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Re: (IAAC) Barnard's Loop, Naked Eye or Otherwise



Bruce,
:To actually see the Rosette Nebula, try any very low-power field with an
:O-III filter.  Using this combination, it's visible in any scope from an
:80mm (even binocs) on up.  My 8" F/6 used to give a great
:fill-up-your-field view at 37x (35mm eyepiece, 6mm exit pupil). An 8"
:F/5 would have been even better, yielding a little more space around the
:object and giving maximum contrast and exit pupil (7mm). I have to
:admit, were it not for filters, I wouldn't see half the great nebulae up
:there.
Bruce, thanks so much for these great tips. It will probably be a month or
two before the Rosette rises early enough to be able to stay up late enough
:) to see it, but I will keep this one in mind.  My eight inch would do fine
and I can borrow an Oxy filter from someone.  First I will probably try it
with my new UHC and see if I can discern anything.
:I think the Gulf region presents the highest contrast on the NA nebula
:and the sharpest cutoff between nebula and blackness.  If you get a
:chance, try a Shorttube or Pronto at low power with an O-III.
:Beautiful!
I should have done that this week at the starparty.  I viewed through both,
but not at anything extended, we were doing a short of test of scopes for a
friend who is in the market for his first.  I think we used Jupiter just to
compare a bright easy object for clarity and sharpness etc.
:Thanks for your excellent observations and discussion of the Pleiades
::-)
And same back to you!!
Penny
:
:Bruce Jensen
:**********************************************8
:>
:>Penny
:>-----Original Message-----
:>From: Bruce Jensen <brucejensen@hotmail.com>
:>To: netastrocatalog-announce@latrade.com
:><netastrocatalog-announce@latrade.com>
:>Date: Tuesday, September 22, 1998 3:06 PM
:>Subject: (IAAC) Barnard's Loop, Naked Eye or Otherwise
:>
:>
:>:From: Mel Bartels <mbartels@efn.org>
:>:
:>:>I've never seen Barnard's Loop, but a few amateurs have
:>:>reported this.  Unaided eye observing is a lot of fun and very
:>:rewarding - I encourage all to to try, and to spend time practicing
:the
:>:ability.
:>:
:>:Some friends and I have seen Barnard's Loop using an H-Beta filter and
:a
:>:Pronto late last fall at Fremont Peak in California; it appeared as a
:>:faint strand that could be traced several degrees along the eastern
:edge
:>:of Orion.  We did not try to see it naked eye or using a filter. I
:have
:>:occasionally tried this technique on such objects as the Rosette and
:>:North America Nebulae - the NA is pretty easy in most dark skies, but
:>:the Rosette has always stymied me with or without a filter.
:>:
:>:When I look at the Pleiades naked eye or filtered, all I see is a
:>:scattering of 6 or 7 stars (if I'm lucky) that are lopsided and blurry
:-
:>:astigmatism prevents high-definiton naked eye viewing.  There are a
:few
:>:guys out here who routinely count more than a dozen stars, though, and
:>:sometimes as high as 16 or even more.  Some wear glasses and some do
:>:not.
:>:
:>:Bruce Jensen
:>:
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:>
:>
:
:
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