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Dain
Carpal Tunnel
Reged: 03/24/05
Posts: 1596
Loc: N.Y. Adirondack Mnts. NGC 4565...
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Hey folks,
There are a few galaxies in Orion that have piqued my curiosity, specifically NGC 1729, NGC 1740 and NGC 1875. I have none of these in my logs so I'll be working on these when the time comes to observing from dark skies. Some of these look like tough lil' fellas and may take more aperture then what I'm working with...but I'm aways up for the challenge! If any of you folks would like to share your observations on these, feel free. I'd be interested in seeing the different observations you have on these through the eyepiece. Thanks!
Clear Skies to All!
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Best,
Dain
Adirondack Mountains (my true dark sky site)
@ Cedar River Flow
Local Site
Clear Skies?
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exile
super member
Reged: 01/15/08
Posts: 118
Loc: Guangzhou, China
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Have you bagged NGC 1924, Dain? Lies just 1 degree east of M42 - I think this is the brightest of Orion's galaxies. Interesting because of its proximity to the nebula..
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90mm Scopos f6.7 Apo Triplet on EQ2
Tak FS78 f8.1 on Vixen SP
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JakeSaloranta
sage
Reged: 09/18/08
Posts: 234
Loc: Sisu, Sauna, Sibelius...
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I've seen these from Orion with the given instruments:
NGC 1682 13.5 (v) 0,8' x 0,8' 8"
NGC 1684 12.0 (v) 2,4' x 1,6' 4.7"
NGC 1713 12.8 (v) 1,7' x 1,3' 8"
NGC 1762 12.6 (v) 1,7' x 1,2' 8"
NGC 1875 13.7 (v) 0,8' x 0,7' 8"
NGC 1924 12.4 (v) 1,5' x 1,1' 8"
MCG -1-15-3 mag? 1.0' x 1.0' 4.7"
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Jim Curry
sage
Reged: 10/29/07
Posts: 432
Loc: Maine
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Pretty faint stuff. What are you going after them with, Dain.
Jim
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Vixen 140 refractor
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Ptarmigan
Carpal Tunnel
Reged: 09/23/04
Posts: 2356
Loc: Arctic
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Hmmmmm, I wonder if it can be seen with an 8 inch telescope?
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Ptarmigans=Cute and Cuddly
Meade Starfinder 8
Nikon 10x50
Rebel XT
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Achernar
Postmaster
Reged: 02/25/06
Posts: 5025
Loc: Mobile, Alabama, USA
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It looks like all of them should be visible through a 10-inch from a decent site. I recently hunted down galaxies just as small and faint in Aquarius, Delphinus and Equuleus. When they're an arc minute or less across, they stand out quite well against the surrounding stars at 190 or 200X.
Taras
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15-inch F/4.5 Dob under construction
10-inch F/4.5 Discovery Dob
6-inch F/8 Homebuilt Dob
4 1/4-inch F/4 Homebuilt reflector
A whole bunch of eyepieces, filters and other accessories....
Two curious cats
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Robin
journeyman
Reged: 09/14/08
Posts: 8
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Hi,
observing galaxies in Orion sounds like a very interesting project!
Some time ago I was able to see NGC 1924 with an 8" Dobsonian scope at excellent conditions in the mountains. I was surprized by how easy it was.
Quote:
MCG -1-15-3 mag? 1.0' x 1.0' 4.7"
I just looked up this one in the Deep Sky Browser ( www.messier45.com ). According to this database it is a reflection nebula. Which one is correct?
Clear skies
Robin
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JakeSaloranta
sage
Reged: 09/18/08
Posts: 234
Loc: Sisu, Sauna, Sibelius...
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Quote:
I just looked up this one in the Deep Sky Browser ( www.messier45.com ). According to this database it is a reflection nebula. Which one is correct
NED has it as a nebula and it sure does look like a reflection nebula to me.
/Jake
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Dain
Carpal Tunnel
Reged: 03/24/05
Posts: 1596
Loc: N.Y. Adirondack Mnts. NGC 4565...
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Hello All.
