ESSA 7

  1968-069A

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The alternation of APT and AVCS satellites continued with TOS E (ESSA VII). It was launched from Vandenberg on 1968 Aug 16 at 1124 by the new two stage Delta N vehicle with the Long Tank Thor first stage. This was regarded as the first operational two burn mission. 

ESSA 7
Date	Time	Event	Orbit
1968 Aug 16	1124:33	Launch by Delta N	V
		Castor 2 SRM sep
	1128	T+3:40 MECO
		Stage 1 sep
	1128	SES-1 6:04
	1134	SECO-1	187? x 1470 x 101.7
	1226?	SES-2
	1226?	SECO-2
	1227?	Stage 2 sep	1432 x 1476 x 101.7
	1228?	Despin
		Replaced ESSA 5
1970 Mar 10		End of tx