1993-023A
The STS-56 flight carried the Atlas Spacelab Earth observing payload on its second flight and the Spartan 201 free-flyer solar observatory.
Atlas-2 studied solar energy output, middle atmosphere chemistry, and the ozone layer. The ATMOS obtained atmospheric density profiles for dozens of trace gases up to 140 km, concentrating on the S hemisphere to complement Atlas-1's northern observations. The MAS obtained water, ozone and ClO profiles and the SSBUV measured ozone and also SiO2 pollution. ACR, SOLCON and SOLSPEC obtained the overall solar spectral energy distribution from IR to UV while SUSIM obtained UV data for cross-calibration with UARS.
The SAREX amateur radio system was used for the first Shuttle-Mir communication on Apr 10. An AEM with rodents was also carried in the middeck for life sciences studies.
| STS-56 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1993 Mar 2 | Tow to VAB | ||
| 1993 Mar 3 | ET mate | ||
| 1993 Mar 15 | Rollout | LC39B | |
| 1993 Apr 6 | 0632 | RSLS hold T-11s | |
| 1993 Apr 8 | 0529:00 | Launch from LC39B | |
| 0531:06 | SRB sep | ||
| 0537:34 | MECO | 87.79 31 x 299 x 57.0 | |
| 0537:53 | ET-54 Sep | ||
| 0606:07 | OMS-2 2:30 77m/s | ||
| 0608:37 | OMS-2 CO | 90.42 290 x 299 x 57.0 | |
| 0704 | Open PLBD | ||
| 0919 | Activate Atlas-2 | ||
| 1993 Apr 10 | 1440 | 90.42 292 x 298 x 57.0 | |
| 1993 Apr 11 | 0445 | RMS unstow | |
| 0522 | RMS grapple Spartan | ||
| 0536 | RMS unberth Spartan | ||
| 0611:33 | Deploy Spartan | ||
| 0612? | RCS sep | ||
| 0705 | SPTN at 1 km | ||
| 0729 | 90.46 292 x 301 x 57.0 | ||
| 1359 | 90.47 293 x 301 x 57.0 | ||
| 1993 Apr 12 | 0550 | RCS NSR (Nominal Slow Rate) 1m/s | |
| 0728 | RCS NPC (Nominal Plane Change) 1m/s | ||
| 0939:37 | NC1 (Nominal Correction) OMS-3R phasing 8s 2m/s | 90.36 288 x 296 x 57.0 | |
| 0939:45 | OMS-3 CO | ||
| 1529 | 90.37 288 x 296 x 57.0 | ||
| 1993 Apr 13 | 0514 | RCS burn | |
| 0720:05 | RMS grapple Spartan 201 | ||
| 0801:38 | RMS berth Spartan | 90.41 291 x 297 x 57.0 | |
| 1993 Apr 14 | 0600 | 90.41 291 x 297 x 57.0 | |
| 1993 Apr 15 | 2159 | 90.41 292 x 296 x 57.0 | |
| 1993 Apr 16 | 0445 | Waveoff WX | |
| 0603 | RCS for crossrange 56s 5m/s | 90.24 281 x 291 x 57.0 | |
| 1993 Apr 17 | 0530 | Atlas 2 powerdown | |
| 0800 | PLBD close | ||
| 1034:25 | OMS DO (3:28) 115m/s | ||
| 1037:54 | OMS cutoff | 9 x 300 x 57.0 | |
| 1105:53 | Entry, 122 km | ||
| 1137:19 | Landed RW33 KSC | ||
| 1137:32 | Chute | ||
| 1137:34 | NGTD | ||
| 1138:01 | Chute sep | ||
| 1138:21 | Wheels stop | ||
| 1445 | Tow to OPF/3 | ||
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