orbit Arrival and initial operations At 75:55:54 into the mission, above the far side of the Moon, the CSM's service propulsion system (SPS) engine was fired for 356.1 seconds to slow the spacecraft into a lunar orbit of . This was followed, after two orbits of the Moon, with a 13.9 second firing of the SPS to circularize the orbit to at 80:25:08.1. Within the first couple of hours after the initial lunar orbit insertion burn and following the circularization burn, the crew turned to tracking planned landmarks on the surface below to record observations and take photographs. In addition to ALS-1, ALS-2, and ALS-3, the crew of Apollo 10 observed and photographed a number of features on both the near and far sides of the Moon, including the craters Coriolis, King and Papaleksi. Shortly after the circularization burn, the crew partook in a scheduled half-hour color television broadcast with descriptions and video transmissions of views of the lunar surface below. The LM crew, consisting of Stafford and Cernan, then prepared to enter the LM to check out its systems, which they did about an hour after the second burn. When they entered Snoopy, they were met with a blizzard of fiberglass particles from the earlier problem, which they cleaned up with a vacuum as best they could. Stafford had to assist Cernan in removing smaller bits that had become caught in the latter's hair and eyebrows. Stafford remembered that Cernan looked like he just came out of a chicken coop, and that the particles made them itch and got into the air conditioning system, and they were scraping it off the filter screens for the rest of the mission. This was merely an annoyance, but the particles may have gotten into the docking ring joining the two craft and caused it to misalign slightly. Nevertheless, Mission Control determined that this was still within safe limits. The flight of Snoopy After Snoopy was checked out by Stafford and Cernan, they returned to Charlie Brown for a rest period. Then, Young remained in Charlie Brown while Stafford and Cernan re-entered Snoopy and undocked it from the CSM at 98:29:20. Accordingly, Young became the first person to fly solo in lunar orbit. Following the undocking, Stafford and Cernan deployed the LM's landing gear and inspected the LM's systems. The CSM performed an 8.3 second burn with its RCS thrusters to separate itself