Lucy's Wobbly Wing: A Stuck Solar Array Six Weeks Into a 12-Year Journey

NASA’s Lucy spacecraft launched on October 16, and it’s already dealing with a hiccup that sounds more alarming than it apparently is. Not long after launch, mission engineers noticed that one of Lucy’s two large circular solar arrays hadn’t fully latched into its deployed position. It unfolded, mostly, but something is keeping it from clicking that last bit into place the way it’s supposed to.

Here’s why this matters: Lucy is headed on a genuinely wild 12-year tour of Jupiter’s Trojan asteroids, a population of rocky bodies trapped in gravitational sweet spots ahead of and behind Jupiter in its orbit. These asteroids are thought to be leftover material from the early solar system, essentially frozen relics from the formation of the outer planets. To pull off a mission this long and this far from the sun, Lucy needs those two enormous solar arrays working at full efficiency — they’re each about 24 feet across, since sunlight gets a lot weaker out past the asteroid belt.

The good news, and it’s genuinely good news, is that the array in question is still generating enough power to keep the spacecraft healthy. It didn’t fail to deploy, it just didn’t fully latch. Think of it like a folding table leg that swings out most of the way but doesn’t snap into its final lock. The spacecraft isn’t in danger right now, and mission control has the luxury of time to figure out what’s going on before it becomes a real problem.

Through November, the team has reportedly been running diagnostics, trying to characterize exactly what state the array is in and why the latching mechanism didn’t fully engage. This is the unglamorous side of space exploration that doesn’t get much attention: no dramatic photos, just engineers poring over telemetry data, running the deployment sequence through simulations, and weighing options for whether to attempt to re-latch it, live with it as is, or find some workaround.

It’s worth remembering that this kind of thing is not unprecedented. Deployable mechanisms — solar arrays, antennas, instrument booms — are some of the trickiest parts of any spacecraft, precisely because they have to survive the violence of launch folded up tightly and then unfold flawlessly in the vacuum of space, usually with no way to physically service them if something goes wrong. Lucy’s team has margin here because the array is still producing power, which buys them the runway to be careful rather than rushed.

Whether they attempt a fix in the coming weeks or decide the current configuration is good enough to complete the mission, this is a story worth watching. Lucy has years of cruising ahead before its first close asteroid encounter, so there’s no need to panic, but a spacecraft that’s supposed to run for over a decade ought to have all its hardware locked down properly before it gets too far from home. I’ll be curious to see whether NASA opts for an active fix or just monitors it and moves on.