Re: Consider the moon

Tony Beresford (
Wed, 14 Jul 1999 11:10:21 +0930

At 10:03 14/07/99 , Karsten Isenberg wrote:
>I've got two "problems", I cannot solve:
>1.) Every satellite visible prediction software calculates the sun as
>the light source of reflecting satellites.
>The sun has a magnitude of -27. An iridium flare can reach a magnitude
>of -9.
>So, it is easy to understand, that the sun provides the light for the
>But, what about the moon. The moon can reach a magnitude of -12.
>Why doesn't any prediction software use the moon as a light source for
>satellite reflections?
Karsten, this has been tried successfully, but since the magnitude
involved is about 11 or 12 its of rather limited interest.

>Or what about an iridium flare, that is reflected to another iridium
>satellite and then it is visible on a special earth location?
This is even fainter by 4 magnitudes
>2.) An other thing I think all the time is that when the moon is in the
>sky, I cannot see a predicted satellite in the moon's near. The moon
>shines to bright. But predictions are made for that area.
Good idea  BUT Some people want to know when a satellite 
will transit the lunar disk though, and a filter like you propose
 would remove such predictions. I also expect nobody has succeeded
in quantifying the visibility of stars near the Moon sufficiently
well for it to be put into a computer programme. 
Tony Beresford
(34.96S, 138.633E, 100m ASL)