Canadarm2 grapples the S.S. Roger Chaffee, while Dragon C108 is docked to Harmony.
NamesOA-11 (2016–2018)
Mission typeISS logistics
OperatorNorthrop Grumman
COSPAR ID2019-022A Edit this at Wikidata
SATCAT no.44188
Mission duration232 days, 18 hours, 42 minutes
Spacecraft properties
SpacecraftS.S. Roger Chaffee
Spacecraft typeEnhanced Cygnus
Start of mission
Launch date17 April 2019, 20:46:07 UTC[1]
RocketAntares 230
Launch siteWallops Pad 0A
ContractorNorthrop Grumman
End of mission
Decay date6 December 2019, 15:28 UTC
Orbital parameters
Reference systemGeocentric orbit
RegimeLow Earth orbit
Berthing at the International Space Station
Berthing portUnity nadir
RMS capture19 April 2019, 09:28 UTC[1]
Berthing date19 April 2019, 11:31 UTC
Unberthing date6 August 2019, 13:30 UTC[2]
RMS release6 August 2019, 16:15 UTC[3]
Time berthed109 days, 1 hour, 59 minutes
Mass3,436 kg (7,575 lb)[4]
Pressurised3,162 kg (6,971 lb)
Unpressurised239 kg (527 lb)

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NG-11, previously known as OA-11, is the twelfth flight of the Northrop Grumman robotic resupply spacecraft Cygnus and its eleventh flight to the International Space Station under the Commercial Resupply Services (CRS-1) contract with NASA.[5][6] The mission launched on 17 April 2019 at 20:46:07 UTC.[1] This is the last mission from the extended CRS-1 (phase 1) contract; follow-up missions are part of the CRS-2 contract.[7] Cygnus NG-11 was also the first mission to load critical hardware onto Cygnus within the last 24 hours prior to launch, a new Antares feature.[8]

Orbital ATK and NASA jointly developed a new space transportation system to provide commercial cargo resupply services to the International Space Station (ISS). Under the Commercial Orbital Transportation System (COTS) program, then Orbital Sciences designed and built Antares, a medium-class launch vehicle; Cygnus, an advanced maneuvering spacecraft, and a Pressurized Cargo Module which is provided by Orbital's industrial partner Thales Alenia Space.[9] Northrop Grumman purchased Orbital in June 2018; its ATK division was renamed Northrop Grumman Innovation Systems.[10]

Concurrently, Nepalese satellite NepaliSat-1 and Sri Lankan satellite Raavana 1 were launched as part of Cygnus NG-11 as deployable payloads.[11]

Northrop Grumman launches the Cygnus NG-11 mission.


Cygnus NG-11 is part of an extension program that enables NASA to cover the ISS resupply needs until the Commercial Resupply Services 2 contract enters in effect.[12] The mission launched on 17 April 2019, at 20:46:07 UTC from Wallops Island, Virginia.


Main article: Cygnus (spacecraft)

Production and integration of Cygnus spacecraft is performed in Dulles, Virginia. The Cygnus service module is mated with the pressurized cargo module at the launch site, and mission operations are conducted from control centers in Dulles, Virginia and Houston, Texas.[9] This will be the eighth flight of the Enhanced-sized Cygnus PCM.[13]

The spacecraft for the NG-11 is named the S.S. Roger Chaffee after Roger Chaffee who lost his life during training for the Apollo 1 mission.[14] On 17 April 2019 at 20:46:07 UTC, Antares launched the NG-11 mission to the International Space Station from Wallops Island, Virginia.[1][15]


Total weight of cargo: 3,436 kg (7,575 lb), consisting of 3,162 kg (6,971 lb) in pressurized cargo and 229 kg (505 lb) in unpressurized cargo.[4]

Smallsats deployed during NG-11:

New hardware, known as the Thermal Amine Scrubber, the first Exploration ECLSS Tech Demonstration aboard ISS, which will be activated in April 2019 and scrub additional CO2 from the ISS atmosphere.

See also


  1. ^ a b c d Richardson, Derek (19 April 2019). "NG-11 Cygnus Begins 3-month ISS Stay". Spaceflight Insider. Retrieved 4 November 2019.
  2. ^ Todd, David (12 August 2019). "Cygnus NG-11 departs ISS dropping off satellites as it goes". Seradata. Retrieved 4 November 2019.
  3. ^ Clark, Stephen (6 August 2019). "Cygnus supply ship departs space station, begins extended mission". Spaceflight Now. Retrieved 4 November 2019.
  4. ^ a b "Northrop Grumman CRS-11 Mission Overview" (PDF). NASA. Archived from the original (PDF) on 21 April 2019. Retrieved 15 June 2019. Public Domain This article incorporates text from this source, which is in the public domain.
  5. ^ "Launch Schedule". Spaceflight Now. Retrieved 12 February 2015.
  6. ^ "International Space Station Flight Schedule". Students for the Exploration and Development of Space. 15 May 2013.
  7. ^ Gebhardt, Chris (1 June 2018). "Orbital ATK looks ahead to CRS2 Cygnus flights, Antares on the commercial market". Retrieved 2 June 2018.
  8. ^ Foust, Jeff (16 April 2019). "Latest Cygnus mission to ISS includes new features". SpaceNews. Retrieved 23 September 2019.
  9. ^ a b "Cygnus Fact Sheet" (PDF). Orbital ATK. 24 March 2015. Archived from the original (PDF) on 26 September 2015. Retrieved 14 August 2015.
  10. ^ Erwin, Sandra (5 June 2018). "Acquisition of Orbital ATK approved, company renamed Northrop Grumman Innovation Systems". SpaceNews. Retrieved 23 July 2018.
  11. ^ Paudel, Nayak (18 April 2019). "Nepal's first ever satellite launched into space". The Kathmandu Post. Retrieved 18 April 2019.
  12. ^ Leone, Dan (20 August 2015). "NASA Considering More Cargo Orders from Orbital ATK, SpaceX". SpaceNews. Retrieved 17 April 2019.
  13. ^ Leone, Dan (17 August 2015). "NASA Orders Two More ISS Cargo Missions From Orbital ATK". SpaceNews. Retrieved 17 August 2015.
  14. ^ "S.S. Roger Chaffee" (PDF). Northrop Grumman. Archived from the original (PDF) on 17 April 2019. Retrieved 17 April 2019.
  15. ^ Martz, Michael (17 April 2019). "Rocket launches from Wallops Island with student-inspired satellites from Richmond-area schools". Richmond Times-Dispatch. Retrieved 19 April 2019.
  16. ^ Krebs, Gunter. "AeroCube 10A and 10B". Gunter's Space Page.
  17. ^ a b c d e f g h Clark, Stephen (19 April 2019). "Cygnus supply ship delivers 3.8-ton cargo load to International Space Station". Spaceflight Now. Retrieved 5 November 2019.
  18. ^ "Upcoming ElaNa CubeSat Launches". NASA. 3 July 2016. Archived from the original on 13 March 2019. Retrieved 12 March 2019. Public Domain This article incorporates text from this source, which is in the public domain.
  19. ^ "KRAKsat". Retrieved 5 November 2019.
  20. ^ a b Clark, Stephen (18 April 2019). "Antares rocket boosts Cygnus supply ship toward International Space Station". Spaceflight Now. Retrieved 5 November 2019.
  21. ^ Krebs, Gunter. "ThinSat 1A, ..., 1L". Gunter's Space Page.