II: December 7, 1991 IIA: June 10, 1992 IIAS: December 16, 1993
Last flight
II: March 16, 1998 IIA: December 5, 2002 IIAS: August 31, 2004[2]
Type of passengers/cargo
SOHO (Atlas IIAS) TDRS (Atlas IIA)
Stage info
Boosters (Atlas IIAS) – Castor 4A
No. boosters
4
Powered by
1 Solid
Maximum thrust
478.3 kN (107,500 lbf)
Specific impulse
266 s (2.61 km/s)
Burn time
56 seconds
Propellant
HTPB[3]
Boosters (all) – MA-5A
No. boosters
1
Powered by
2 RS-56-OBA
Maximum thrust
2,093.3 kN (470,600 lbf)
Specific impulse
299 s (2.93 km/s)
Burn time
172 seconds
Propellant
RP-1 / LOX
First stage
Powered by
1 RS-56-OSA
Maximum thrust
386 kN (87,000 lbf)
Specific impulse
316 s (3.10 km/s)
Burn time
283 seconds
Propellant
RP-1 / LOX
Second stage – Centaur
Powered by
2 RL-10A
Maximum thrust
147 kN (33,000 lbf)
Specific impulse
449 s (4.40 km/s)
Burn time
392 seconds
Propellant
LH2 / LOX
Third stage – Integrated Apogee Boost Stage (Only on DSCS III launches)
Powered by
2 R-4D
Maximum thrust
980 N (220 lbf)
Specific impulse
312 s (3.06 km/s)
Burn time
60 seconds
Propellant
N2O4 / MMH
[edit on Wikidata]
Atlas II was a member of the Atlas family of launch vehicles, which evolved from the successful Atlas missile program of the 1950s. The Atlas II was a direct evolution of the Atlas I, featuring longer first-stage tanks, higher-performing engines, and the option for strap-on solid rocket boosters. It was designed to launch payloads into low Earth orbit, geosynchronous transfer orbit or geosynchronous orbit. Sixty-three launches of the Atlas II, IIA and IIAS models were carried out between 1991 and 2004; all sixty-three launches were successes, making the Atlas II a highly reliable space launch system. The Atlas line was continued by the Atlas III, used between 2000 and 2005, and the Atlas V, which is still in use as of 2024[update].
^ abCite error: The named reference astronautixAtlasII was invoked but never defined (see the help page).
^ abTariq Malik "Final Atlas 2 Rocket Orbits Classified U.S. Satellite", Space News, August 31, 2004 (Accessed September 24, 2014)
^Wade, Mark. "Castor 4A engine". astronautix.com. Archived from the original on December 28, 2016.
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