Cygnus CRS Orb-4

Cygnus CRS Orb-4

Cygnus CRS Orb-4 / OA-4
Mission type ISS resupply
Operator NASA
Spacecraft properties
Spacecraft type Enhanced Cygnus[1]
Manufacturer Orbital ATK
Thales Alenia Space
Start of mission
Launch date 3 December 2015, 22:48 (2015-12-03T22:48) UTC[2]
Rocket Atlas V 401
Launch site Cape Canaveral SLC-41
Contractor United Launch Alliance
Orbital parameters
Reference system Geocentric
Regime Low Earth
Inclination 51.6 degrees
Epoch Planned
Berthing at ISS
Berthing port Unity nadir
← Cygnus CRS Orb-3 Cygnus CRS Orb-6

Cygnus CRS Orb-4, also known as Orbital Sciences CRS Flight 4 or CRS OA-4, is the fifth planned flight of the Orbital ATK uncrewed resupply spacecraft Cygnus and its fifth flight to the International Space Station under the Commercial Resupply Services contract with NASA.[3][4] With the Antares rocket undergoing a redesign following its failure during the CRS-3 launch, CRS-4 will be launched by an Atlas V rocket.


This is the fourth of eight flights by Orbital ATK under the Commercial Resupply Services contract with NASA. This will be the inaugural flight of the larger Enhanced Cygnus PCM. As of January 26, 2015, a United Launch Alliance Atlas 5 rocket will launch the fifth Orbital Sciences Cygnus cargo freighter on its fourth operational cargo delivery flight to the International Space Station from Cape Canaveral Air Force Station Space Launch Complex 41 on December 3, 2015. The mission is known as Orb-4 or OA-4, was originally scheduled for April 1, 2015.[5] The Atlas 5 rocket will fly in the 401 vehicle configuration with a four-meter fairing, no solid rocket boosters and a single-engine Centaur upper stage.[3]


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  5. ^ Orbital’s Antares fails seconds after launch