NASA’s Dawn spacecraft entered orbit around the asteroid Ceres on Friday morning at an altitude of just under 38,000 miles. Currently, the spacecraft is above the night side of Ceres, limiting the amount of information that can be gathered.

When conventional spacecraft enter orbit, they fire their engines for less than an hour to slow down and be captured by the gravity of their target. But Dawn is powered by an ion engine, which generates a small amount of thrust but can fire continuously for weeks, and there was no big change in Dawn’s course on Friday.