Orbit

Orbit Books is an international publisher that specialises in science fiction and fantasy books. It is a division of Hachette Book Group, owned by Lagardère Publishing.

From the Wikipedia article “Orbit Books”, licensed under CC BY-SA 4.0.

An imprint is a brand inside a larger publishing house, often with its own editors and list. Imprints of large groups usually acquire through literary agents; read recent titles to see whether your book fits the list, then target agents who sell to it.