Re: Satellites in moon light.

From: Mark Hanning-Lee (
Date: Fri Sep 28 2001 - 01:52:52 EDT

  • Next message: Bjoern Gimle: "Re: Satellites in moon light."

    Atul Sowani wrote:
    > So looks like observing moonlit satellites is a bit tricky.
    > Nevertheless, I would give it a try. Thanks to you all for
    > the tips!
    > Atul/25.Sep.2001
    > On Tue, 25 Sep 2001 11:19 +0200, Bjoern Gimle wrote:
    > > In IridFlar documentation Version 2.0
    > >                           -----------
    > >
    > > Lunar flare prediction added to IRIDFLAR.  A toggle has been added to
    > > the Main Menu (S, for Source) to select either the sun or the moon
    > > as the flare source.  For lunar flares, IRIDFLAR requires that the
    > > sun also be blocked by the earth.  (Diffuse solar reflection by
    > > Iridium is brighter than the brightest lunar specular reflection).
    > > You will need binoculars or a telescope to see lunar flares.
    > >
    > > (Source=Moon in the .cfg file)
    Belated reply: yes it can be tricky. If you see an Iridium flare, that's
    a flare to mag 8 or so. In a small scope like a 4", it's visible for
    about 1 sec, during which it moves about 1 degree. So you need to know
    just where to look.
    What to do: get Rob Matson's iridflar program which predicts lunar
    flares. Set it to predict all flares brighter than mag 13 for the next
    month or so.
    If it predicts a flare at mag 13, then adjust the longitude to find
    where the flare is brightest & drive there.
    See where the flare occurs in the sky e.g. az 267 degrees elevation 35
    Use your favorite planetarium program to see where that is in the
    starfield, e.g. 2 degrees N of a particular bright star.
    Ahead of time, point the scope in the right direction & wait.
    Using this approach, I've seen 1, Ron Lee has seen several.
    Look at the SeeSat-L archives.
    Good luck! Mark
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