Northrop Grumman's Cygnus NG-12 cargo spacecraft departed the International Space Station (opens in new tab) today (Jan. 31), nearly three months after it arrived at the orbiting laboratory with about 4 tons of supplies and science experiments for the Expedition 61 crew.
The cargo vessel, named the S.S. Alan Bean (opens in new tab) after the Apollo 12 astronaut, began its journey back to Earth after ground controllers in Houston used the station's Canadarm2 robotic arm to release it in orbit. Before the spacecraft meets its fiery demise in Earth's atmosphere, it will spend about a month in orbit deploying various scientific payloads.
On Feb. 29, ground controllers will initiate a deorbit maneuver, after which the cargo ship will execute "a safe, destructive reentry into Earth’s atmosphere," NASA officials said in a statement (opens in new tab).
Video: See stunning Earth views as Cygnus spacecraft departs space station (opens in new tab)
Related: Antares rocket launches Cygnus NG-12 cargo craft (photos) (opens in new tab)
"I’d just like to say farewell to the S.S. Alan bean and thank you to the entire Cygnus NG-12 team for making Expedition 61 highly successful," NASA astronaut and Expedition 61 flight engineer Andrew Morgan said during a live webcast of the spacecraft's departure. He and his fellow Expedition 61 crewmember Jessica Meir provided backup support as ground controllers maneuvered the Cygnus away from the space station.
While this isn't the first Cygnus cargo vessel to embark on a secondary mission after leaving the space station — the NG-11 mission also took an extended detour (opens in new tab) on its way out in August — it was the first to test out a new release procedure. Typically astronauts on board the station manually operate the robotic arm to release these cargo vessels, but this time NASA tried a different method for the S.S. Alan Bean's departure.
"For this mission, Cygnus demonstrated a new release position for departure operations and incorporated the first ground-controlled release," NASA officials wrote in the ISS blog (opens in new tab). "The new orientation allowed for easier drift away from the station’s Canadarm2 robotic arm."
During its remaining time in orbit, the S.S. Alan Bean "does have a secondary mission of deploying a number of small satellites to test different technologies — things like cameras, antennas, different communications technologies, solar cells, a number of different materials in the low Earth orbit environment," NASA spokesman Dan Huot said during the webcast.
Some cubesats (opens in new tab) will deploy later this evening, with another batch deploying on Saturday (Feb. 1). Those cubesats include the University of Washington's HuskySat-1 (opens in new tab), the University of Florida's SwampSat II, Sonoma State University's EdgeCube (opens in new tab) and Utah State University's Compact Infrared Radiometer in Space (CIRiS (opens in new tab)) experiment.
Once the Cygnus capsule completes its secondary mission, it will burn up in the atmosphere along with 5,800 lbs. (2,600 kilograms) of disposable cargo, or trash, that the crew of Expedition 61 packed inside.
The next Cygnus mission, NG-13 (also known as the S.S. Robert H. Lawrence (opens in new tab)) is scheduled to launch to the space station on Feb. 9.
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- Private Antares rocket & Cygnus spacecraft explained (infographic)
Email Hanneke Weitering at firstname.lastname@example.org (opens in new tab) or follow her @hannekescience (opens in new tab). Follow us on Twitter @Spacedotcom (opens in new tab) and on Facebook (opens in new tab).(opens in new tab)