1. The spacecraft would land 21 minutes and 49 seconds after retrofire . 2. A large object was jettisoned when the craft was preparing for retrofire . 3. Glenn gave a ten-second countdown to retrofire . 4. After undocking, the spacecraft performs a retrofire and burns up in the atmosphere. 5. The spacecraft was maneuvered into retrofire attitude and the first retrorocket fired . " Roger. 6. The spacecraft attitude was steady during retrofire . 7. He allowed the spacecraft to continue to its normal second orbit retrofire position near California. 8. It is the first spacecraft to use a ceramic ( silicon nitride ) retrofire thruster. 9. The retrofire , re-entry, and landing took place without incident on 23 September. 10. Retrofire was initiated over Hawaii at 190 hours, 27 minutes, and 43 seconds into the mission.