Minimize Cygnus NG-15

Cygnus NG CRS-15 resupply flight to the ISS

Launch    Some payloads    References

For the NG CRS-15 mission, the Cygnus spacecraft will deliver approximately 3,800 kg of cargo to the space station. Cygnus is comprised of two primary components, the Pressurized Cargo Module and the Service Module. In keeping with company tradition, each spacecraft is named after an important figure in the aerospace industry. 1)

Northrop Grumman is honored to name the NG-15 Cygnus spacecraft after Katherine Johnson, a NASA mathematician and Black woman who broke through barriers of gender and race, and whose work was critical in sending the first Americans into space. Katherine Johnson was born on August 26, 1918 and died on February 24, 2020 at the age of 101. During her 35 year career at NASA, she calculated the orbital mechanics and trajectories of various US missions to space, such as Alan Shepard’s first mission to space and John Glenn’s first flight to orbit. Furthermore, she worked on the rendezvous of the Apollo lunar module and command module and her calculations were essential for the Space Shuttle program. Kathrine Johnson’s work was honored by a variety of awards and medals. In 2015, Johnson received the highest civilian award in the United States, the Presidential Medal of Freedom. In 2016, she received NASA’s Silver Snoopy award, followed by the Congressional Gold Medal in 2019. With her work, she inspired generations of African American women and paved the way for desegregation in the 1950s and 1960s.


Figure 1: Katherine Johnson photographed at her desk at Langley Research Center in 1966 (photo credit: NASA)

The S.S. Katherine Johnson will be launched into orbit using an Antares 230+ rocket from Virginia Space’s Mid-Atlantic Regional Spaceport (MARS) Pad 0A on Wallops Island, Virginia. Northrop Grumman will once again load critical cargo into Cygnus 24 hours before the scheduled launch.


Figure 2: General parameters of the Cygnus spacecraft and of the Antares launch vehicle (image credit: Northrop Grumman)

Launch: NASA commercial cargo provider Northrop Grumman launched its Antares 230+ vehicle Cygnus CRS-15 on Feb. 20, 2021 (17:36 UTC, 12:36 p.m. EST) from MARS (Mid-Atlantic Regional Spaceport) on Wallops Island, VA, the 15th resupply mission to the International Space Station. 2) 3) 4)


Figure 3: A Northrop Grumman Antares rocket lifts off Saturday from the Eastern Shore of Virginia (image credit: NASA/Patrick Black)

Orbit: Near circular orbit, altitude of ~ 400 km, inclination = 51.6º, period of~92 minutes.

The Cygnus spacecraft, dubbed the SS Katherine Johnson, will arrive at the space station Monday, Feb. 22. About 4:40 a.m., Expedition 64 Japan Aerospace Exploration Agency astronaut Soichi Noguchi will capture Cygnus, with NASA astronaut Michael Hopkins acting as a backup. After Cygnus capture, mission control in Houston will send ground commands for the station’s arm (Canadarm 2) to rotate and install it on the station’s Unity module Earth-facing port.

The Cygnus spacecraft will remain at the space station until May before it disposes of several thousand pounds of trash through its destructive re-entry into Earth’s atmosphere.

Some payloads on flight Cygnus NG-15

Of note, the ISS National Lab is sponsoring a number of technology development payloads on Northrop Grumman CRS-15. By supporting technology development investigations on the orbiting laboratory, the ISS National Lab serves as a business incubator in space, enabling advancements not possible on Earth that help to drive a robust and sustainable market in low Earth orbit. Additionally, insights gained from such projects can be used to improve products and processes that will produce positive economic impact. Below are some of the investigations sponsored by the ISS National Lab that are launching on Northrop Grumman CRS-15. 5)

Highlights of space station research facilitated by this Cygnus mission are:

Spaceborne Computer-2, a high-performance commercial off-the-shelf computer system being studied to increase data processing speeds for science aboard the space station.

- In 2017, engineers from Hewlett Packard Enterprise launched a high-performance computer, called the Spaceborne Computer, to test whether a commercial off-the-shelf computer system without any hardware modifications could operate seamlessly in the extreme conditions of space. Based on this success, the team will now launch its second iteration of the Spaceborne Computer—this time delivering twice the computational power and providing in-space data processing capabilities. Using Spaceborne Computer-2, researchers may see improvements in the ability to process and analyze data onboard the ISS rather than sending the data back to Earth for analysis, enabling faster results and greater potential for in-space iteration of research.

