1981-018A
The final Comstar satellite was launched in 1981. G. Falworth's newsletter reported an apogee burn time of 2336 UTC Feb 24, but the post launch MOR reported a Feb 23 burn and the TLEs prefer a burn around 2130 UTC on Feb 24.
In late 2001 D4 was relocated over 69E after purchase by SSC Parallax as Parallax 1. In Apr 2002, Tongasat (Friendly Islands Satellite Communication Ltd ) bought the satellite and renamed it Esiafi 1. The satellite began to drift off station in early 2004, and oscillated between 70E and 80E. In 2011 Tongasat still claimed to be operating the satellite but it is not clear whether the vehicle was really still active.
| Comstar D4 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1981 Feb 21 | 2323 | Launch by Atlas Centaur | LC36A |
| Azimuth 101 deg | |||
| T+2:23 Booster sep | |||
| T+3:33 Fairing | |||
| T+4:17 SECO | |||
| T+4:19 Atlas sep | |||
| T+4:25 MES-1 5:02 | |||
| 2332 | T+9:35 MECO-1 | 180? x 1800? x 27.0 | |
| 2346 | T+23:42 MES-2 1:24 | ||
| 2348 | T+25:06 MECO-2 | 554 x 36526 x 20.7 | |
| 2351 | T+28:34 Centaur sep | ||
| T+30:31 Centaur venting | 636 x 36345 x 20.4 | ||
| 1981 Feb 22 | 652.27 552 x 36518 x 20.7 | ||
| 0600? | Apo 1 over 85E | ||
| 1600? | Apo 2 over 80W | ||
| 1981 Feb 23 | 0300? | Apo 3 over 120E | |
| 1400? | Apo 4 over 40W | ||
| 1981 Feb 23 | 2336? | SVM-4A apogee firing 42s | |
| 1981 Feb 24 | 0030 | Apo 5 over 150E | |
| 1200? | Apo 6 over 10W | ||
| 2230 | Apo 7 over 178W | ||
| 1981 Feb 24 | 2136? | SVM-4A apogee firing 42s | |
| 1981 Feb 24 | 2336? | SVM-4A apogee firing 42s | |
1981 Mar 3 | 1425.91 35385 x 35788 x 0.2 GEO 147.9W+2.5E | ||
| 1981 Mar 9 | 1435.30 35385 x 35788 x 0.2 GEO 142.6W+0.2E | ||
| 1981 Mar 12 | 1436.07 35146 x 36426 x 0.3 GEO 140.2W | ||
| 1981 Mar 22 | 1436.19 35771 x 35805 x 0.3 GEO 142.2W | ||
| 1981 Apr 14 | 1436.07 35774 x 35798 x 0.3 GEO 142.5W | ||
| 1981 Apr | Move to 127W | ||
| 1981 May 4 | 1436.14 35777 x 35797 x 0.2 GEO 127.3W | ||
| 1982 Jan | GEO 127W | ||
| 1983 Oct 6 | 1436.07 35783 x 35788 x 0.1 GEO 127.0W | ||
| 1984 Jan | GEO 127W | ||
| 1985 Sep | Ownership to AT&T; | GEO 127W | |
| 1985 Sep 9 | 1436.08 35783 x 35789 x 0.0 GEO 127.1W | ||
| 1985 Sep | Move to 75W | ||
| 1985 Oct 17 | 1435.97 35778 x 35789 x 0.2 GEO 75.3W | ||
| 1985 Nov | GEO 76W | ||
| 1986 Mar 26 | 1436.20 35785 x 35791 x 0.2 GEO 75.5W | ||
| 1990 Aug 18 | 1436.17 35784 x 35791 x 4.3 GEO 76.0W | ||
| 1992 Aug 5 | 1436.14 35786 x 35788 x 6.1 GEO 76.0W | ||
| 1994 Dec 17 | 1436.07 35782 x 35789 x 7.9 GEO 76.0W | ||
| 1997 Feb 24 | 1436.08 35774 x 35798 x 9.2 GEO 75.9W | ||
| 1999 Apr 23 | 1436.11 35784 x 35789 x 10.3 GEO 75.9W | ||
| 2001 Jul 4 | GEO 76W | ||
| 2001 Jul 20 | Move out | ||
| 2001 Dec | Arrive at 70E | ||
| 2001 Dec 3 | 1436.06 35772 x 35799 x 11.2 GEO 70.3E | ||
| 2003 Sep 1 | 1436.04 35770 x 35800 x 11.8 GEO 70.3E | ||
| 2004 Jan | Begin drift between 70E and 80E. | ||
| 2004 Aug 7 | 1435.95 35773 x 35793 x 12.4 GEO 78.9E+0.03E | ||
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