P. Clay Sherrod Oct 27 6:30 AM
----- Original Message -----
From: "Rolf Stadelmaier" <rostm@...>
Sent: Sunday, October 27, 2013 8:25 AM
Subject: [guide-user] Comets mag, how true?
> since long I'm dealing with the question: How reliable are the given
> informations by Guide concerning the magnitudes of comets? I always
> thought, they must be very actual after downloading the newest data
> by using MPCORB.
> But: The latest pictures of ISON captured by amateurs are showing a far less
> shining comet than Guide suggests. Three days ago I for my own took the
> chance, to acquire a picture of this most promising comet to diagnose a very
> very great difference between Guide's information and reality. Although my
> local conditions for imaging had been very poor (foggy cloudy sky, gibbous
> wanning moon causing reflections, optics covered with damp) the result is
> obviously: ISON's magnitude compared to the magnitudes of stars in the
> imaged field is far beyond the value given by Guide of mag 8.8. It seems to
> correspond more to the values of stars with mag 13.4 or 14.2.
> Can anyone shed some light on this confusing behavior - Bill?
> Thoughts and explanations would bee much appreciated.
> Rolf Stadelmaier
> PS: To support my experience I uploded a picture to the Photo section.
> Please have a look.
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