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Jason DavisJuly 17, 2019

LightSail 2 Team Continues Tweaks and Tests for Sail Deployment

The LightSail 2 mission team is continuing to tweak and test the spacecraft in preparation for solar sail deployment, which is scheduled for no earlier than 21 July 2019. Flight controllers successfully uploaded a software patch that refined the operation of the spacecraft's electromagnetic torque rods, which are responsible for keeping LightSail 2 stable as it circles the Earth. Spare bandwidth during ground station passes has also allowed for the downlink of 2 new high-resolution images.

Mexico from LightSail 2

The Planetary Society

Mexico from LightSail 2
This image of Earth, looking east across Mexico, was captured by LightSail 2 on 12 July 2019 at 22:11 UTC. The tip of Baja California can be seen at left. Tropical Storm Barry, in the Gulf Of Mexico, is visible in the upper right. The Moon is visible near the center-right edge of the picture; it appears rectangular due to its phase at the time and the camera’s limited number of pixels.
Caribbean Sea from LightSail 2

The Planetary Society

Caribbean Sea from LightSail 2
This image of Earth, looking at the Caribbean Sea towards Central America, with north roughly at the top, was captured by LightSail 2 on 7 July 2019 at 23:32 UTC. The blue-green color of the ocean around the Bahamas can be seen at the picture's 1:00 position. A lens flare is visible in the lower right.

Flight controllers placed the spacecraft's attitude control system in solar sailing mode for an entire orbit, and analyzed stored telemetry to see how well the spacecraft performed. LightSail 2 transmits telemetry in real-time, while also storing telemetry onboard for downlink later. 

The mission team spent extensive time evaluating updates to software handling of measurements from the spacecraft's Sun sensors, which track the position of the Sun during solar sailing. This was done in the lab at Cal Poly San Luis Obispo using BenchSat, LightSail 2's acrylic-mounted engineering clone. The team plans to place LightSail 2 in solar sailing mode again to validate tweaks made to the algorithms that process data from the Sun sensors. 

LightSail 2 remains healthy and stable in its current orbit. Ground stations at Cal Poly San Luis Obispo, Georgia Tech, Purdue University, and Kauai Community College continue to receive data from the spacecraft. A go for solar sail deployment is dependent on the mission team having a high degree of confidence that the attitude control system is ready for solar sailing, since atmospheric drag on the deployed sail limits the period in which LightSail 2's orbit can be raised. 

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Jason Davis

Digital Editor for The Planetary Society
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