- Spaceborne Computer-2 High Performance Commercial Off-The-Shelf (COTS) Computer System on the ISS (Spaceborne Computer-2) builds upon the successes of Spaceborne Computer, exploring how commercial off-the-shelf computer systems can advance exploration by processing data significantly faster in space with edge computing and artificial intelligence (AI) capabilities. Spaceborne Computer-2 further tests additional techniques for recovering or mitigating errors in the extreme environment of unprotected solar radiation, galactic cosmic radiation (GCR) and other events. Additionally, Hewlett Packard Enterprise (HPE) works with the space community and the International Space Station-National Laboratory (ISS-NL) to test and demonstrate that current Earth-based data processing of ISS experimental data can be performed onboard during the anticipated 24 to 36 month mission of Spaceborne Computer-2.


Figure 4: The Spaceborne Computer-2 pictured prior to launch (image credit: NASA)

• Crystals grown in microgravity are often larger and more well-ordered than Earth-grown crystals—and over the years, crystal growth has been an important area of research on the ISS. On this mission, Redwire will launch its Industrial Crystallization Facility(ICF), the sixth commercial facility the company has developed for testing and use on the ISS. The ICF will provide a space-based platform for the growth and formulation of centimeter-scale single crystals and other exotic materials for use in the optics and sensor industries. Validation of the ICF will also provide a proof of concept for applied industrial materials production in microgravity, which will be an important in-orbit research and development capability in the future.

• Three separate investigations launching on this mission will utilize the MISSE Flight Facility—a platform operated by Alpha Space on the exterior of the ISS that exposes samples to the harsh space environment, which includes extreme temperature variations, enhanced radiation levels, and atomic oxygen. These investigations include an agricultural investigation evaluating the effects of the space environment on barley seeds, an academic study examining how phosphor powders and composites react in space, and a private-sector experiment testing the durability of 3D printed radio frequency circuits in space for potential use in future small satellites.

• LambdaVision’s, second experiment headed to the space station to study the advantages of manufacturing artificial retinas in space
Micro-16, an investigation studying muscle strength changes in worms to help us better understand muscle weakening that astronauts can experience in microgravity

Micro-16, an investigation studying muscle strength changes in worms to help us better understand muscle weakening that astronauts can experience in microgravity.

- To figure out if decreased expression of muscle proteins is associated with muscle weakening, researchers study C. elegans worms moving around a microscope slide filled with rubber pillars. Researchers can then determine the strength of the worms by how much force they apply to the pillars while moving around. The results could also support new therapies targeting age-related muscle loss on Earth.

• The Real-Time Protein Crystal Growth-2 experiment, which will demonstrate new methods for producing high-quality protein crystals in microgravity. The structure of protein crystals is often closely related to their function in the human body. Therefore, growing protein crystals and studying their structures often leads to understanding the function and effects of it. While on Earth, protein crystal growth is often difficult to achieve, due to Earth’s gravity interfering, whereas the microgravity environment on the ISS negates gravity from the equations. Researchers hope to get a better understanding of growing protein crystals to identify possible targets for future drugs to fight certain diseases.

A-HoSS (Artemis HERA on Station), a radiation detection system developed for the Orion spacecraft and certified for use on NASA’s Artemis II mission, the first mission on which a crew of astronauts will orbit the Moon in the spacecraft. The HERA (Hybrid Electronic Radiation Assessor) was modified for the use on the ISS and will have to operate for at least 30 days without any errors to validate the system for crewed flight in upcoming Artemis missions. It will first be put to use on the Artemis II mission that will orbit the Moon.

Exploration ECLSS: Brine Processor System, a demonstration in regenerative life support technology that will help provide more clean air and water to the space station crew. The objective is to demonstrate recovery of additional water from the Urine Processor Assembly in order to further increase the current percentage of recoverable water on the ISS. In order to achieve the 98% of water recovery that is needed for long-duration crewed exploration missions, the brine processor’s dual membrane bladder allows water vapor to pass through while filtering out contaminants.

- The ECLSS (Environmental Control and Life Support System) was developed by Paragon Space Development Corporation (Paragon) with HQs in Tuscon, Arizona. Paragon's brine processing technology - which is vital to generating water for the crew of a spacecraft, space station or potential transport to or habitation on the Moon or Mars - represents a ground-breaking innovation that will be critical to long-duration human spaceflight missions. 6)

- While essentially used to recover water from urine, Paragon's Brine Processing System is notable in that it will increase the level of recoverable water in the current systems on the ISS by using a dual membrane that allows water vapor to pass through while filtering out contaminants.

- "This technology is essential to long-term spaceflight operations and even future stays on other planetary bodies - and if we're serious about going to Mars, demonstrating the feasibility and success of this system is critical. Understanding the need to squeeze every bit of recovery and efficiency from systems with energy and space constraints - like any spacecraft - is crucial in deep space exploration!" said Grant Anderson, Paragon's President and CEO.

