Re: STS launch times

From: Antonín Vítek (
Date: Mon Sep 11 2000 - 06:53:03 PDT

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    I obtained following mail regarding my question about different STS
    launch times:
    -------- Original Message --------
    Subject: Re: STS launch times
    Date: Sun, 10 Sep 2000 10:10:29 -0500 (CDT)
    From: "David H. Ransom" <>
    Organization: NASA Spacelink-An Internet Resource for Educators
    To: Antonin Vitek <>
    The liftoff time that our team gives on STSTLE@SPACELINK.NASA.GOV is the 
    time of first motion as detected by a sensor on the pad and sent to us
    the DOD C-Band Radar Network along with their data. Johnson Space Center 
    uses a slightly different method to determine liftoff time but I don't 
    recall the exact details. Perhaps it's the opening of the pad hold downs 
    but I'm not sure.
    In any event, the difference is quite small, as you note. Since we get 
    our data very shortly after launch -- before the JSC time is available
    we use that time throughout the mission.
    Hope that helps ...
    David H. Ransom, Jr.
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