OV1-04/05

 1966-025A

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OV1-4 was launched with OV1-5 on the nose of an Atlas D. It carried life sciences experiments for Aerospace Medical Div. at Brooks AFB. A side mounted OAR Pod A-302 was carried as OPS 1049.

For each of OV1-4/5, the Atlas retained pod structure was 0.32m long 1.67m wide and 0.76m deep with a mass of 333 kg. The OV1 satellite was 1.39m long 0.69m dia with a mass of 87 kg, and a 2.05m long 0.72m dia PM of 354 kg mass.

OV1-4
Date	Time	Event	Orbit
1966 Mar 30	0920:12	Launch by Atlas D	V ABRES B3
	0922:24	BECO (T+2:12)
	0925:10	SECO (T+4:58)
	0925:10	SPP ejection
	0925:20	OV1 Pod Door open (T+5:08)
	0925:24	OV1-4, OV1-5 ejected (T+5:12)
	0931:34	OV1-4P burn (T+11:22) 22.8s
	0932:18	OV1-4P cutoff (T+12:06)
	0933:42	OV1-4P sep (T+13:30)	103.9 879 x 1011 x 144.5 (RAE)
1966 Apr 10		Still transmitting

Payload:

• Plant growth expt (free fall effects on photosynthesis and plant growth)

1966-025B

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OV1-5 was launched in Mar 1966; it carried experiments to develop surveillance technology. The spacecraft was also called BORE (Background Optical Radiation Experiment) and studied IR remote sensing technology. The OV1-5 propulsion module ignited two minutes after OV1-4 orbit insertion, presumably to allow a single control center to monitor both launches.

OV1-5 satellite mass was 114 kg.

OV1-5
Date	Time	Event	Orbit
1966 Mar 30	0920:12	Launch by Atlas D	V ABRES B3
	0922:24	BECO (T+2:12)
	0925:10	SECO (T+4:58)
	0925:10	SPP ejection
	0925:20	OV1 Pod Door open (T+5:08)
	0925:24	OV1-4, OV1-5 ejected (T+5:12)
	0935:57	OV1-5P burn (T+15:45)
	0936:43	OV1-5P cutoff (T+16:31)
	0938:05	OV1-5P sep (T+17:55)	105.5 996 x 1048 x 144.7 (RAE)

Payload:

• Optical, UV and 0.5-30 mu IR sensors

• Studies of Earth and background radiation

• 3 Earth pointing, 2 horizon pointing sensors