Re: Iridium 56 (25170) flare between -3 and -4

From: Björn Gimle via Seesat-l <>
Date: Wed, 27 Jan 2016 11:15:27 +0100
Your message says predicted mag 0.5, ie a diff of about 4 in  mag.
If I am not mistaken, the design specs for Iridium allow a deviation from
local vertical up to 0.5°
The change in mag due to the flare angle used by Rob Matson in IridFlar
(16-bit Windows / DOS) is shown in attached graph (from a list of
predictions). Very small decrease until the solar reflection hits the Sun's
edge, then about 4 at 0.5° !

So this is barely acceptable (and not a prediction error), but it could be
interesting to follow up in case it continues for the same Iridium.
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Received on Wed Jan 27 2016 - 04:15:49 UTC

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