Re: TDF 1, or a different one?

From: Björn Gimle (b_gimle@algonet.se)
Date: Wed Sep 04 2002 - 14:32:09 EDT

  • Next message: Michael Waterman: "Long period satellites"

    > > The morning event is too late for the eastern states, near RA 1:15 and 3:30
    > > (near midway if cone angle = 90 deg).
    > >
    > > This means for 2002-09-04 around 11:05 over Austin, TX, 11:11 for San
    Antonio,
    > > 10:52 for Colorado and S.California
    >
    > After having a string of clear nights, clouds and rain rolled in last
    > night so no attempt was possible from San Antonio.  If you can give an
    > estimate of how the morning event will shift from day to day, I can try the
    > next time we have a clear morning.
    >
    >> my ballpark map says I'm ~~ 460 km S of Austin &
    >> ~~ 350 km S of San Antonio.  although I think Bjorn
    >> knows that.
    
    11:11 prediction was actually made for Paul's location, McAllen TX and 'San
    Antonio' was a memory glitch.
    
    For this morning event, RA/Dec (01:30, -8) will only move -0.5 m; +0.07 deg /
    day,
    but TDF 1 is about +12.5 min later at that position, so it will soon be lost for
    mid-US.
    
    The evening event(s) will be almost stationary at 12h00m +1 deg., on 09-14 TDF 1
    will be there at 23:58 UT; +13.3 min/day
    
    All these computed for McAllen, TX, but the daily differences are the "same"
    across US latitudes, and the position/time differences are much smaller than the
    error margin, since flashes have not been reported for 2.4 years, and the
    precession estimate is based on one obs by Rob Matson 3.0 years ago (who is
    RB -not in PPAS10- who observed it 99-08-17 and 18?)
    
    So, use the daily difference to find when NOT to look, after one or more
    reported non-obs periods.
    
    
    -- bjorn.gimle@tietotech.se (office)                         --
    -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    
    
    
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