— Specifications —

Basics

Country: United States
Operator: Orbital ATK
Max. cargo: 3,200 kg
Return payload: None
Reusable: No
Launch site: Mid-Atlantic Regional Spaceport, Virginia; Cape Canaveral Air Force Station, Florida
Launch vehicle: Antares 230; Atlas V 401
Design life: 66 days
Status: Active

Quick facts

First flight: Orb-D1, Sept. 18, 2013
Number flown: 7 as of Nov. 2016
Failures: 1 - Orb-3, Oct. 28, 2014
Stations serviced: The International Space Station
Names: Each Cygnus spacecraft is named after a fallen astronaut

Versions

Enhanced: 2015-Present
Standard: 2013-2014

The standard Cygnus.

The Standard Cygnus, now retired.

 
The third Cygnus launches atop an Antares 120 from Pad 0A at the Mid-Atlantic Regional Spaceport in Virginia. Photo Credit: NASA

The third Cygnus launches atop an Antares 120 from Pad 0A at the Mid-Atlantic Regional Spaceport in Virginia. Photo Credit: NASA


— Sections —

Pressurized Cargo Module

Width: 3.1 m
Max. Cargo: 3,200 kg
 Cargo volume: 27 m³


The Pressurized Cargo module was manufactured by Thales Alenia Space in Turin, Italy. The first four Cygnus spacecraft, the Standard version, had a smaller 18.9-cubic-meter module. The Enhanced version, which started flying in 2015, has a 27-cubic-meter module.

The PCM is similar in design to the Multi Purpose Logistics Modules that serviced the International Space Station, albeit smaller. It is attached to the station via a Common Berthing Mechanism at the top of the ship.

Once berthed to the space station, the crew enters the spacecraft from the CBM to unload the cargo. The Standard version held up to 2,000 kilograms of supplies, food and experiments. The Enhanced holds between 3,200 and 3,500 kilograms, depending on the launch vehicle used.

After the ship is emptied of cargo, it is loaded with trash and other unneeded equipment. Also sometimes located inside are experiments that need to be conducted remotely. An example of this are the SAFFIRE experiments, which study the spread of flames in microgravity. While the experiment is remotely conducted inside a specialized container, as an added safety precaution, it is performed after the spacecrafts ends its cargo mission and is at a safe distance from teh International Space Station.


 

Service Module

Mass: 1,800 kg
Width: 3 m
Width (w/ solar): 10.5 m


Built by Orbital ATK, the Service Module is based of the company's GEOStar and LEOStar spacecraft buss. It has a mass of 1,800 kilograms.

For propulsion, the SM uses the hypergolic propellants hydrazine and nitrogen tetroxide. The Standard version of Cygnus utilized two traditional solar panels while the Enhanced version sported Orbital ATK's new circular UltraFlex solar arrays.

The new solar arrays provide the same amount of power as the Standard version, 4 kilowatt hours, but with lower mass.

At the bottom of the SM is a grapple fixture that allows for the International Space Station's robotic Canadarm2 to attach to during rendezvous and capture operations. Once the arm has a firm grip, it moves Cygnus to one of two Earth-facing ports beneath the space station: either the Harmony module or Unity module.

The more recent SMs have had special External Cygnus CubeSat Deployer in order to "launch" up a multitude of CubeSats after the completion of the spacecrafts mission at ISS.