The Athena-3 is a rocket planned by ATK as a medium launch vehicle.
The vehicle is based on a Castor-900 three-segment SRB booster, which is derived from the Space Shuttle four-segment SRB. This first stage is topped by a Castor-120 and a Castor-30 solid rocket motors.
In March 2017, Lockheed Martin announced, that they are ending the active marketing of the Athena family of rockets.
|Version||Stage 1||Stage 2||Stage 3||Stage 4|
|Athena-3||Castor-900 (SRB-3)||Castor-120||Orbus-21D||OAM / 4 × MR-107|
No: TNo: Type: Date LS Payload
none Planned: Launch sites: CC = Spaceport Florida, Cape Canaveral, Florida, USA Kd = Pacific Spaceport Complex - Alaska (Kodiak Launch Complex), Kodiak Island, Narrow Cape, Alaska, USA / LP-3