP/Eagle class T-200 Lightsat bus, based on Defense Systems (DSI) technology. Launch mass of TOMS-EP was 295 kg including 73 kg of propellant. The satellite is 1.8m long x 1.1m wide; with solar arrays deployed 2.4 x 3.9m.
| TOMS-EP94 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1996 Jul 2 | L-1011 takeoff from Vandenberg | ||
| 0748 | T-0:05 Pegasus drop at 38kft, launch | ||
| T+0:00, D+0:05 Stage 1 burn | |||
| T+1:15 Stage 1 burnout | |||
| T+1:32 Stage 1 sep, stage 2 burn | |||
| D+2:27 Fairing | |||
| 0750 | D+2:41 Stage 2 burnout | ||
| 0753 | D+5:58 Pegasus stage 3 burn | ||
| 0754? | Stage 3 burnout | ||
| 0756 | D+8:07? Pegasus stage 3 sep | 345 x 953 x 97.4 (OSC) | |
| 1996 Jul 3 | 340 x 943 x 97.4 | ||
| 1996 Jul 5 | 97.56 340 x 943 x 97.4 | ||
| 1996 Jul 8 | Orbit raise | ||
| 1996 Jul 11 | 94.67 494 x 511 x 97.4 | ||
| 1996 Jul 25 | 94.66 494 x 510 x 97.4 | ||
| 1996 Aug 23 | 94.67 492 x 512 x 97.4 | ||
| 1997 Mar 15 | 94.61 489 x 509 x 97.4 | ||
| 1997 Dec 4 | 94.51 486 x 503 x 97.4 | ||
| 1997 Dec 6 | orbit raise | 94.96 498 x 535 x 97.57 | |
| 1997 Dec 7 | orbit raise | 95.51 497 x 588 x 97.87 | |
| 1997 Dec 8 | Orbit raise to replace ADEOS | 96.47 582 x 596 x 97.9 | |
| 1997 Dec 15 | orbit raise | 99.65 737 x 746 x 98.4 | |
| 1998 Jan 28 | 99.65 737 x 746 x 98.4 | ||
No comments:
Post a Comment