CAPSTONE's unique near rectilinear halo orbit around the Moon. Credits:
Advanced Space
It will have equilibrium. Poise. Balance. This pathfinding CubeSat will
practically be able to kick back and rest in a gravitational sweet spot in
space – where the pull of gravity from Earth and the Moon interact to allow for
a nearly-stable orbit – allowing physics to do most of the work of keeping it
in orbit around the Moon.
Sounds like a heavenly work-life balance, right? Funnily enough – the orbit
is formally known in orbital mechanics as a "near rectilinear halo orbit"
(NRHO). Which means, if you were able to trace the shape of the orbit, it would
look like an elongated oval with sides so long they're nearly straight.
The Cislunar Autonomous Positioning System Technology Operations and
Navigation Experiment (CAPSTONE) CubeSat owned and operated by Advanced
Space in Westminster, Colorado, will be the first spacecraft to test this
orbit. Researchers want to show the orbit requires less fuel and allows
constant direct communications contact with Earth as the spacecraft passes by
the Moon.
And NASA has big plans for this unique type of orbit. Engineers expect it
will allow them to park bigger spacecraft – including the lunar-orbiting space
station Gateway – in orbit around the Moon for about 15 years.
About six days after launch, CAPSTONE will deploy from the Rocket Lab
Photon spacecraft bus and begin its four-month transfer to its NRHO, firing its
thrusters to power its journey. After a couple of additional
"clean-up" maneuvers, and a critical maneuver that will insert the
spacecraft into the NRHO, the spacecraft will occasionally and sparingly fire
its thrusters to stay on course, allowing NASA to understand the orbit dynamics
for at least six months.
"CAPSTONE will be precisely controlled and maintained and will benefit
tremendously from the nearly-stable physics of its near rectilinear halo
orbit," said Elwood Agasid, deputy program manager of Small Spacecraft
Technology at NASA's Ames Research Center in California's Silicon Valley.
"The burns will be timed to give the spacecraft an extra boost as it
naturally builds momentum – this requires a lot less fuel than a more circular
orbit would require."
If viewed from Earth, CAPSTONE's orbit would repeatedly trace a consistent
oval around the Moon as the spacecraft moves from the lunar North Pole to the
lunar South Pole. It will take nearly a week to complete a full lunar orbit.
While it's over the South Pole, the spacecraft will be traveling at its slowest
and farthest away from the lunar surface – approximately 47,000 miles (76,000
kilometers) above the Moon. Then, as it builds momentum, the spacecraft will
travel at its fastest and closest height above the Moon and cross over the
North Pole, at only approximately 2,100 miles (3,400 kilometers) high.
"This orbit has an added bonus of allowing Gateway to have optimal
communications with future Artemis missions operating on the lunar surface as
well as back to Earth," said Agasid. "This could unlock new
opportunities for future lunar science and exploration efforts."
Learn more:
For researchers:
CAPSTONE is commercially owned and operated by Advanced Space
in Westminster, Colorado. It represents an innovative collaboration between
NASA and industry to provide rapid results and feedback to inform future
exploration and science missions.
NASA’s Small Spacecraft Technology program within the agency’s Space
Technology Mission Directorate (STMD) funds the demonstration mission. The
program is based at NASA’s Ames Research Center in California’s Silicon Valley.
The development of CAPSTONE’s navigation technology is supported by NASA’s
Small Business Innovation Research and Small Business Technology Transfer
(SBIR/STTR) program, also within STMD. The Artemis Campaign
Development Division within NASA’s Exploration Systems Development Mission
Directorate funds the launch and supports mission operations. The Launch
Services Program at NASA’s Kennedy Space Center in Florida manages the launch.
Source: CAPSTONE
Charts a New Path for NASA's Moon-Orbiting Space Station | NASA
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