Alexander,<br /><br />This is exactly what I received from Cape Canaveral Network Operations..<br /><br />Columbia and the STS-107 Crew departed Pad A 3016/15:39:00.075. The International Designator is 03003A and the Object Number is 20647. First<br />Vector following.<br /><br />However the launch time is used for calculating the rev number, so a small discression wont affect the TLE in anyway.<br /><br />I am guessing (as I do not know their source of 'launch time') they refer to launch time as actual SRB ignition, rather than physical liftoff.<br /><br />Our data courtesy of Cape Canaveral Network Ops is definately actual liftoff.<br /><br />If your interested, let me know and I can try to find out!