The Press-Dispatch
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Stk#18316A $ 130 14 or only $ 6,400 /MO $ 0 DOWN 66 MONTHS 6.60 APR $ 26,300 $ 33,900 $ 29,200 Purdue scientist to lead next step in solar sailing By David Spencer Purdue News Service dspencer@purdue.edu A small satellite that will attempt the first controlled solar sailing in Earth orbit is a go for launch. Purdue professor Da- vid Spencer is the lead for LightSail 2, part of a payload that is scheduled to launch June 22 on SpaceX's Falcon Heavy rocket. The citizen- funded project from The Planetary Society is part of the U.S. Air Force's Space Test Program-2 payload. Solar sailing uses reflec- tive sails to harness the mo- mentum of sunlight for pro- pulsion. "While there have been several previous solar sail deployment demonstra- tion missions, if all goes as planned LightSail 2 will be- come the first spacecraft to increase its orbital ener- gy through controlling the sail orientation relative to the sun," said Spencer, an associate professor in Pur- due's School of Aeronautics and Astronautics and proj- ect manager for LightSail 2. Spencer has been in- volved with the LightSail program since 2010 and was mission manager for Light- Sail 1, which demonstrat- ed solar sail deployment in 2015. Video Of the history of the LightSail program, cour- tesy of The Planetary Soci- ety, is available here. A pho- to gallery is available here. LightSail 2 arrived at Ken- nedy Space Center in Cape Canaveral, Florida on May 21. It was integrated on May 7 with Prox-1, a satellite that includes a spring-loaded de- ployer, at the Air Force Re- search Laboratory in Albu- querque, New Mexico. Spen- cer led the development of the Prox-1 spacecraft while at Georgia Institute of Tech- nology. The Falcon Heavy will in- ject the combined Prox-1/ LightSail 2 spacecraft into orbit at an altitude of about 450 miles. One week af- ter launch, Prox-1 will de- ploy LightSail 2. Following a spacecraft checkout peri- od, LightSail 2 will deploy its solar panels and then un- furl its four solar sail seg- ments, providing a total sail area about the size of a box- ing ring. LightSail 2 will attempt to demonstrate solar sailing as a method for propulsion for CubeSats by perform- ing two "slews," or turns of the spacecraft, every orbit. The solar sail rotates edge- on and face-on to the Sun each orbit, giving the craft thrust to raise its orbit by about 500 meters per day during the early portion of the mission. The result is to increase the orbital energy about Earth, stretching the initial near-circular orbit in- to an ellipse. "While solar sails have been described in literature for many decades, solar sail- ing technology is still in its infancy," Spencer said. "Re- cently, solar sailing advance- ment has been enabled by miniaturized CubeSat tech- nology. "Through demonstrat- ing controlled solar sailing, LightSail 2 provides an im- portant advancement to- ward the realization of solar sailing's potential for space science applications." There are a handful of long-term, visionary appli- cations of solar sailing. A fleet of solar sail-pro- pelled spacecraft could mon- itor the space between the sun and the Earth to provide Earth an early warning for solar storms. A solar science mission could attempt to get into a polar orbit around the sun. Because of the limitless propulsion provided by solar photons, solar sailing has the potential to shorten the transfer times for missions that require large changes in velocity, including mis- sions to the outer limits of the solar system and inter- stellar space. "Solar sailing technology can enable missions to the extreme limits of our solar system with flight times of 25 years or less," Spencer said. Spencer's research team will track LightSail 2, re- ceiving the signal from the spacecraft as well as com- manding the spacecraft during operations, from the Space Flight Projects Lab at the Purdue Technology Center. Justin Mansell, one of Spencer's graduate stu- dents, is working on mod- eling and simulation of the mission and will compare that with actual flight data to evaluate the overall per- formance of the system. Funding for the project has been through The Plan- etary Society's members and private donors. "The LightSail program was citizen-funded and im- plemented by a team com- posed of small companies and universities," Spencer said. "The program dem- onstrates a new way of con- ducting space exploration, without relying on govern- ment agencies for funding." Live viewing will be avail- able at http://www.plan- etary.org/blogs/guest- blogs/2019/lightsail- 2-launch-event-preliminary- plans.html. Spencer's work aligns with Purdue's Giant Leaps celebration, acknowledg- ing the university's global advancements in space ex- ploration as part of Purdue's 150th anniversary. This is one of the four themes of the yearlong celebration's Ideas Festival, designed to showcase Purdue as an in- tellectual center solving re- al-world issues. The Planetary Society photo