(IAAC) Re: [ATMoB-discuss] Seeing the Rosette... nebula visibility ratings?

jeff at antistatic.com jeff at antistatic.com
Sat Sep 4 15:31:43 EDT 2004


Hey, thats great.  There is a lot of info there!

Please put me on the list.  I just put a digital voice recorder in my 
equipment case to make this sort of thing easier.

Thanks!

-Jeff



On Fri, 3 Sep 2004, Lewis J. Gramer wrote:

> Jeff, I run a Website and email list for deep-sky observers,
> called the "IAAC": the whole idea is that there ISN'T any one
> number (Vmag, Bmag, surface brightness, isophote sizes - nor
> your Limiting Magnitude, Telescopic LM, seeing rating, etc.)
> which really tells you whether a particular object SHOULD be
> visible, nor what it will look like ("how well" you see it),
> nor how BEST to see it (with a UHC, OIII, H-beta, no filter,
> what magnification, aperture, what conditions, etc.)!
>  http://www.visualdeepsky.org
>
> Instead, the best guide to what YOU might see (and the best
> way to challenge yourself to see more, without just getting
> overly frustrated) - the best way to judge that, is by what
> OTHER observers have actually seen!
>
>
> So for example, if you go onto the IAAC search page:
>  http://www.visualdeepsky.org/search.html
>
> and you search for the common name "Rosette", you will see
> that it consists of a complex of individual NGC objects,
> including open cluster NGC 2244, and several "pieces" of
> nebulosity (NGC 2237, NGC 2238, NGC 2239, NGC 2246), plus
> still more possibly "involved" objects within a 1o radius.
>
> The result of this search is also a nice list of actual
> observations - from people all over the Web who chose to
> contribute their observations to the IAAC (among them,
> Sue French, Martin Baur, Michael Geldorp, and me!)
>
> Notice that several people made attempts to see the Rosette
> with similar apertures to yours and NO filter - and some also
> with smaller apertures than you and an H-beta or other filter.
>
> It is indeed a tricky one to see - so you might guess that it
> would be very dependent on conditions, including the altitude
> of the object above your horizon, moonlight, light pollution,
> etc. Note in particular, that someone DID see the nebulosity
> (including structure!) from a "rural" site, with an 8" scope
> using medium to high power, both with and without an OIII:
> http://www.visualdeepsky.org/logs/msg03130.html
>
>
> I hope this helps answer your question, Jeff. And by the way,
> if YOU would like to share your observing logs for this or any
> other object - whether they're successful or not - we would
> certainly welcome them on the IAAC! Just drop me an email, if
> you would like to join the list or just contribute a few logs.
>
> Clear skies!
> Lew
>
>
> Lew Gramer <owner at visualdeepsky.org>
> Webmaster: http://www.visualdeepsky.org
>
>
>
>> -----Original Message-----
>> From: atmob-discuss On Behalf Of Jeff
>> Sent: Friday, September 03, 2004 1:16 PM
>> Subject: [ATMoB-discuss] Seeing the Rosette... nebula
>> visibility ratings?
>>
>> So I've been hunting diffuse nebula with my 6" dob and a UHC filter.
>>
>> I've found lots of them in Saggatarius, and I've found the Veil (both
>> parts) and even the North American.  This was from the cape
>> in a sky that
>> is slightly worse that the one at the clubhouse.
>>
>> I can't see the Rosette nebula.  I KNOW I'm looking at it as
>> the central
>> star pattern is very distinctive, but I still can't see it.
>> I've looked
>> for it with my 8" as well.  Has anyone seen this?
>>
>> I found the object database from
>>
>> http://www.saguaroastro.org/content/downloads.htm
>>
>> which listed surface brightness for many objects, but not
>> diffuse nebula.
>> Anyone know of such a list?  I'd love to prioritize my
>> observing working
>> from easiest to hardest.  I guess I could make my own by dividing
>> magnitude by object area, but it wouldn't be as accurate.
>>
>> Thanks for any light anyone can shed on this!
>>
>> -Jeff
>
>
>


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