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astronautix.com Atlas IIA


Family: Atlas. Country: USA. Status: Hardware.

The Atlas II booster was 2.7-meters longer than an Atlas I and included uprated Rocketdyne MA-5A engines. The Atlas I vernier engines were replaced with a hydrazine roll control system. The Centaur stage was stretched 0.9-meters compared to the Centaur I stage. Fixed foam insulation replaced Atlas I's jettisonable insulation panels. Atlas IIA was a commercial derivative of the Atlas II developed for the US Air Force. Higher performance RL10A-4 (or RL10A-4-1) engines replaced Atlas II's RL10A-3-3A engines. RL10A-4 and RL10A-4-1 engines were offered with or without extendable nozzles (Extendible nozzles increased the engines specific impulse, providing additional performance if required). AC-105 / INTELSAT-K, launched 9 June 1992, inaugurated Atlas IIA series flights.


Specifications

Launches: 19. Failures: 0. Success Rate: 100.00% pct. First Launch Date: 10 June 1992. Last Launch Date: 30 June 2000. LEO Payload: 7,280 kg. to: 185 km Orbit. at: 28.5 degrees. Payload: 3,039 kg. to a: Geosynchronous transfer trajectory. Liftoff Thrust: 215,220 kgf. Total Mass: 187,700 kg. Core Diameter: 3.1 m. Total Length: 47.5 m. Launch Price $: 90.00 million. in 1994 price dollars.


Atlas IIA Chronology


1992 Jun 10 - - 00:00 GMT. LV Configuration: Atlas IIA (4N) s/n AC-105 / Centaur II s/n 8105. Launch Site: Cape Canaveral . Launch Complex: LC36B.
1994 Aug 3 - - 23:57 GMT. LV Configuration: Atlas IIA (4N) s/n AC-107 / Centaur II s/n 8107. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1994 Nov 29 - - 10:21 GMT. LV Configuration: Atlas IIA (4N) s/n AC-110 / Centaur II s/n 8109. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1995 Apr 7 - - 23:47 GMT. LV Configuration: Atlas IIA (4N) s/n AC-114 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1995 Jul 31 - - 23:30 GMT. LV Configuration: Atlas IIA (4) s/n AC-118 IABS / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1995 Dec 15 - - 00:23 GMT. LV Configuration: Atlas IIA (4N) s/n AC-120 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1996 Apr 3 - - 23:01 GMT. LV Configuration: Atlas IIA (4) s/n AC-122 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1996 Sep 8 - - 21:49 GMT. LV Configuration: Atlas IIA (1N) s/n AC-123 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36B.
1996 Nov 21 - - 20:47 GMT. LV Configuration: Atlas IIA (1N) s/n AC-124 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1996 Dec 18 - - 01:57 GMT. LV Configuration: Atlas IIA (4) s/n AC-129 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1997 Mar 8 - - 06:01 GMT. LV Configuration: Atlas IIA (1N) s/n AC-128 / Centaur II. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1997 Oct 25 - - 00:46 GMT. LV Configuration: Atlas IIA (4) s/n AC-131. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1998 Jan 29 - - 18:37 GMT. LV Configuration: Atlas IIA s/n AC-109. Launch Site: Cape Canaveral . Launch Complex: LC36A.
1998 Oct 9 - - 22:50 GMT. LV Configuration: Atlas IIA s/n AC-134. Launch Site: Cape Canaveral . Launch Complex: SLC36B.
1998 Oct 20 - - 07:19 GMT. LV Configuration: Atlas IIA s/n AC-130. Launch Site: Cape Canaveral . Launch Complex: SLC36A.
1999 Nov 23 - - 04:06 GMT. LV Configuration: Atlas IIA s/n AC-136. Launch Site: Cape Canaveral . Launch Complex: SLC36B.
2000 Jan 21 - - 01:03 GMT. LV Configuration: Atlas IIA s/n AC-138. Launch Site: Cape Canaveral . Launch Complex: SLC36A.
2000 May 3 - - 07:07 GMT. LV Configuration: Atlas IIA s/n AC-137. Launch Site: Cape Canaveral . Launch Complex: SLC36A.
2000 Jun 30 - - 12:55 GMT. Launch Site: Cape Canaveral . Launch Complex: zzSLC36A.

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Last update 12 March 2001.
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