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



From: "Penny Fischer " <pennyo@prodigy.net>
>Bruce,
>I've seen what I thought was Barnards loop under low power in mediocre 
skies. But try as I might, I could not even imagine nebulosity around 
the Rosette Cluster.
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.
>I saw my first views of the NA Nebula this week in my friends 
Obsession, with what I think was an OIII filter, but that object is too 
extended and we could only see a portion (Gulf of Mexico region) of it. 
Still, I have to admit it was a grand object to view.
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!
Thanks for your excellent observations and discussion of the Pleiades 
:-)
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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