Re: STS 115: estimated MECO elements

From: Björn Gimle (b.gimle@chello.se)
Date: Mon Aug 28 2006 - 09:23:37 EDT

  • Next message: Russell Eberst: "2006AUG28.OBS"

    Not directly, because the launch time is chosen to correspond to the
    position of ISS' ascending node, ie -27 min/day.
    In orbit, STS has the same longitude also has the same longitude
    27 minutes earlier in next day's orbit.
    But ISS makes 15.8 orbits/day, so it is +21/-72 min/day,
    and the approach  sequence must be different.
    
    However, in two days STS should be -54 min (early) and ISS -51 min,
    so you might make two approximately similar tables for odd/even dates.
    
    /Björn
    
    ----- Original Message ----- 
    From: "Dale Ireland" <direland@drdale.com>
    To: "'Ted Molczan'" <seesat-list@rogers.com>; "SeeSat-L" 
    <SeeSat-L@satobs.org>
    Sent: Sunday, August 27, 2006 6:56 PM
    Subject: RE: STS 115: estimated MECO elements
    
    
    > Hello
    > Is the time difference between the ISS and the Shuttle the same after a
    > certain period after launch even when the launches are rescheduled?
    > In other words, can you say that 3 hours after launch the STS will be
    > following the ISS by 35 minutes +/- 10 min (or whatever the launch window
    > is) and 12 hours after launch it will be leading by 15 minutes and 24 
    > hours
    > after launch it will be leading by 5 minutes etc etc.
    > Or does the rescheduling of a launch by a day or two totally change the
    > approach maneuvers?
    > So is it possible to make a little table with, roughly estimated ISS-STS
    > visual pass time difference vs. hours after launch, so one doesn't have to
    > hunt for the element sets to see STS?
    >
    > Dale
    >
    >
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