1985-001A
The fifth technology satellite, MS-T5, was the test payload on the first Mu-3S-II launch vehicle. It was placed in solar orbit and named Sakigake (`Pioneer'):
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Although given an MS-T designation, it was basically identical to the Planet A spacecraft.
Sakigake passed 6.9M km from Halley. KM-P passed 7.6M km from Halley.
In the mid 1990s a flyby of 45P/HMP was planned on 1996 Feb 4 at 10000 km. Orbital reconstruction shows a close pass of less than 0.1AU on Feb 11, but my data are not accurate enough to determine the true encounter distance. Sakigake ran out of fuel in 1995 (with communications lost in 1999 according to the ISAS web page). A further encounter, with Giacobini-Zinner planned in Nov 1998 was called off.
| Sakigake | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1985 Jan 7 | 1926 | Launch by Mu-3S2-1 | KASC |
| T+0:40 SOB sep | |||
| T+1:24 Stage 1 cutoff, sep | |||
| T+1:26 Stage 2 start | |||
| T+2:36 Stage 2 cutoff, coast | |||
| T+2:35 Fairing | |||
| 1929 | T+3:15 Stage 3 spinup | ||
| 1930 | T+4:06 Stage 2 sep | ||
| 1930 | T+4:08 Stage 3 burn 87s | ||
| 1931 | T+5:35 M3B rocket cutoff | ||
| 1932 | T+6:03 M3B sep | 215 x 1131 x 31.1 | |
| 1932 | T+6:05 KM-P burn 44s | ||
| 1932 | T+6:49 KM-P cutoff, escape | 250 x Inf x 31.2 | |
| 1933 | T+8:20 KM-P sep | ||
| 1943 | RCS despin | ||
| 1985 Jan 8 | 0508 | Pass EL1:4 | |
| 1985 Jan 9 | RCS despin | ||
| 1985 Jan 11 | TCM-1 29m/s | ||
| 1985 Jan 13 | 1118 | Pass L1 | |
| 1985 Jan 14? | Solar orbit | 0.81 x 1.01 AU 318.6d | |
| 1985 Feb 14 | TCM-2 5m/s | ||
| 1986 Mar 11 | 0420? | Passed 6.9 Mkm from P/Halley | |
| 1987 Jan 25 | Begin TCM burns | ||
| 1987 Jan 28 | 2203 | 3.3 m/s TCM, 1992 targeting | |
| 1987 Jan 29 | 0059 | 3.3 m/s | |
| 0249 | 3.3 m/s | ||
| 1987 Jan 29 | Final TCM, total 37 m/s | ||
| 1989 Jan? | In hibernation | ||
| 1991 Jul 9 | Reactivated | ||
| 1992 Jan | 316.2d 0.799 x 1.017 AU x 1.52 | ||
| 1992 Jan 2 | 2100? | Enter Earth sphere | |
| 1992 Jan 3 | At 1Mkm | ||
| 1992 Jan 8 | 0414 | Pass EL1:4 inbound | |
| 1992 Jan 8 | 1408:47 | Earth flyby 1, 88997 km ctr | |
| 1992 Jan 9 | 0004? | Pass EL1:4 outbound | |
| 1992 Jan 14 | 0720? | Leave Earth sphere | |
| 1992 Jan 13 | At 1 Mkm | ||
| 1992 Feb | 382.8d 0.916 x 1.154 AU x 0.07 | ||
| 1993 Jun 14 | Earth flyby 2, 40Re geotail passage | ||
| 255000 x Inf | |||
| 1994 Oct 28 | Earth flyby 3 86Re | 548000 x Inf | |
| 1995 Oct 27 | ? | Earth flyby 4 at 14Re | 89000 x Inf |
| 1995 Nov 15 | End of comm? | ||
| 1996 Feb 11? | P/Honda-Mrkos-Pajdusakova encounter 10000 km? | ||
| 1999 Jan 7 | end of ops | ||
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