.jpg) An Atlas V 401 launches the S.S.Deke Slayton II. | |
| Names | CRS OA-4 CRS Orb-4 (2008–2015) Orbital-4 (2008–2015) |
|---|---|
| Mission type | ISS resupply |
| Operator | Orbital ATK |
| COSPAR ID | 2015-072A |
| SATCATno. | 41101 |
| Mission duration | 75 days, 18 hours, 15 minutes |
| Spacecraft properties | |
| Spacecraft | S.S.Deke Slayton II |
| Spacecraft type | Enhanced Cygnus[1] |
| Manufacturer |
|
| Launch mass | 7,492 kg (16,517 lb)[2] |
| Payload mass | 3,513 kg (7,745 lb) |
| Start of mission | |
| Launch date | 6 December 2015, 21:44:57 (2015-12-06UTC21:44:57Z) UTC (4:44:57 pm EST) |
| Rocket | Atlas V 401 (AV-061) |
| Launch site | Cape Canaveral,SLC‑41 |
| Contractor | United Launch Alliance |
| End of mission | |
| Disposal | Deorbited |
| Decay date | 20 February 2016, 16:00 (2016-02-20UTC17Z) UTC[3] |
| Orbital parameters | |
| Reference system | Geocentric orbit[4] |
| Regime | Low Earth orbit |
| Inclination | 51.64° |
| Berthing atISS | |
| Berthing port | Unitynadir |
| RMS capture | 9 December 2015, 11:19 UTC[5] |
| Berthing date | 9 December 2015, 14:26 UTC |
| Unberthing date | 19 February 2016, 10:38 UTC[6] |
| RMS release | 19 February 2016, 12:26 UTC |
| Time berthed | 71 days, 20 hours, 12 minutes |
 NASA insignia OA-6 → | |
OA-4, previously known asOrbital-4, was the fourth successful flight of theOrbital ATKuncrewed resupply spacecraftCygnus and its third flight to theInternational Space Station (ISS) under theCommercial Resupply Services (CRS-1) contract withNASA.[7][8] With theAntares launch vehicle undergoing a redesign following its failure during theOrb-3 launch, OA-4 was launched by anAtlas V launch vehicle. Following three launch delays due to inclement weather beginning on 3 December 2015, OA-4 was launched at 21:44:57UTC on 6 December 2015. With a liftoff weight of 7,492 kg (16,517 lb), OA-4 became the heaviest payload ever launched on an Atlas V.[9] The spacecraft rendezvoused with and was berthed to the ISS on 9 December 2015.[5] It was released on 19 February 2016 after 72 days at the International Space Station. Deorbit occurred on 20 February 2016 at approximately 16:00 UTC.[3]
OA-4 was the fourth of eight flights byOrbital ATK under theCommercial Resupply Services (CRS-1) contract withNASA and the inaugural flight of the larger Enhanced Cygnus PCM. The mission was originally scheduled for 1 April 2015.[10] TheAtlas Vlaunch vehicle launched in the 401 vehicle configuration with a four-meter fairing, no solid rocket boosters and a single-engine Centaur upper stage.[7]
In an Orbital ATK tradition, this Cygnus spacecraft was namedDeke Slayton II afterDeke Slayton, one of NASA's originalMercury Sevenastronauts and Director of Flight Operations, who died in 1993. This spacecraft reuses the nameDeke Slayton, originally applied to the Orb-3 spacecraft which was lost in an Antares rocket explosion in October 2014.[11]
The mission was the first flight of the enhanced variant of Orbital ATK's Cygnus spacecraft, capable of delivering more than 3,500 kg (7,700 lb) of essential crew supplies, equipment and scientific experiments to theInternational Space Station (ISS).
Total cargo: 3,349 kilograms (7,383 lb)[5][12]
Total cargo with packing material: 3,513 kg (7,745 lb)
This article incorporates text from this source, which is in thepublic domain. This article incorporates text from this source, which is in thepublic domain.
Media related toCygnus 5 at Wikimedia Commons
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