NASA's Lucy mission team is continuing efforts to correct the incomplete deployment of one of the spacecraft's solar arrays as it continues to Jupiter's Trojan asteroids.
The Lucy mission, which launched in October 2021, has two large, circular solar arrays, each spanning 24 feet (7 meters), to provide power for its pioneering voyage. However, one of the arrays failed to fully deploy after launch, posing a problem for the team. An update in January stated that the second array is a little less than 350 degrees deployed, due to an issue with a lanyard suspected to have prevented full deployment, but work to fix the issue has continued.
After a series of tests and measures, the team again commanded the spacecraft to deploy the solar array on May 26, using both primary and backup motors to try to tighten the lanyard and complete deployment.
"While the array still did not latch, the data indicates that it continued to further deploy and stiffen throughout the attempt," NASA Lucy mission representatives wrote in a June 8 update (opens in new tab). "The team has several more opportunities to repeat these deployment commands. While there is no guarantee that additional attempts will latch the array, there is strong evidence that the process is putting the array under more tension, further stabilizing it."
But even if the array does not fully deploy, Lucy may be able to fly as planned. For now, energy is not an issue, as the spacecraft is still relatively near the sun. Lucy carried out a successful trajectory correction maneuver on June 7 as part of preparation for its first Earth gravity assist, scheduled for Oct. 16.
The arrays have been designed to generate enough electricity while out at the orbit of Jupiter — an average distance of 484 million miles (778 million kilometers) from the sun.
Jupiter's Trojan asteroids orbit the sun ahead of and behind Jupiter, and no spacecraft has ever visited them. Scientists think these primitive rocks are remnants of the early solar system and could hold important clues about its creation.