Launch of the last Atlas H with NOSS-9.
|Function||Expendable launch system|
|Country of origin||United States|
|Launch sites||SLC-3E, Vandenberg|
|First flight||9 February 1983|
|Last flight||15 May 1987|
The Atlas H was an American expendable launch system derived from the SM-65 Atlas missile. It was a member of the Atlas family of rockets, and was used to launch five clusters of NOSS satellites for the US National Reconnaissance Office. Two flights also carried LIPS satellites, as secondary payloads for the United States Naval Research Laboratory.
The Atlas H was a stage and a half rocket, using the enhanced Atlas rocket designed for use as the first stage of the Atlas G rocket, which differed from the Atlas H in having a Centaur upper stage. This stage was later reused as the first stage of the Atlas I. In practice, an MSD upper stage was flown on all five launches.
Atlas H could put a LEO Payload of 3,630 kg (8,000 lb). A payload of 2,255 kg (4,971 lb) to a GTO. 
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