Re: Low orbit objects list?

From: George Roberts (
Date: Tue Mar 31 2009 - 14:59:49 UTC

  • Next message: John Burns: "Re: Low orbit objects list?"

    >I am trying to find objects in orbits below 400 km. I take photos of the
    Orbits aren't always circular but if you assume they are you can just look at 
    the orbits-per-day in the TLE.  Here is a sample TLE:
    1 70008U          09088.76122187  .00000000  00000-0  00000-0 0    07
    2 70008  28.6387  71.3876 7281669 274.1108  13.1898  2.35000000    05
    The 2.35000 number near the end of the second row is revolutions per day 
    (orbits-per-day).  Usually for low flying objects this is 14 orbits or more. 
    The lower the orbit, the more revolutions.  The ISS is about 15.7 (very low). 
    So you could download all TLEs from and sort them in excel by 
    But is this what you really want?  Maybe you want largest angular size?  That is 
    basically the same sort as brightest.  You could use heavens-above to grab the 
    brightest (mag 3.5 or brighter or change this to even brighter cutoff in the 
    url) and click "orbit" for each one and see the apogee and perigee heights.
    - George Roberts
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