- "Paragon is in the business of technological innovation, engineering solutions and scientific advancement - and our Brine Processing System exemplifies our business. This is a game-changer and we look forward to supporting NASA on the next challenge!"

- The water recovery rate of systems currently used on orbit is between 75-90% - but long-duration missions require a level of approximately 98%. And while there is currently no state-of-the-art technology in brine processing that can meet this requirement, Paragon's system is expected to achieve this target.

- Paragon's system will undergo a one-year demonstration period to prove viability and success.

• With the Protein-Based Artificial Retina Manufacturing experiment, LambdaVision aims to evaluate an artificial retina manufacturing system on their second flight to the ISS. This manufacturing system uses a light activated protein to replace the function of damaged cells in the eye. LambdaVision hopes to “gather more critical information on the overall design of the system and influence of microgravity on the layering process, as well as the necessary controls required to support good manufacturing processes.” – Nicole Wagner, Ph.D., president and CEO of LambdaVision.

• Dreams: Astronauts often report sleeping better while being on the International Space Station than while being on Earth. ESA’s (European Space Agency) Dreams experiment will add one step to the astronauts’ night routine, a Dry-EEG headband. This EEG will serve as a technology demonstration, as well as a way to monitor the sleep quality during long-duration missions. Researchers can then analyze the results with direct feedback from the astronauts. Overall, a better understanding of sleep in microgravity adds to the better understanding of human health in microgravity.


Figure 5: The space station soared more than 250 miles (400 km) over the Wallops launch base minutes before liftoff of the Antares rocket, and Noguchi tweeted a spectacular photo of Virginia’s Eastern Shore, showing the region covered by scattered clouds, and a blanket of snow to the west (image credit: NASA)

ELaNa 33 (Educational Launch of Nanosatellites-33) will deploy the following CubeSats from the ISS

• IT-SPINS (SpaceBuoy), operated by Montana State University at Bozeman, Montana, externally deployed by Cygnus spacecraft.

• Slingshot and Nanoracks deployer: a number of CubeSats will be released via Slingshot and Nanoracks deployers, including Dhabisat, the second CubeSat developed by Khalifa University in Abu Dhabi, United Arab Emirates. Dhabisat was developed as part of Khalifa's Space Systems and Technology Concentration, a joint program established in 2015 with UAE-based satellite operator Al Yah Satellite Communications Company (Yahsat) and Northrop Grumman.

• Launching aboard Antares with Cygnus will be 42 ThinSats as part of a STEM outreach program for grades 4-12 by the Virginia Commercial Space Flight Authority. 7)

- The Antares launched ThinSats into very low Earth orbit Feb. 20 to gather data for one to five days before reentering Earth’s atmosphere.

- “We received Globalstar data in the first 11 minutes after deployment over the remote region of South Atlantic Ocean,” Matt Voss, NearSpace Launch chief operations officer, told SpaceNews. “NearSpace Launch and Virgina Space are still doing analysis of mission results and diagnostic of the STEM mission.”

- The very low Earth orbit where ThinSats were deployed is important for climate research and space weather forecasts but difficult to study because of the high levels of atmospheric drag satellites experience, Hank Voss, NearSpace Launch co-founder and ThinSat inventor, said in a statement.

• On board the Cygnus will be three spacecraft belonging to Spaceflight customers, including Gunsmoke-J of LANL (Los Alamos National Laboratory)and two undisclosed U.S. government payloads. The Gunsmoke-J is a Joint Capability Technology Demonstration executed by the U.S. Army Space and Missile Defense Command, sponsored by both the Office of the Under Secretary of Defense (Research and Engineering) and the U.S. Army. This science and technology effort will demonstrate an entry-level capability in a 3U form factor relevant to Army warfighter needs and will also help inform future acquisition decisions.

• TSURU, a technology demonstration CubeSat of Kyushu Institute of Technology, Japan.

• MAYA 2, a technology demonstration CubeSat of Kyushu Institute of Technology, Japan.

• GuaraniSat-1, a technology demonstration CubeSat of Kyushu Institute of Technology and the Paraguayan Space Agency.

• TAU-Sat1 (Tel Aviv University Satellite1), a 3U CubeSat of Tel Aviv University, Israel with a mass of ~2.5 kg. TAU-Sat1 Israel launches research nanosatellite to measure radiation in space. 8)

- TAU completed the construction of “TAU-SAT1” about four months ago and sent it for pre-flight testing at the Japanese space agency JAXA. About two weeks ago, the nanosatellite arrived at its final stop prior to liftoff: Wallops Island in Virginia, where it “caught a ride” on a NASA resupply spacecraft destined for the International Space Station.

