1997-074B
Hikoboshi (ETS-7) tested space robotics and automatic rendezvous and docking. It has twin solar array wings, a tracking antenna, and a small manipulator arm. It includes a small target subsatellite, Orihime. Mass is 2480 kg for the main satellite.
The orbit was 550 x 550 km x 35 deg after orbit raising burns from the 350 km TRMM deployment orbit. The NASDA satellite is developed and integrated by Toshiba Aerospace; the docking mechanism was developed by Mitsubishi. Control of the mission was from Tsukuba, as a joint operation by NASDA and DARA. The ETS-7 main satellite is also called Hikoboshi (`Altair') after a legendary character associated with the star Alpha Aql. The two satellites together are called Kiku-7.
The main satellite is 2.6 x 2.3 x 2.0 m, with a mass of 2540 kg including 200 kg of fuel. It has two 1.8 x 10 m solar arrays for a span of around 23m. After launch, a solar panel drive malfunctioned temporarily, delaying raising of the orbit. The satellite then went into spinning safemode. ETS-7 had continuing problems with its attitude control system. There was some initial confusion about tracking of these objects.
| SATCAT | Desig | Original ID | Real ID |
| 1997-74A | TRMM | TRMM | |
| 25064 | 1997-74B | ETS-7 Chaser | ETS-7 |
| 25065 | 1997-74C | ETS-7 Target | Adapter |
| 1997-74D | H-II rocket | H-II rocket | |
| 1997-74E | - | Target |
ETS-7 drifted 15 km from the target, and then was to carry out an automatic rendezvous and docking using a robotic manipulator arm.
In Mar 1998 a report admitted that ETS-7's manipulator arm, intended to grapple the target satellite, was installed 30 degrees off from the intended position. Further, the failure of the COMETS satellite meant that NASA's TDRS satellite had to be used for communications relay. Nevertheless the experiments were largely completed in mid 1998. The spacecraft's orbit was adjusted in 2000 and 2001; after Dec 2001 it seems to have been retired.
| ETS-7 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1997 Nov 27 | 2127 | Launch by H-II 6F | TNSC |
| T+1:34 SRB burnout | |||
| T+1:37 SRB sep | |||
| T+3:35 Fairing | |||
| T+5:46 MECO | |||
| T+5:54 Stage 1 sep | |||
| T+6:00 Stage 2 burn | |||
| 2140 | T+13:34? SECO | ||
| 2141 | T+14:12 TRMM sep from H-II | 365 x 385 x 35.0 | |
| 2145? | Adapter sep | ||
| 2152? | SES-2 | ||
| SECO-2 | |||
| 2155 | T+28:01 ETS-7 sep | ||
| 1997 Nov 28 | Solar array drive problem | ||
| 93.74 376 x 538 x 35.00 | |||
| 1997 Nov 29 | Solar arrays operational | ||
| 1997 Nov 30 | Safemode | ||
| 93.77 377 x 540 x 35.0 | |||
| 1997 Dec 15 | 1155 | 93.88 392 x 536 x 35.0 | |
| Orbit raise | |||
| 1997 Dec 16 | 0415 | 94.56 453 x 540 x 35.0 | |
| Orbit raise | |||
| 1997 Dec 17 | 0040 | 95.14 505 x 544 x 35.0 | |
| 1997 Dec 19 | 0113 | 95.14 505 x 544 x 35.0 | |
| Orbit raise | |||
| 0452 | 95.58 546 x 547 x 35.0 | ||
| 1998 Feb 5 | Attitude control error | ||
| 1998 Jun 30 | 95.53 543 x 545 x 35.0 | ||
| 1998 Jun 5 | Unlatched from target | ||
| Range 2 cm | |||
| T+1min relatched | |||
| 1998 Jul 6 | 2209 | Undocked, FP-1 experiment | |
| Range 2m | |||
| 2230 | T+15min redocked | ||
| 1998 Aug 6 | 1800 | Undocked FP-2 experiment | |
| 1900? | Sep to 500m on Vbar | ||
| 2000? | Begin approach on Vbar | ||
| 2015 | Chaser safemode | ||
| Failed to redock | |||
| 1998 Aug 7 | Sep to 4.5 km | ||
| 1998 Aug 7 | 1805 | TCM 0.02m/s at 3.5km | |
| 1949 | TCM 0.1m/s at 4km | ||
| 2352 | At 1500m | ||
| 1998 Aug 8 | 0215 | Approach to 400 m | |
| abort to 2 km | |||
| 1998 Aug 12 | 1759 | Begin approach 3 | |
| 1998 Aug 13 | 0554 | Rendezvous at 500m | |
| 1219 | Approach to 145m | ||
| 1219 | Hikoboshi attitude control problem, safemode | ||
| Stationkeep at 1200m | |||
| 1998 Aug 14 | 95.51 542 x 544 x 35.0 | ||
| 1998 Aug 25 | 2027 | Begin approach retry-1 | |
| 1998 Aug 26 | 0511 | Rendezvous at 500m | |
| 0825 | Approach to 150m | ||
