The Electron rocket took off from Rocket Lab’s launch facility in New Zealand at 5:55 AM ET, marking Rocket Lab’s 27th flight for its launch vehicle, and its first ever with the moon as the intended destination. The satellite will remain in low-Earth orbit for around six days, attached to a custom-designed Photon upper-stage created by Rocket Lab for this mission, after which Photon will ignite its engines a final time to leave Earth’s orbit on a path toward deep space, subsequently releasing CAPSTONE to continue on for arrival at the moon roughly three months from now.

The goal of the CAPSTONE mission is to use the small satellite to test a new orbit around the moon — an elliptical path that will provide a stable enough orbit to maintain a permanent base of operations for excursions to the lunar surface in Gateway, NASA’s planned moon space station, but also offer a good launch point for deeper space exploration at its furthest point. The lunar Gateway is a key ingredient for NASA’s Artemis program, which will return astronauts to the surface of the moon.

This is Rocket Lab’s first deep space mission, but it won’t be its last — the company is aiming to deliver two orbital spacecraft to Mars as well for a science mission also on behalf of NASA.