1978-087A
The EXOS-B spacecraft, Jikiken (Magnetosphere), was launched on 1978 Sep 16 by Mu 3H. It had four long antennae to study magnetospheric fields.
The 92 kg satellite was a domed polyhedral cylinder, 0.75m dia 0.60m high of a different design to the Tansei-3/EXOS-A satellites. EXOS-B had a new, 0.70m dia KM-B kick motor as a fourth stage. Unlike MS-T3, the motor was below the payload at launch and was fired immediately after the third stage, which was suborbital. 30 min later NASA picked up the signal. The antennae were extended, dropping spin rate from 150 to 3 rpm. Actual deployment was to 69.8m and 103.0m span (maximum would have been 206 m span).
KM-B mass is 284 kg f 49? em, 22.6 kN, 0.86m long 0.73m dia, Isp 283s, 30 s burn time. The delta-V calculations suggest a stage 3 orbit of -1000 x 231 km but the impact zone of 160W 10N suggests a trajectory more like -450 x 231 km.
| Jikiken | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1978 Sep 16 | 0500 | Launch by Mu 3H | KASC |
| T+0:08 SOB burnout | |||
| T+0:09 SOB sep | |||
| 0502? | St 1 burnout | ||
| T+1:24 St 1 sep | |||
| T+1:26 St 2 sep | |||
| 0502? | St 2 burnout | -5179 x 233 x 31.1 | |
| 0502? | Fairing top off | ||
| 0502? | Fairing lower part off | ||
| 0505? | Spinup St 3 | ||
| 0505 | T+5:57 St 2 sep | ||
| 0504 | T+4:30 St 3 burn 53s, 224 km (ISAS doc) | ||
| T+5:41 KM burn 33s (ISAS doc) | |||
| 0506 | T+6:02 St 3 burn, 54s | ||
| 0506 | T+6:56 St 3 burnout | -1000? x 231 x 31.1 | |
| 0507 | T+7:12 St 3 sep | ||
| 0507 | T+7:12 KM Kick motor burn | ||
| 0508 | T+8:37 KM sep | 517.9 230 x 30558 x 31.1 | |
| 1978 Sep 25 | Booms deployed | ||
| 1981 | Still operating | ||
Payload:
- 103 m antennae (2) long wave antenna
- 69 m antennae (2)
- 1m vector magnetometer boom
- SPW Stimulated Plasma Waves
- NPW Natural plasma waves
- IEF Impedance Electric Field
- CBE Controlled electron beam emissions
- DPL VLF Doppler propagation expt
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