1995-011A
The Space Flyer Unit was a free flying platform deployed by the expendable H-II launch vehicle and to be retrieved by the Shuttle. It was a precursor to NASDA's involvement in the ISSA project, and was a collaborative project with ISAS, MITI and NASA.
The H-II was launched on 1995 Mar 11 and delivered SFU to orbit. SFU maneuvered to the 486 km mission orbit at 0549 UT on Mar 23. It was planned to be retrieved after 6 months but the Shuttle retrieval was delayed. It was recovered by Space Shuttle Endeavour in Jan 1996.
The SFU satellite was an octagonal bus, 4.7m in diameter and 2.8m high. Its mass at launch was 3486 kg including a fuel load of 759 kg hydrazine. After orbit insertion, two 2.4m wide solar arrays are deployed from the bus for a total span of 24.4m. The monopropellant hydrazine RCS and orbit change thruster system had twelve 23-N thrusters and twelve 3-N thrusters.
Capacity was 100 kg RCS and 650 kg for the OCT system.
One of the main experiments on SFU is the EFFU, which was a test flight of equipment for the JEM Exposed Facility on the Space Station.
The IRTS was an ISAS/NASA experiment in infrared astronomy. The 2D experiment used the miura-ori folding technique to compress a tension stabilized membrane for launch and then deploy it on orbit, creating a roughly 10m diamond shaped array. During retrieval, the solar arrays would not retract correctly and had to be jettisoned.
| SFU | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1995 Mar 18 | 0801 | Launch by H-II | TNSC |
| T+1:16 SSB burnout 25 km 1.3 km/s | |||
| T+1:30 SSB sep 36 km 1.6 km/s | |||
| T+1:34 SRB burnout | |||
| T+1:37 SRB sep 42 km 1.6 km/s | |||
| T+3:39 Upper fairing sep 128 km 2.8 km/s | |||
| T+5:47 MECO | |||
| T+5:56 Stage 1 sep 222 km 5.3 km/s | |||
| T+6:02 Stage 2 SES-1 | -4400 x 250 ? | ||
| 0813 | T+12:20 SECO-1 | ||
| 0814 | T+13:16 SFU separation | ||
| 0817 | T+16:11 Lower fairing sep | ||
| 0826 | T+25:03 SES-2 | ||
| 0828 | T+27:02 SECO-2 | ||
| 0828 | T+27:52 Stage 2 sep from GMS | ||
| 91.05 311 x 340 x 28.5 | |||
| 1995 Mar 19 | 91.23 320 x 349 x 28.5 | ||
| 1995 Mar 20 | 92.09 358 x 395 x 28.5 | ||
| 1995 Mar 21 | 92.15 365 x 394 x 28.5 | ||
| 1995 Mar 23 | Operational orbit | ||
| 1995 Mar 23 | 94.24 466 x 496 x 28.5 | ||
| 1995 Mar 29 | 94.24 467 x 494 x 28.5 | ||
| Begin Mission Operation Phase | |||
| 1995 Mar 29 | EPEX first burn | ||
| 1800 | IRTS FPI on | ||
| 1815 | IRTS sun shield extended | ||
| 1995 Mar 29 | 2359 | IRTS cover ejected | |
| IRTS survey begins | |||
| 1995 Apr 24 | IRTS survey ends | ||
| 1995 Apr 24 | 0855 | He tank venting | |
| 1995 Apr 26 | Helium tank discharged | ||
| 1995 Apr 26 | 0758 | IRTS sun shield ejected | |
| 1995 May 26 | 2DHV deploy test | ||
| 1995 Jul 4 | 94.21 466 x 493 x 28.5 | ||
| 1995 Jul 20 | Residual EPEX hydrazine dumped | ||
| 1995 Aug 3 | 2DHV locked | ||
| 1995 Aug 23 | EPEX hydrazine valves closed | ||
| 1995 Sep | Post Mission Phase | ||
| 1995 Oct 17 | Begin OCT tests | 94.18 464 x 492 x 28.5 | |
| Orbit lower apogee | |||
| 1995 Oct 19 | 94.02 461 x 480 x 28.5 | ||
| 1995 Dec 6 | 94.00 465 x 474 x 28.5 | ||
| Raise orbit | |||
| 1995 Dec 7 | 0920 | 94.15 472 x 483 x 28.5 | |
| 1995 Dec 18 | 94.15 471 x 483 x 28.5 | ||
| Raise orbit | |||
| 1995 Dec 21 | 2052 | 94.33 481 x 491 x 28.5 | |
| Lower orbit | |||
| 1995 Dec 22 | 1102 | 94.08 470 x 478 x 28.4 | |
| 1996 Jan 12 | 94.08 469 x 478 x 28.5 | ||
| 1996 Jan 13 | 0935 | SFU panel 1 ejected | |
| 0947 | SFU panel 2 ejected | ||
| 1057 | OV-105 RMS grapple SFU | ||
| 1139 | RMS berth SFU | ||
| 1150? | RMS ungrapple SFU | ||
| 1996 Jan 18 | 1530 | 94.08 469 x 478 x 28.5 | |
| 1996 Jan 20 | 0742 | Landed aboard OV-105 | |
No comments:
Post a Comment