| 0825 | abort to 2km | ||
| 0958 | Stationkeep at 1700m | ||
| 1998 Aug 27 | 0112 | Approach to 450m | |
| 0214 | abort to 550m | ||
| 0725 | Recover at 700m | ||
| 0900 | TF injection at 350m | ||
| 1130 | At 150m, radar acq | ||
| 1308 | Approach to 30m | ||
| 1998 Aug 27 | 1343 | Orihime docked | |
| 1999 Feb 4 | 95.41 537 x 538 x 35.0 | ||
| 1999 Mar 24 | Robot arm experiment: Orihime grappled by arm | ||
| 2121 | Unberth Orihime | ||
| 2205 | Reberth Orihime | ||
| 2303 | Unberth Orihime | ||
| 2347 | Reberth Orihime | ||
| 1999 Mar 25 | 0045 | Unberth Orihime, to 0.3m | |
| 0129 | Reberth Orihime | ||
| 1999 Aug 31 | Orihime released - 0.2m | ||
| 1999 Sep 1 | Orihime recaptured by arm | ||
| 1999 Oct 20 | 95.21 525 x 531 x 35.0 | ||
| 1999 Oct 25 | Approach/Release Flight Tech Test | ||
| 1999 Oct 25 | 2013:30 | Orihime undocked | |
| Sep to 2.0m | |||
| 2041 | Hikoboshi sep, to 9km | ||
| 2330 | Arrive at 9km TI location | ||
| 1999 Oct 26 | 0940 | Hikoboshi begin -R-bar rendezvous | |
| 1121 | Hikoboshi at 700m R-bar | ||
| 1205 | Hikoboshi sep, collision avoid test | ||
| 1302 | 5 km from Orihime | ||
| 1952 | Hikoboshi begin approach | ||
| 1999 Oct 27 | 0616 | begin rendezvous at 230m | |
| 0744 | V-bar at 200m | ||
| 0927 | V-bar at 120m | ||
| 1999 Oct 27 | 1108 | Final approach at 40m | |
| 1999 Oct 27 | 1143 | Orihime docked | |
| 1999 Oct 28 | 95.20 527 x 529 x 35.0 | ||
| 1999 Dec 16 | Mission complete, in monitor mode | ||
| 2000 Mar 19 | 95.26 528 x 533 x 35.0 | ||
| 2000 Jun 14 | 95.10 522 x 524 x 35.0 | ||
| 2000 Jun 15 | Begin orbit raise | ||
| 2000 Jun 21 | 95.58 545 x 547 x 35.0 | ||
| 2001 May 8 | 95.13 523 x 525 x 35.0 | ||
| 2001 May 10 | Orbit raise | 95.58 545 x 547 x 35.0 | |
| 2001 Dec 16 | 95.27 528 x 534 x 35.0 | ||
| 2001 Dec 23 | Orbit raise | 95.58 546 x 547 x 35.0 | |
| 2005 Jan 28 | 94.68 500 x 505 x 35.0 | ||
| 2008 Oct 1 | 94.43 490 x 492 x 35.0 | ||
| 2015 Nov 12 | 88.37 192 x 195 x 34.9 | ||
Payload:
- Space Robotics Experiment System
- Manipulator arm (Space robotics experiment)
- Advanced robotics hand
- Rendezvous and Docking Experiment System
- RVR Rendezvous laser radar
- PXS Proximity sensor
- GPSR Precision GPS receiver
- Docking system
The 410 kg ETS-7 Target subsatellite was released in orbit from ETS-7. It is named Orihime (`Vega') after a legendary character associated with the star Alpha Lyr. The satellite is 1.7 x 1.5 x 0.7m with a single 6.6 x 1.2m solar panel for a span of around 8m.
The FP-2 docking test in Aug 1998 ran into thruster problems, but after several nervous weeks the two spacecraft redocked safely. In early 1999 tests with the robotic arm were carried out. In Mar 1999 thruster tests attempted to track down the cause of the FP-2 problems.
In Oct 1999, an Approach/Release Flight Technology Test tested rendezvous controlled from Earth.
| Orihime | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1998 Jul 6 | 2209 | Undocked, FP-1 test | |
| Range 2 m | 95.5 544 x 545 x 35.0 | ||
| 2245 | Redocked | ||
| 1998 Aug 6 | 1800 | Undocked, FP-2 test | |
| 1940 | Attitude control problem, range 525m | ||
| Redock cancelled | |||
| Range 2.4 km | |||
| 1998 Aug 7 | 0500 | Range 5 km | |
| 1998 Aug 7 | 95.52 543 x 544 x 35.0 | ||
| 1998 Aug 8 | Redock cancelled | ||
| 1998 Aug 9 | Redock aborted at 110m | ||
| Stationkeep 5 km | |||
| 1998 Aug 13 | Redock aborted at 145m | ||
| Stationkeep 1.2km | |||
| 1998 Aug 25 | Redock aborted | ||
| Redock aborted | |||
| 1998 Aug 27 | 95.51 543 x 544 x 35.0 | ||
| 1998 Aug 27 | 1343 | Docked | 95.51 542 x 544 x 35.0 |
| 1999 Mar 1 | Begin thruster tests | ||
| 1999 Mar 5 | Thruster test | ||
| 1999 Mar 9 | Thruster test | ||
| 1999 Mar 11 | Thruster test | ||
| 1999 Oct 25 | 2003 | Undocked | |
| 1999 Oct 26 | 1200? | Rendezvous at 5km | |
| 1999 Oct 27 | 1142 | Docked | |
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