RE: Cosmos 975 Rocket

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

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In reply to: Ulrich Beinert: "RE: Cosmos 975 Rocket"
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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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