1972-073A
IMP H (Interplanetary Monitoring Platform H) was the first of a new series of IMP probes placed in distant circular orbits. The IMP H series carried a Star 17A apogee motor to circularize the orbit. The probe, which became Interplanetary Monitoring Platform 7 (Explorer 47), was launched at 0120 on 1972 Sep 23 by Delta 1604 from Cape Kennedy. The Delta delivered the probe to a 153 x 411 km x 28.8 deg parking orbit at 0126. After an 11 min coast the Star 37E third stage ignited at 0137 and placed IMP VII in a 248 x 254800 km x 28.6 km orbit. The Star 17A solid motor fired at first apogee placing IMP 7 in a 201100 x 235600 km x 17.2 deg orbit. The satellite operated until 1978 Oct 31 when it was switched off.
Mass was 390 kg launch 1.58m high 1.36m dia. 16-sided cylinder with two 3.4m experiment booms and two 1.2m attitude control system booms for an estimated span of 8.2m. Star 17A was 124 kg full 12 kg empty 0.71m dia. The Delta 1604 introduced the extended long tank booster.
| IMP 7 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1972 Sep 23 | 0120:00 | Launch by Delta 1604 | CC |
| 0120:00 | T+0:00 SRM 1-6 burn | ||
| 0120:39 | T+0:34 SRM 1-6 burnout | ||
| 0121:25 | T+1:25 SRM sep | ||
| 0124:28 | T+4:28 MECO | ||
| 0124:34 | T+4:34 VECO | ||
| 0124 | T+4:36 St 1 (S/N 20006) sep | ||
| 0124:40 | T+4:40 SES-1 | ||
| 0124:57 | T+4:57 Fairing sep | ||
| 0130:12 | T+10:12 SECO-1 | 153 x 411 x 28.8 | |
| 0135:31 | T+15:31 St 2 sep | ||
| 0135:45 | T+15:45 Star 37C burn 43.6s | ||
| 0136:27 | T+16:27 Star 37C burnout | ||
| 0138:09 | T+18:09 Star 37C sep | 248 x 254800 x 28.6 | |
| 0138:11 | Star 37C yo weight release | ||
| 247 x 237796 x 28.6 (MOR Post) | |||
| 1972 Sep 23 | 1815 | Pass EL1:4 | |
| 1972 Sep 25 | 1536 | Star 17A burn | |
| Star 17A burnout | 201100 x 235600 x 17.2 | ||
| 1930? | ACS burn to reduce spin rate | ||
| Boom deploy | 207836 x 235558 x 17.72 (FFR) | ||
| 1972 Sep 26 | Begin experiment turnon | ||
| 1978 Sep 30 | end of operations (TM-80758) | ||
| 1978 Oct 31 | end of tx | ||
Payload:
- H1 Magnetometer (GSFC/Ness)
- H2 Electric and magnetic fields (TRW/Scarf) Plasma Wave Experiment, AC Electric and magnetic fields (TRW/Scharf), 3.1m boom with loop antenna and 61cm dipole antenna
- H3 LASL electrostatic analyser (LASL/Bame) e 4 eV-20 keV, p 70 eV -20 keV.
- H4 Faraday cup (MIT/Bridge) e 17 ev-7 keV, p 50 eV-7 keV.,
- H5 GSFC electrostatic analyser (GSFC/Olgivie)
- H6 Crystal scintillator (GSFC/Cline) Solar Electrons and solar flare X-rays (GSFC/Cline), e 100 keV-2 MeV; X-rays 20 keV-1 MeV
- H7 LEPEDEA (Iowa/Frank)
- H8 U Md. SSD (UMd/Gloeckler) Ions and electrons, electrostatic analyser
- H9 SS and GM detectors (APL/Krimigis)
- Solar and galactic X-ray detector 1.75-16A with GM tubes
- H10 SS and Scint. telescopes (GSFC/McDonald)
- H11 Chicago solid state telescope (Chicago/Simpson)
- H12 CIT solid state telescope (CIT/Stone) Electrons and Isotopes, solid state telescope 0.16-2.8 Mev e, 0.5-40 Mev/n (Caltech/Stone)
