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To: Boplicity who wrote (52369)	12/3/1999 1:01:00 PM
From: T L Comiskey	Read Replies (1) \| Respond to of 152472

Greg...OT....<.Mars Polar Lander > Mars Polar Lander Timetable TIME (ET) TIME FROM LANDING Dec. 3 8:21 a.m. -6 hours, 50 minutes If needed, thrusters fire for final course correction. 9:28 a.m. -5 hours, 33 minutes Heaters for descent engine turned on. 12:20 p.m. -2 hours, 41 minutes Heaters for descent camera turned on. 2:07 p.m. -54 minutes Entry, descent and landing sequence begins. 2:12 p.m. -49 minutes Helium tank pressurized. 2:46 p.m. -15 minutes Guidance system initialized. 2:49 p.m. -12 minutes Spacecraft turned for entry into Martian atmosphere; no more radio contact with Earth until after landing. 2:51 p.m. -10 minutes The ?cruise ring? and Deep Space 2 probes separate from the lander. 2:56 p.m. -5 minutes Lander enters atmosphere. 2:57 p.m. -4 minutes Descent radar powered on. 2:58 p.m. -3 minutes Descent camera powered on. 2:58 p.m. -2 minutes, 10 seconds Parachute deployed. 2:58 p.m. -2 minutes 3 seconds Descent imaging begins; heat shield jettisoned. 2:59 p.m. -1 minute 30 seconds Lander legs deployed; descent radar activated. 3:00 p.m. -53 seconds Radar detects ground. 3:00 p.m. -43 seconds Lander separates from back shell; descent engine fires. 3:01 p.m. 0 Touchdown. 3:06 p.m. +5 minutes Lander unfolds solar panels. 3:09 p.m. +8 minutes Medium-gain antenna pointed at Earth. 3:25 p.m. +24 minutes Lander radios Earth. The transmission sends its health and status, weather information and one black-and-white photograph. 4:59 p.m. +1 hour, 30 minutes Lander powers down to sleep and recharge. 5:24 p.m. +1 hour, 55 minutes Backup opportunity for radio transmission if spacecraft went into ?safe mode? during landing. 10:04 p.m. +6 hours, 35 minutes Lander wakes up and awaits instructions from Earth. 10:39 p.m. +7 hours, 10 minutes Deep Space 2 probes radio back data via Mars Global Surveyor. 11:39 p.m. +8 hours, 10 minutes Lander begins a 2«-hour transmission, which could include images from the descent and on the ground.