AJ-60A is a solid rocket booster produced by Aerojet Rocketdyne. Up to 2020 they were used as strap-on boosters on all United Launch Alliance Atlas V rocket configurations. They continue to be used on the Atlas V N22 configuration used to launch the Boeing Starliner.[1]
History
The AJ-60A rocket motor was developed between 1999 and 2003 for use on the Atlas V.[2]
On January 19, 2006 the New Horizons spacecraft to Pluto was launched directly into a solar-escape trajectory at 16.26 km/s from Cape Canaveral using an Atlas V version with 5 of these SRBs and Star 48B third stage.[3] New Horizons passed the Moon's orbit in just nine hours.[4]