Editor's Note: The launch window for STS-125 is defined by a requirement to capture HST on flight day three at an altitude of 350 miles. Launch will be targeted for 20 minutes after window open to improve ascent performance margins.

DATE.......WINDOW OPEN...LAUNCH........WINDOW CLOSE..HST CAPTURE

05/11/09...01:41:49 PM...02:01:49 PM...02:43:41 PM...Flight Day-3

05/12/09...01:11:12 PM...01:31:12 PM...02:13:07 PM...FD-3

05/13/09...12:40:38 PM...01:00:38 PM...01:46:52 PM...FD-3

05/14/09...12:14:24 PM...12:34:24 PM...01:16:14 PM...FD-3

05/15/09...11:43:46 AM...12:03:46 PM...12:45:39 PM...FD-3

05/16/09...11:13:10 AM...11:33:10 AM...12:19:27 PM...FD-3

05/17/09...10:42:35 AM...11:02:35 AM...11:48:48 AM...FD-3

05/18/09...10:16:21 AM...10:36:21 AM...11:18:11 AM...FD-3

05/19/09...09:45:43 AM...10:05:43 AM...10:47:36 AM...FD-3

05/20/09...09:15:07 AM...09:35:07 AM...10:21:23 AM...FD-3

05/21/09...08:44:37 AM...09:04:37 AM...09:50:45 AM...FD-3

05/22/09...08:18:17 AM...08:38:17 AM...09:20:09 AM...FD-3

05/23/09...07:47:40 AM...08:07:40 AM...08:49:34 AM...FD-3

05/24/09...07:17:05 AM...07:37:05 AM...08:23:19 AM...FD-3

05/25/09...06:50:52 AM...07:10:52 AM...07:52:42 AM...FD-3