1985-076D
Leasat 4 was deployed from Discovery on mission 51-I, two days before the salvage of Leasat 3. Celebration over the success of the repairs to Leasat 3 was somewhat dampened in September; although Leasat 4 reached geostationary altitude successfully, the main communications payload went dead shortly afterwards and the satellite was declared a loss. It remained at 178W until 1987, being used for various engineering tests.
| Syncom IV F4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1985 Aug 29 | 1048:55 | Leasat 4 deploy | |
| 1134 | PKM burn | ||
| 1817? | PKM sep | ||
| 1911 | 284.9 371 x 15557 x 27.5 | ||
| 1985 Aug 29 | 2100? | LAM-1 | 356.40 370 x 20175 x 27.3 |
| 1985 Aug 30 | 1500? | LAM-2 | 466.29 365 x 26715 x 27.3 |
| 2240? | LAM-3 | 636.14 392 x 35854 x 27.2 | |
| 1985 Sep 1 | 0100? | LAM-4 | 783.25 6986 x 36550 x 13.0 |
| 1985 Sep 1 | 1400? | LAM-5 | 874.92 11972 x 35875 x 9.9 |
| 1985 Sep 2 | 0430? | LAM-6 | 1134.59 23441 x 35871 x 5.6 |
| 1985 Sep 3 | 2300? | LAM-7 | 1429.55 35446 x 35869 x 3.7 GEO 176.1E+1.6E |
| 1985 Sep 3 | 1431.41 35513 x 35876 x 3.7 GEO 176.1E+1.1E | ||
| 1985 Sep 4 | Comms payload testing begins | ||
| 1985 Sep 11 | 1436.31 35775 x 35806 x 3.5 GEO 177.8E+0.05W | ||
| 1985 Sep | Comms payload failed | ||
| 1985 Sep | GEO 178E | ||
| 1985 Nov 6 | 1436.19 35786 x 35790 x 3.2 GEO 177.0W+0.03W | ||
| 1986 Aug 11 | 1436.26 35783 x 35796 x 2.5 GEO 176.1W+0.05W | ||
| 1987 Mar 29 | 1436.04 35739 x 35831 x 1.9 GEO 177.8W | ||
| 1987 May 26 | mv out | 1436.04 35435 x 36135 x 1.7 GEO 179.6W | |
| 1987 Jun 30 | 1435.88 35698 x 35865 x 1.7 GEO 178.6W+0.05W | ||
| 1989 May 14 | 1434.88 35012 x 36513 x 0.3 GEO 111.4W+0.3E | ||
| 1989 May 22 | orbit raise | 1440.64 35237 x 36513 x 0.3 | |
| 1992 Jul 2 | 1437.24 35799 x 35818 x 2.8 GEO 167.5E+0.3W | ||
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