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Hrundi
Pooh-Bah
Reged: 02/06/08
Posts: 1237
Loc: Estonia
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I just observed the rosette nebula region with 100mm binoculars at a red zone. Of course any observations of such nebulae aren't really meant to be from locations like this, but I thought I'd give it a shot.
I didn't see anything I could describe as a nebula, but I did see NGC 2244, the open cluster.
What I saw around the rosette, however, was what I could only describe as 'dark nebula' like features. Basically a large circular region around that star cluster was, although not brighter, felt 'detached' from the surrounding star fields. There were far less stars, and it felt a bit off. Kind of hard to describe.
So did I see some sort of dark features around it? Or just nothing.
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Edited by Hrundi (10/30/09 02:27 AM)
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 8280
Loc: Beatrice, Nebraska
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Quote:
I just observed the rosette nebula region with 100mm binoculars at a red zone. Of course any observations of such nebulae aren't really meant to be from locations like this, but I thought I'd give it a shot.
I didn't see anything I could describe as a nebula, but I did see NGC 2239, the open cluster.
What I saw around the rosette, however, was what I could only describe as 'dark nebula' like features. Basically a large circular region around that star cluster was, although not brighter, felt 'detached' from the surrounding star fields. There were far less stars, and it felt a bit off. Kind of hard to describe.
So did I see some sort of dark features around it? Or just nothing.
Well, NGC 2239 is not the cluster (NGC 2244 is the central group of stars surrounded by the Rosette NGC 2237). With a nebula filter held up to my unaided eye, I can often see the Rosette as a small "puff" of light. In a pair of binoculars from a dark sky site, I see a small box-shaped open star cluster with a very faint irregular halo around it. In my 100mm f/6 refractor, it is a delicate faint diffuse wreath of hazy light around the star cluster NGC 2244, but with a nebula filter, it gains a huge amount of contrast and starts to look a lot like some of the images of it. With a narrow band nebula filter (Lumicon UHC, DGM NPB, etc.), it shows much irregular structure with the cluster existing in a "hole" in the middle. With an OIII filter, individual filament-like patches are seen with higher contrast, although the nebula appears a bit smaller than it does in the narrow-band filters. There are even a few smaller dark spots in and between the patches when viewed in my 10 inch with the OIII filter at 47x. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
Prairie Astronomy Club
http://www.prairieastronomyclub.org
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Hrundi
Pooh-Bah
Reged: 02/06/08
Posts: 1237
Loc: Estonia
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Sorry, yeah, got my ngc number mixed up. I meant NGC 2244. Updated the original post 
I definitely don't think I saw anything as a contrasty glow of light, and I used no filters. But despite that, the region around it sort of looked wrong to my eyes. It definitely had less stars.
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exile
super member
Reged: 01/15/08
Posts: 118
Loc: Guangzhou, China
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Yes, you are 'seeing' the Rosette - sort of. The nebula tends to be detectable by the way it obscures the background stars; the sky seems 'empty'. In a very dark sky, you can make out the very faint 'ring' in binoculars. A wide field really helps here.
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90mm Scopos f6.7 Apo Triplet on EQ2
Tak FS78 f8.1 on Vixen SP
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Dave Mitsky
Postmaster
Reged: 04/08/02
Posts: 10499
Loc: PA, USA, Planet Earth
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I've seen NGC 2237 (or whatever you want to call the Rosette Nebula) as an annulus a number of times from dark sites with binoculars, the smallest being my 8x42 Celestron Regals. Through my filtered 101mm Tele Vue refractor, the nebula is somewhat brighter on one side than the other. Larger telescopes improve the view up to a point, as the nebula at 80' x 60' is rather big.
Dave Mitsky
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Chance favors the prepared mind.
De gustibus non est disputandum.
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Tony Flanders
Post Laureate
Reged: 05/18/06
Posts: 3469
Loc: Cambridge, MA, USA
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Quote:
What I saw around the rosette, however, was what I could only describe as 'dark nebula' like features. Basically a large circular region around that star cluster was, although not brighter, felt 'detached' from the surrounding star fields. There were far less stars, and it felt a bit off. Kind of hard to describe.
Great observation! All nebulae block the stars behind them, though some of those nebulae also glow by their own light. In fact, a bright nebula is no different from a dark nebula except that it happens to be lit up.
I'm sure you can see the bright part with your 100-mm binos, but I bet you'll need *much* darker skies.
A nebula filter makes a *huge* difference with this particular object.
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Tony Flanders
First and foremost observing love: naked eye.
Second, binoculars.
Last but not least, telescopes.
And I sometimes dabble with cameras.
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Ptarmigan
Carpal Tunnel
Reged: 09/23/04
Posts: 2356
Loc: Arctic
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I remember another CN'er saw the Rosette Nebula in light polluted Hong Kong with binoculars.
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Ptarmigans=Cute and Cuddly
Meade Starfinder 8
Nikon 10x50
Rebel XT
Edited by Ptarmigan (10/30/09 01:41 PM)
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Cygnus_x1
Sketcher Extraordinaire
Reged: 11/17/04
Posts: 2387
Loc: 50N - too far north!
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I have seen the Rosette with 8x42 binoculars from my backyard (mag 6.0 to 6.5 sky), I was also using OIII and UHC filters.
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Visual Deep Sky Observing - being rebuilt
Observing blog
My astronomy event photos on Flickr
12 inch Dob
8 inch Celestron C8 Newtonian
4 inch Meade SCT
8x42 Leica binoculars
Various TeleVue eyepieces
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Astrojensen
sage
Reged: 10/05/08
Posts: 219
Loc: Bornholm, Denmark
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As David pointed out, in a dark sky, the Rosette is not difficult at all. The cluster is a fairly easy naked-eye target and the nebula can be seen when holding a nebula filter up in front of your eye. I haven't done it myself, though, but I have seen the Rosette several times each winter with all my binoculars for many years, the smallest being a 8x21. I have no trouble picking it up in the 8x21.
Clear skies!
Thomas, Denmark
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Loren Toole
super member
Reged: 03/23/04
Posts: 123
Loc: New Mexico USA
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I saw this object well for the first time last February, on a really cold, dark night. I had suspected seeing it in a variety of smaller scopes and binos for years, however, this year was different. I used my 4" f5 Genesis and a UHC filter. The 24 Panoptic was great for this view, you'd need at least 2 degree field or larger to do justice to the nebula. I was astonished to see it as a clearly annular object, with subtle swirls in the nebula. As David Knisely said, brightness varies across the nebula but the entire annulus is visible with averted vision.
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My binos: 6x30, 7x35, 10x70, 15x60, 20x80
My scopes: 5"f5 newt, 4"f5 TV Genesis, 4"f5 TV 101, 3"f9, 3"f5
ARCO OBSERVATORY 7200'
Edited by Loren Toole (10/31/09 08:23 AM)
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Carol L
Reged: 07/05/04
Posts: 6034
Loc: Tomahawk, WI 45N//89W
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Here's what it looked like earlier this year with the 80ST...
reminded me of the Triffid, actually. 
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 Authoring the monthly AstroSketch page in "Sky at Night" magazine
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