RE: Cosmos 975 Rocket

From: Tony Beresford (aberesford@iprimus.com.au)
Date: Tue Dec 19 2000 - 21:31:42 PST

  • Next message: Russell: "DEC18.OBS"

    At 04:20 20/12/00 , Ulrich Beinert wrote:
    >"standard magnitude" referred to in the right column of the Viewing
    >Opportunities window? Is this visual magnitude, like a star's mag? Or is it
    >something else? 
    Ulrich,
    yes Standard magnitude refers to satellite brightness at 1000Km range and 
    50% illumination. Just like astronomical absolute magnitude information.
    Meteoricists use an absolute magnitude at 100Km, and solar system astronomers
    use an absolute magnitude based on a 1 AU distance ( 149.& million km)
    
     The calculated magnitude (if given in predictions) is adjusted for range and percentage illumination.
    Tony Beresford
    
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