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Re: (IAAC) limiting magnitude



Dear Mark,
    I attempted to solve the riddle of your faint star but without
success. This is a very remote and unlikely guess: could you have
mistakenly substituted a drawing of M65 in your M66 link? It is odd that
three stars in the actual nebula M66 at mag. 9.7, 12.9 and 13.06 were not
included in your drawing. Also, all pictures I have seen of M66 show it
as less flattened. Just a thought. Eugene O'Connor
deepsky wrote:
> Hi everyone,
>
> While observing m66 I notice a faint star, the
> third one from the top in the drawing, that was
> only visible in moments of good seeing.  The
> drawing can be seen at
> http://www.fortunecity.com/greenfield/twyford/637/drawings.htm
> I got to wondering about the limiting magnitude
> of this scope, a 40" f/5 dob, and found it to be
> 16.8. (My source, STAR WARES, did qualify this by
> saying that experienced observers under good
> conditions could beat this by .5 magnitudes or
> more.)  I realize this star isn't a good test of
> my observing skills in detecting faint stars
> since it was superimposed on the galaxy, but I
> would still be interested to know it's
> magnitude.  Megastar listed the star right above
> it at 15.4 but had no listing for the star in
> question.  Can anyone point me to a source for
> this information?  I won't be able to observe
> again until the 28th or 29th so looking up this
> info may help to alleviate the symptoms of
> withdrawal that are sure to develope<g>.
>
> Mark
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