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The spacecraft, named Cygnus, would be built around a service module based on Orbital's Star Bus, a satellite bus in use since 1997, which would be attached to a pressurized cargo module built by Thales Alenia Space, which had also built the MPLM cargo module used by the Space Shuttle, the cargo module for the European ATV spacecraft and ...
Cygnus was developed by Orbital Sciences Corporation, partially funded by NASA under the agency's Commercial Orbital Transportation Services program. To create Cygnus, Orbital paired the Multi-Purpose Logistics Module, built by Thales Alenia Space and previously used by the Space Shuttle for ISS logistics, with a service module based on Orbital's GEOStar, a satellite bus.
Cygnus NG-18 was the seventh Cygnus mission under the Commercial Resupply Services-2 contract. Northrop Grumman Innovation Systems confirmed on 23 February 2021 that Thales Alenia Space of Turin, Italy, will fabricate two additional Pressurized Cargo Modules (PCMs) for a pair of forthcoming Commercial Resupply Services-2 missions.
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 the International Space Station (ISS). Total cargo: 3,349 kilograms (7,383 lb) [5] [12] Crew supplies: 1,181 kg (2,604 lb)
The spacecraft was an Enhanced Cygnus, named the S.S. Patricia "Patty" Hilliard Robertson in honor of the NASA astronaut who died in a plane crash prior to being assigned to a crew to fly to the ISS. NG-20 was the first launch of a Cygnus spacecraft after Northrop Grumman exhausted the supply of its Antares 230+ rocket.
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The Cygnus spacecraft inside the Space Station Processing Facility. This is the seventh of ten flights by Orbital ATK under the Commercial Resupply Services contract with NASA. This is the fourth flight of the Enhanced-sized Cygnus PCM. [12] [18] The spacecraft and on-board payloads were processed at Kennedy's Space Station Processing Facility.
Late cargo loading concluded on 19 February 2021. The Cygnus NG-15 spacecraft launched the next day at 17:36:50 UTC on an Antares launch vehicle from the Mid-Atlantic Regional Spaceport (MARS) at NASA's Wallops Flight Facility, Wallops Island, Virginia. Cygnus NG-15 is the fourth Cygnus mission under the Commercial Resupply Services-2 contract.