Antares A-ONE mission was the maiden flight of Orbital Sciences Corporation' Antares launch vehicle including the ascent to space and accurate delivery of a simulated payload, the Cygnus Mass Simulator (CMS), which was launched 21 April 2013.

[6] It was launched from Pad 0A at the Mid-Atlantic Regional Spaceport (MARS), Wallops Flight Facility, Virginia.

This launch along with several other activities leading up to it, are paid milestones under NASA's Commercial Orbital Transportation Services (COTS) program.

[8] It was equipped with 22 accelerometers, 2 microphones, 12 digital thermometers, 24 thermocouples and 12 strain gages.

[8] Four Spaceflight Industries Inc. CubeSat nanosatellites were deployed from the dummy payload.