Landsat 4

 1982-072A

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General Electric was given a contract to develop a new series of Landsat satellites. Landsat D used Fairchild's MMS bus (also used for Solar Max). Landsat D (Landsat 4) was launched at 1759 on 1982 Jul 16 by Delta 3920 from Vandenberg. The Delta reached transfer orbit at 1810, and restarted for a 13 second circularization burn at 1853. Landsat 4 separated into a 699 x 714 km x 98.3 deg orbit. The MMS had its own propulsive capability and by Aug 1 the orbit had been refined to 702 x 706 km. The orbit had a 0945LT equator crossing.

Landsat 4 was turned over to NOAA in Feb 1983; meanwhile on 1983 Feb 15 the thematic mapper instrument failed. In 1985 operations were transferred to EOSAT (although the government retained ownership, via NOAA until 1998 when USGS took over the contract management). In Oct 1993 the satellite was inactive but still transmitting. The satellite was finally retired in Jun 2001.

Landsat 4
Date	Time	Event	Orbit
1982 Jul 16	1759	Launch by Delta 3920
		T+0:57 SRM 1-6 off
		T+1:08 SRM 1-6 sep
		T+2:03 SRM 7-9 sep
		T+3:46 MECO
		T+3:54 St 1 sep
	1803	T+4:00 SES-1 6:50
	1803	T+4:05 Fairing
	1809	T+10:51 SECO-1	150? x 700 x 98.3
	1810	T+11:40 coast attitude
	1847	T+48:11 SES-2 14.6s
	1847	T+48:26 SECO-2
	1852	T+53:17 St 2 sep	98.93 699 x 714 x 98.3
	1937?	SES-3 depletion	95.15 357 x 694 x 101.8
1982 Jul 17			684 x 700 x 98.3
1982 Jul 26		Orbit raise
1982 Jul 27			701 x 703 x 98.3
1982 Aug 1			702 x 706 x 98.3
1985 Sep 27		Operations to EOSAT
2001 Jun 5			98.83 698 x 707 x 98.3
2001 Jun 7			97.97 659 x 664 x 98.3
2001 Jun 14			96.81 594 x 618 x 98.3
2001 Jun 15		Decommissioned	96.48 583 x 597 x 98.3