- The data it collects will help scientists design protective equipment for astronauts and space systems, which can be easily damaged by cosmic radiation. According to Meir Ariel, director of TAU’s Center for Nanosatellites, “Our scientific task is to monitor this radiation, and to measure the flux of these particles and their products.”

February 22, 2021: Nanoracks Launches Two CubeSats on Cygnus NG-15 9)

This launch is Nanoracks’ ninth mission providing opportunities for CubeSat deployment from the Cygnus. The CubeSats onboard today’s launch, IT-SPINS and MySat-2 (DhabiSat), were built by students and researchers at Montana State University and Khalifa University in Abu Dhabi.

The IT-SPINS CubeSat was selected for launch by NASA’s CubeSat Launch Initiative (CSLI) as part of the Educational Launch of Nanosatellites-33 (ELaNa-33) mission complement, sponsored by the NASA Launch Services Program (LSP).

MySat-2 (DhabiSat) is the second CubeSat built by Khalifa University to be launched by Nanoracks. MySat-1 was deployed from the NG-10 Cygnus spacecraft in February 2019. These small satellites enable students to design, implement and test software modules for attitude determination and control systems.

The two CubeSats are being carried in the E-NRCSD (External- Nanoracks Cygnus Deployer). Cygnus NG-15 will remain at the ISS for several weeks to complete its primary science and technology goals. After the Cygnus departs from the ISS, it boosts to a higher altitude, where the E-NRCSD dispenses the CubeSats into orbit.

Cygnus CRS NG-15 Resupply Ship at the ISS

• February 22, 2021: The Northrop Grumman Cygnus cargo spacecraft was berthed to the International Space Station’s Earth-facing port of the Unity module at 7:16 a.m. EST Monday morning and subsequently bolted into place. Cygnus will remain at the space station until May, when the spacecraft will depart the station. Following departure, the Cygnus will dispose of several tons of trash during a fiery reentry into Earth’s atmosphere. 10)


Figure 6: February 22, 2021: International Space Station Configuration. Five spaceships are attached to the space station including the SpaceX Crew Dragon, the Northrop Grumman Cygnus-15 cargo craft, and Russia’s Progress 76 and 77 resupply ships and Soyuz MS-17 crew ship (image credit: NASA)

• February 22,2021: At 4:38 a.m. EST, Expedition 64 Flight Engineer Soichi Noguchi of the Japanese Aerospace Exploration Agency used the International Space Station’s robotic Canadarm2 to grapple the Northrop Grumman Cygnus spacecraft as Flight Engineer Michael Hopkins of NASA monitored Cygnus systems during its approach. Next, ground controllers will command the station’s arm to rotate and install Cygnus, dubbed the S.S. Katherine Johnson, on the Earth-facing port of the station’s Unity module.


Figure 7: The Northrop Grumman Cygnus-15 resupply ship is pictured about 30 meters away from the space station approaching its capture point near the Canadarm2 robotic arm (image credit: NASA TV)

1) ”NG-15 Mission - Delivering Cargo to the International Space Station,” Northrop Grumman, 2 February, 2021, URL:

2) Monica Witt, Stephanie Schierholz, Leah Cheshier, Keith Koehler, ”NASA Science, Cargo Launches on 15th Northrop Grumman Resupply Mission to Space Station,” NASA Press Release 21-019, 20 February 2021, URL:

3) Stephen Clark, ”Antares rocket launches heavy cargo load to International Space Station,” Spaceflight Now, 20 February 2021, URL:

4) Stephanie Schierholz, Monica Witt, Keith Koehler, ”NASA TV Coverage Set for Next Cargo Launch to Space Station,” NASA Press Release, 12 February 2021, URL:

5) ”Several Technology Development Payloads Sponsored by the ISS National Lab Launching on Northrop Grumman CRS-15,” SpaceRef, 17 February 2021, URL:

6) ”Paragon delivers key life support system to ISS,” Space Daily, 25 February 2021, URL:

7) Debra Werner, ”Toast-shaped ThinSats attract educational and government customers,” SpaceNews, 22 February 2021, URL:

8) ”Tel Aviv University nanosatellite reaches orbit,” Tel Aviv University, 22 February 2021, URL:

9) ”Nanoracks Launches Two CubeSats on NG-15 Cygnus,” Nanoracks, 22 February 2021, URL:

10) Mark Garcia, ”Cygnus Resupply Ship Bolted to Station’s Unity Module,” NASA Space Station, 22 February 2021, URL:

The information compiled and edited in this article was provided by Herbert J. Kramer from his documentation of: ”Observation of the Earth and Its Environment: Survey of Missions and Sensors” (Springer Verlag) as well as many other sources after the publication of the 4th edition in 2002. - Comments and corrections to this article are always welcome for further updates (

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