The Heirotus Mission Specialist assigned to the Hemera, Jo Young is an expert on the operation of Holt-Rischmann sensor equipment, specifically the Deep Range Holt-Rischmann Device installed aboard the Discovery-class vessels contracted by Heirotus. The hardware has a lot in common with standard deep-range optical telescopes, so Jo splits her time between the Mission Package and assisting Spokes with astrometrics.