1977-102A
The ISEE A `Mother' satellite was one of a pair designed to study the magnetosphere. It was launched together with the European Space Agency's ISEE B `daughter' satellite on 1977 Oct 22 at 1353 by a Delta 2914 from Cape Canaveral and received the post launch name International Sun-Earth Explorer 1. The Delta delivered the satellites into a 337 x 137904 km x 29.0 deg orbit. The satellite was still operating when it reentered on 1987 Sep 26.
| ISEE 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1977 Oct 22 | 1353:00 | Launch by Delta 2914 | CC |
| T+0:38 SRM 1-6 out | |||
| T+0:39 SRM 7-9 on | |||
| T+1:18 SRM 7-9 out | |||
| T+1:27 SRM 1-9 sep | |||
| 1357? | T+3:45 Thor MECO at 91 km | ||
| T+3:54 Thor sep at 96 km | |||
| 1357? | T+3:56 Delta SES-1 4:48 at 99 km | ||
| T+4:56 Fairing 126 km | |||
| 1401:44 | T+8:44 Delta SECO-1 157 km | 157? x 285? x 28.8 | |
| 1446:31 | T+53:31 Delta SES-2 21s 285 km | ||
| 1446:52 | T+53:52 Delta SECO-2 | ||
| T+54:50 Spinup | |||
| 1447:52 | T+54:52 Delta sep | 95.84 276 x 842 x 28.74 | |
| 1448 | Delta perigee over 22S 115E from elset 1 | ||
| 1448:33 | T+55:33 TES | ||
| 1449:17 | T+56:17 TECO 287 km | ||
| 1450:30 | Stage 3 sep T+57:30 | ||
| 1455? | ISEE-B sep from ISEE-A | ||
| 1500 | Delta ascending node from elset 1 | ||
| 1504? | ISEE A perigee over 22S 115E from elset 1 | ||
| 1987 Sep 26 | 0640? | Reentry over Brazil 38W 7S? | |
International Sun-Earth Explorer 2, the ISEE B `Daughter' satellite, was built by STAR/Dornier-Freidrichsafen for the European Space Agency. It was launched on 1977 Oct 22 by a Delta 2914 from Cape Canaveral together with NASA's ISEE 1 satellite. The initial orbit was 341 x 137847 km x 29.0 deg. ISEE 2 was designed to measure magnetospheric and solar wind properties close in space and time to ISEE 1 for comparative purposes. In 1979 Oct its onboard thrusters were used to adjust the orbit and re-approach the ISEE 1 satellite. The perigee increased to a maximum of 3300 km around Jan 1980 and then decreased to 300 km or so around Mar 1982 before increasing again to a new maximum of over 6000 km in early 1985 and decreasing again until reentry. ISEE 2 was still transmitting when it reentered on 1987 Sep 26.
| ISEE 2 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1977 Oct 22 | Launch by Delta 2914 | CC | |
| 1977 Oct 28 | 3438.71 340 x 137837 x 29.0 | ||
| 1977 Nov 29 | 3442.61 780 x 137511 x 30.4 | ||
| 1978 Apr 9 | 3441.79 441 x 137826 x 37.1 | ||
| 1978 Aug 2 | 3439.08 1413 x 136775 x 41.2 | ||
| 1979 Jan 25 | 3439.05 2305 x 135882 x 47.1 | ||
| 1979 Mar 24 | 3439.18 1927 x 136263 x 49.5 | ||
| 1979 late | Maneuvers | ||
| 1979 Sep 1 | 3441.33 2669 x 135585 x 51.6 | ||
| 1980 Apr 10 | 3440.99 2664 x 135580 x 53.2 | ||
| 1980 Jun 28 | 3441.16 3284 x 134965 x 51.7 | ||
| 1982 Apr 3 | 3439.82 703 x 137506 x 37.3 | ||
| 1983 Apr 20 | 3440.40 1675 x 136552 x 27.4 | ||
| 1985 Jan 30 | 3440.93 6321 x 131921 x 31.1 | ||
| 1986 Jun 4 | 3439.83 3992 x 134218 x 27.5 | ||
| 1987 Sep 21 | 3438.78 224 x 137956 x 8.7 | ||
| 1977 Sep 26 | 0643? | Reentry over Brazil 44W 7S? | |
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