1972-064A
ISAS's Radio Exploration Satellite (REXS) was launched in 1972 and renamed Denpa (Radio wave). It studied the ionosphere and lower magnetosphere but failed after 3 days. Switch on of the EBA caused electrical discharges which toasted the spacecraft encoder. The radio beacon continued to operate until May 1973. REXS was a 70 kg, octagonal cylinder 0.68 h 0.71 dia with three 2m antennas.
M-4S-2 Mass of stage 4 plus payload is 525 f 145 em. Prop mas 380 kg. Payload mass 75 kg implying M-40 is 450f 70 em. Isp 276.0s?
| Denpa | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1972 Aug 19 | 0240 | Launch by Mu-4S-4 | KAG |
| T+0:07 SB burnout | |||
| T+0:09 SB sep | |||
| T+1:01 St 1 burnout | |||
| T+1:21 Upper fairing sep | |||
| T+1:22 Lower fairing sep | |||
| T+1:23? St 1 sep | |||
| 0241 | T+1:26? St 2 burn | ||
| T+2:32? St 2 burnout | |||
| T+2:42? St 2 sep | |||
| T+2:43? St 3 burn | |||
| T+3:25? St 3 burnout | |||
| 0243? | T+3:45? St 3 sep, 300 km | -4202 x 282 x 31.04 | |
| T+6:28? | Stage 4 burn | ||
| 0247 | T+7:08 Stage 4 cutoff | ||
| 0247 | T+7:08 Stage 4 sep (Marman clamp) at 8.897 km/s, 287 km | ||
| 156.9 245 x 6291 x 31.0 | ||
| 1972 Aug 22 | 0007 | EBA switch on | |
| 1980 May 19 | Reentered | ||
Payload:
- IPS Impedance Probe for Satellite, gyro-plasma probe.
- IPH High Freq gyro-plasma probe 0.2-15 MHz
- IPL Low Freq gyro-plasma probe 0.3-15 kHz
- IPS CAL Frequency cal circuits
- CIE Cyclotron Instability Experiment
- TEL Electron Temperature Probe
- MGS Fluxgate magnetometer
- EBA Electron Beam Analyser
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