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Cygnus CRS OA-4

Cygnus CRS OA-4

Capability: Cargo Earth Orbit Logistics
Maiden Flight: 2015-12-06
Flight Life: 1 Week to 2 Years design life.

Payload Capacity: 3200

Cygnus CRS OA-4, also known as Orbital ATK CRS-4 and CRS Orb-4, was the fourth successful flight of the Orbital ATK uncrewed resupply spacecraft Cygnus and its third flight to the International Space Station under the Commercial Resupply Services contract with NASA. With the Antares rocket undergoing a redesign following its failure during the Orb-3 launch, OA-4 was launched by an Atlas V rocket. Following three launch delays due to inclement weather beginning on 3 December 2015, OA-4 was launched at 21:44 UTC on 6 December 2015. With a liftoff weight of 7,492 kilograms, OA-4 became the heaviest payload ever launched on an Atlas V. The spacecraft rendezvoused with and was berthed to the ISS on 9 December 2015. It was released on 19 February 2016 after 72 days at the station. Deorbit occurred on 20 February at approximately 16:00 UTC.

History

Cygnus is a spacecraft developed originally by Orbital ATK and then aquired by Northrup Grumman after an aquisition. It is used to transport cargo to the ISS.

The first operational mission of Cygnus to the ISS was in September 2013.

One flight on 28 October 2014 ended in a failure when the Antares launch vehicle, used to launch the Cygnus, exploded shortly after launch. This set back the Cygnus launch schedule over a year. Following the launch anomaly a new version known as ‘Cygnus Enhanced’ was flown. This extended the Cygnus length and allowed it to carry an extra 700kg to the ISS.

The Cygnus spacecraft is launched aboard Antares or the Atlas V to deliver cargo to the ISS under NASAs CRS contracts. It has no heatshield so at the end of its mission its used to dispose of waste by burning up in the Earths atmosphere.

Agency

Northrop Grumman Innovation Systems
Type: Commercial

Northrup Grumman Innovation Systems designs, builds and delivers space, defence and aviation-related systems to customers around the world. They aquired Orbital ATK in 2018 along with its launchers and ongoing missions. Antares launches from Wallops in Virginia. Minotaur has many launch sites, with the most active now being Cape Canaveral and Vandenberg. Pegasus is an air launched vehicle from an aircraft and so has many launch locations.

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