Thanks for all the help. I see there's a few more galaxies listed above that I've happened to miss as well. I'll be bringing my long time 8-inch dob with me to some dark skies. A few may be out of my reach but as I mentioned earlier, I'll take the challenge.
Clear Skies to you all!
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Best,
Dain
Adirondack Mountains (my true dark sky site)
@ Cedar River Flow
Local Site
Clear Skies?
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bicparker
Carpal Tunnel
Reged: 02/07/05
Posts: 1706
Loc: Plano, TX
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A SIMBAD query lists MCG -1-15-3 as a galaxy (but note the difference below) in accordance with its catalog, however, when you pull up the image using the color bands, it certainly has the characteristics of a reflection nebula. The DSS2 plate and the SIMBAD data under the Aladin sky atlas viewer have the area labeled as a bright nebula with a molecular cloud surrounding (the molecular cloud is pretty visible in the DSS plates, too). They also label the center of the reflection nebula as, a reflection nebula. I assume this is due to spectroscopic data that has been measured on that object (I didn't take the time to pull that data out). In any case, it all makes sense in the context of its location.
So I think it is safe to say Reflection Nebula for this, at least the visual portion.
The MCG (Morphological Catalog of Galaxies) is older and doesn't necessarily reflect newer spectroscopic data that might otherwise vet out false positives.
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Bic Parker
17.5" f/5 dob
10" f/10 SCT
5" f/8 refractor
80mm f/6 refractor
66mm f/6 refractor
Plus a few others out of the rotation
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sgottlieb
sage
Reged: 07/22/07
Posts: 339
Loc: SF Bay area
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Quote:
A SIMBAD query lists MCG -1-15-3 as a galaxy (but note the difference below) in accordance with its catalog, however, when you pull up the image using the color bands, it certainly has the characteristics of a reflection nebula. The DSS2 plate and the SIMBAD data under the Aladin sky atlas viewer have the area labeled as a bright nebula with a molecular cloud surrounding (the molecular cloud is pretty visible in the DSS plates, too). They also label the center of the reflection nebula as, a reflection nebula. I assume this is due to spectroscopic data that has been measured on that object (I didn't take the time to pull that data out). In any case, it all makes sense in the context of its location.
So I think it is safe to say Reflection Nebula for this, at least the visual portion.
The MCG (Morphological Catalog of Galaxies) is older and doesn't necessarily reflect newer spectroscopic data that might otherwise vet out false positives.
This object is also catalogued as reflection nebula vdB 54. There is a separate entry for vdB 54 in SIMBAD, but unfortunately the MCG "galaxy" and the vdB reflection nebula are not equated in SIMBAD, despite the positions being roughly the same! It makes sense to just refer to this object as vdB 54 to avoid confusion, since it's not a galaxy. Here's a visual observation I made 9 years back with a 17.5" --
vdB 54
05 41 54.8 -06 15 09
V = 9.5 (central star)
This reflection nebula, which is located less than two degrees ESE of the Orion Nebula, appears as a faint, circular, 1.5' glow around a mag 9.5 star. The halo appears to fade smoothly into the background.
Surrounding the star BD-06 1287. On the red DSS this appears to be a relatively bright nebulosity with an embedded illuminated star which is difficult to distinguish. Listed in MCG as M-01-15-003 with the comments "...in a perfectly starless sky background [the area is obscured by Lynds dark nebula 1641]. It has red jets, but to me seems regular and its nucleus is visible." In NED, it is listed as a galactic nebula with the note "This is a galactic diffuse nebula".
I think I first heard of this object from Dave Riddle who specializes in obscure emission and reflection nebulosities.
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Steve Gottlieb
18" f/4.3 Starmaster
Adventures In Deep Space
7500+ NGC/IC Visual Descriptions
NGC/IC Project
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NGC 4565
member
Reged: 09/11/07
Posts: 81
Loc: Oakland, Ca
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With an 18" scope.
1729 - Medium size, diffuse even glow. Next to mag 10.7 star. Makes for a difficult observation.
That's the only one I've observed from your list!
Richard
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Richard Navarrete
18" Obsession
TV 101
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