Cygnus CRS OA-4
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The CRS OA-4 Cygnus spacecraft approaches the ISS
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| Mission type | ISS resupply |
|---|---|
| Operator | Orbital ATK |
| COSPAR ID | 2015-072A |
| SATCAT no. | 41101 |
| Mission duration | Final: 76 days |
| Spacecraft properties | |
| Spacecraft | Cygnus 5 |
| Spacecraft type | Enhanced Cygnus |
| Manufacturer |
Orbital ATK Thales Alenia Space |
| Launch mass | 7,492 kg (16,517 lb) |
| Payload mass | 3,513 kg (7,745 lb) |
| Start of mission | |
| Launch date | 6 December 2015, 21:44:57 UTC |
| Rocket | Atlas V 401 |
| Launch site | Cape Canaveral SLC-41 |
| Contractor | United Launch Alliance |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 20 February 2016, 16:00 UTC |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Semi-major axis | 6,781.5 km (4,213.8 mi) |
| Eccentricity | 0.0008 |
| Perigee | 397.9 km (247.2 mi) |
| Apogee | 408.8 km (254.0 mi) |
| Inclination | 51.64 degrees |
| Epoch | 9 December 2015, 05:44:31 UTC |
| Berthing at International Space Station | |
| Berthing port | Unity nadir |
| RMS capture | 9 December 2015, 11:19 UTC |
| Berthing date | 9 December 2015, 14:26 UTC |
| Unberthing date | 19 February 2016, 10:38 UTC |
| RMS release | 19 February 2016, 12:26 UTC |
| Time berthed | 71 days, 20 hours, 12 minutes |
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NASA OA-4 mission patch
Cygnus CRS OA-4, also known as Orbital Sciences CRS Flight 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 (16,517 lb), 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.
OA-4 was the fourth of eight flights by Orbital ATK under the Commercial Resupply Services contract with NASA and the inaugural flight of the larger Enhanced Cygnus PCM. The mission was originally scheduled for 1 April 2015. The Atlas 5 rocket launched in the 401 vehicle configuration with a four-meter fairing, no solid rocket boosters and a single-engine Centaur upper stage.
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