LightSail Falls Silent Again as Battery Problem Suspected

The Planetary Society's LightSail-1 solar sailing spacecraft is scheduled to ride a SpaceX Falcon Heavy rocket to orbit in 2016 with its parent satellite, Prox-1. (Credit: Josh Spradling / The Planetary Society)
The Planetary Society’s LightSail-1 solar sailing spacecraft is scheduled to ride a SpaceX Falcon Heavy rocket to orbit in 2016 with its parent satellite, Prox-1. (Credit: Josh Spradling / The Planetary Society)

UPDATE: Ground controllers have received data packets from the satellite. They’re now analyzing them and planning their next move, which could be deployment of the solar sail.

It’s not looking good again for The Planetary Society’s LightSail spacecraft. After losing communications with the ground and then regaining it, the experimental CubeSat again fell silent after what appeared to be the successful deployment of its solar panels.

In an e-mail summary sent this afternoon, mission manager David Spencer said before contact was lost, LightSail’s batteries did not appear to be drawing current from the solar arrays; nor were they properly shunting power to the spacecraft’s subsystems.

“Following solar panel deployment,” he wrote, “it was noticed that all of the battery cells were drawing near zero current. This indicated that the batteries were likely in a fault condition stemming from the solar panel deployment event.”

Unless controllers can get the spacecraft online, it will not be possible to deploy the spacecraft’s solar sail.