1973-078A
The final IMP satellite was IMP J (Interplanetary Monitoring Platform J), which became Interplanetary Monitoring Platform 8 (Explorer 50) after launch. Launch was at 0226:02 on 1973 Oct 26, by Delta 1604 from Cape Kennedy. The Star 37E separated at 0238 and left the IMP in a 197 x 228809 km x 28.8 deg. The TE-M-521 (Star 17A) motor fired at the first apogee, at 0600 on Oct 29, but did not provide as much thrust as planned, and IMP 8 entered a 141185 x 288857 km x 28.7 deg orbit. It was still operating in 1998, with special measures taken to process its VHF telemetry after the STDN tracking network was closed down.
| IMP 8 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1973 Oct 26 | 0226:03 | Launch by Delta 1604 | CK LC17B |
| T+0:38 SRM 1-6 off | |||
| T+1:15 SRM sep | |||
| T+4:29 MECO | |||
| T+4:33 Stage 1 sep | |||
| 0230 | T+4:37 SES-1 5:27 | ||
| T+4:55 Fairing | |||
| 0236:04 | T+10:01 SECO-1 | ||
| 0237:20 | T+11:17 St 2 sep | 154 x 521? x 28.7 (78B orbit) | |
| 0237:33 | T+11:30 TES 43s | ||
| 0238:15 | T+12:12 TECO | ||
| 0239:57 | T+13:55 Star 37 sep | 197 x 228809 x 28.8 | |
| 0258? | SES-2 experimental | ||
| SECO-2 (78C orbit) | 360 x 2326 x 28.9 | ||
| 1956 | Pass EL1:4 | ||
| 1973 Oct 29 | 0600 | AKM burn | |
| 1973 Oct 29 | 0800 | 141185 x 288857 x 28.67 | |
| 1975 Jul 25 | 17287.48 215092 x 215092 x 19.7 | ||
| 1978 Jul 20 | 17375.79 177677 x 254023 x 40.63 | ||
| 1984 Apr 14 | 17550.98 190940 x 243718 x 43.3 | ||
| 1998 May 21 | 17576.75 190893 x 244218 x 31.8 | ||
| 1998 Oct 25 | Still operating | ||
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