RE: ISS MARATHON SOUTH AFRICA

From: Dale Ireland (direland@drdale.com)
Date: Sat Nov 15 2008 - 16:41:36 UTC

  • Next message: Robert Holdsworth: "Re: ISS MARATHON SOUTH AFRICA"

      Tony
    I think that the "theoretical" best spot is one ISS footprint radii less
    than 51.6 which is about 35 degrees (north or south). This gives you the
    maximum consecutive passes combined with the longest period of darkness. Of
    course this supposes you could see a pass at zero elevation so practically
    the best spot is probably about 38 or 40 degrees and a horizon towards the
    pole.
    Dale
    
    > -----Original Message-----
    > From: Tony Beresford [mailto:dberesford@adam.com.au] 
    > Sent: Saturday, November 15, 2008 4:08 AM
    > To: seesat-l@satobs.org
    > Subject: Re: ISS MARATHON SOUTH AFRICA
    > 
    > At 07:33 PM 15/11/2008, GERHARD GROENEWALD wrote:
    > >Best attempt for me in RSA seems to be on the 16 th.
    > >
    > >4 in a row will be fine.
    > >
    > >what chances rain and clouds, let us see.
    > >2008-12-16 03:04:47 ISS                  137.6 32.9 -0.8   
    > 625 135.6 -21.1
    > >2008-12-16 04:39:45 ISS                  305.4 11.0  0.8  
    > 1266 120.6  -4.9
    > >2008-12-16 17:52:37 ISS                   54.6 11.4  1.0  
    > 1240 250.7  13.8
    > >2008-12-16 19:27:35 ISS                  222.4 31.6 -0.5   
    > 642 239.4  -4.9
    > Gerhard,
    > For an observer much nearer the southern or northern apex of 
    > the orbit there would be more passes between the first 2 you 
    > predict and the last 2.
    > You and I (-34.9 )are not far enough south to get the effect 
    > Kevin mentions on a 51.6 degree inclination orbit at 350km 
    > above the earth's surface.
    > A higher orbit and/or lower inclination would give the effect.
    > A selection of the Northern Hem. Observers on this list are 
    > in a better position relative to the apex.
    > Tony Beresford
    > 
    
    
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