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Emily LakdawallaSeptember 10, 2011

Here we go again: GRAIL set to launch today

GRAIL is trying for launch today at 8:29 PDT / 12:29 UT or 9:08 PDT / 6:08 UT., and here I am at 5:00 am my time ready to watch. As before, I'm watching the feed through Spaceflight Now's GRAIL mission status center. Another good place to watch will likely be JPL's Ustream channel. Here's the new launch timeline. Although the liftoff times are correct, the actual timelines after that may vary by a few seconds, especially after the first firing of the second stage. Every day that the launch is delayed, the two launch windows move earlier in the day by about four minutes.

Launch Time: 08:29:45 05:29:45 12:29:45
EventsecEDTPDTUTC
Liftoff 0.0 08:29:45 05:29:45 12:29:45
Ground-lit solid rocket motor (SRM) ignition (6 rockets) 0.2 08:29:45 05:29:45 12:29:45
Mach 1 29.0 08:30:14 05:30:14 12:30:14
Air-lit SRM ignition (6 rockets) 79.0 08:31:04 05:31:04 12:31:04
Ground-lit SRM jettison 80.5 08:31:05 05:31:06 12:31:06
Air-lit SRM jettison 159.5 08:32:25 05:32:25 12:32:25
Main engine cutoff (MECO) 263.2 08:34:08 05:34:08 12:34:08
First stage separation 271.2 08:34:16 05:34:16 12:34:16
Second stage ignition 276.7 08:34:22 05:34:22 12:34:22
Payload fairing jettison 281.0 08:34:26 05:34:26 12:34:26
Second stage first cutoff (SECO1) 429.7 08:36:55 05:36:55 12:36:55
Second stage restart 4076.7 09:37:42 06:37:42 13:37:42
Second stage second cutoff (SECO2) 4348.8 09:42:14 06:42:14 13:42:14
GRAIL-A separates
Separation should be visible from a RocketCam. After separation, the solar panels will be commanded to deploy.
4918.8 09:51:44 06:51:44 13:51:44
GRAIL-B separates 5413.8 09:59:59 06:59:59 13:59:59
EventsecEDTPDTUTC
Launch Time: 09:08:52 06:08:52 13:08:52
EventsecEDTPDTUTC
Liftoff 0.0 09:08:52 06:08:52 13:08:52
Ground-lit solid rocket motor (SRM) ignition (6 rockets) 0.2 09:08:52 06:08:52 13:08:52
Mach 1 29.0 09:09:21 06:09:21 13:09:21
Air-lit SRM ignition (6 rockets) 79.0 09:10:11 06:10:11 13:10:11
Ground-lit SRM jettison 80.5 09:10:12 06:10:12 13:10:13
Air-lit SRM jettison 159.5 09:11:31 06:11:31 13:11:32
Main engine cutoff (MECO) 263.2 09:13:15 06:13:15 13:13:15
First stage separation 271.2 09:13:23 06:13:23 13:13:23
Second stage ignition 276.7 09:13:29 06:13:29 13:13:29
Payload fairing jettison 281.0 09:13:33 06:13:33 13:13:33
Second stage first cutoff (SECO1) 430.4 09:16:02 06:16:02 13:16:02
Second stage restart 3951.0 10:14:43 07:14:43 14:14:43
Second stage second cutoff (SECO2) 4222.7 10:19:15 07:19:15 14:19:15
GRAIL-A separates
Separation should be visible from a RocketCam. After separation, the solar panels will be commanded to deploy.
4792.7 10:28:45 07:28:45 14:28:45
GRAIL-B separates 5287.7 10:37:00 07:37:00 14:37:00
EventsecEDTPDTUTC

Read more: GRAIL, events and announcements

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Emily Lakdawalla

Senior Editor and Planetary Evangelist for The Planetary Society
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