Space Launch System to Boost Science with Secondary Payloads

When NASA's new Space Launch System (SLS) launches on its first flight, it will be doing some serious multi-tasking. Not only will Exploration Mission-1 test the performance of SLS and its integration with the Orion spacecraft - the agency plans to use its massive lift capability to carry nearly a dozen nano-satellites to conduct science experiments beyond low Earth orbit.

NASA's newest rocket will launch Orion on an uncrewed test flight to a distant retrograde orbit around the moon. Tucked inside the stage adapter - the ring connecting Orion to the top propulsion stage of the SLS - will be 11 self-contained small satellites, each about the size of a large shoebox.

"NASA is taking advantage of a great opportunity to conduct more science beyond our primary focus of this mission," said Jody Singer manager of the Flight Programs and Partnerships Office at the Marshall Space Flight Center in Huntsville, Alabama. "While this new vehicle will enable missions beyond Earth orbit, we're taking steps to increase the scientific and exploration capability of SLS by accommodating small, CubeSat-class payloads."

About 10 minutes after Orion and its service module escape the pull of Earth's gravity, the two will disconnect and Orion will proceed toward the moon. Once Orion is a safe distance away, the small payloads will begin to be deployed, all at various times during the flight depending on the particular missions.

These CubeSats are small nano-satellites designed to be efficient and versatile. The masses of these secondary payloads are light - no heavier than 30 pounds (14 kilograms) - and will not require any extra power from the vehicle to function. They will essentially piggyback on the SLS flight, providing what otherwise would be costly access to deep space.

"We are expanding the capabilities of this particular SLS test flight," said Joseph Pelfrey, deputy manager of the Exploration and Space Transportation Development Office at Marshall. "The rocket will be the strongest ever built by NASA and we want to take advantage of that design. Flying secondary payloads is something we plan to do for missions to come and provide the science community an opportunity they haven't had before."

The dispensers on the adapter ring will be built with commercially available materials. No pyrotechnic devices will be a part of the payloads and each will be ejected with a spring mechanism - similar to opening a lid on a toy jack-in-the-box.

The principal investigators and engineers for the payloads will work with the secondary payload integration team to develop mission-specific requirements and verify interfacing and safety requirements are met. Multiple organizations at NASA Headquarters in Washington are soliciting inputs for the available EM-1 secondary payload slots, and three have already been selected for further development: Near-Earth Asteroid (NEA) Scout, Lunar Flashlight and BioSentinel.

Both NEA Scout and Lunar Flashlight involve Marshall engineering and science teams, while BioSentinel is managed by NASA's Ames Research Center in California.

NEA Scout, using solar sail propulsion, will fly by a small asteroid, taking pictures and making observations that will enhance the current understanding of an the asteroid environment and will yield key information for future astronauts exploring an asteroid. "A solar sail works best when deployed in deep space and SLS will get us there," said Les Johnson, principal investigator for NEA Scout at Marshall. "It will take us out of Earth orbit and to interplanetary space - where we need to be to deploy the solar sail. It's a perfect ride to begin our mission."