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EdK
member
Reged: 09/28/09
Posts: 10
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Someone gives this object a mag. of 13.3 looks a bit brighter than that in my 11 on my CGE mount.
I have semi fair dark sky. with a couple of street lights near me. I was surprised at the detail of this object ..It stands out as soon as the scope gets to it ..I didnt try high mag on it was using a 24 MM Konig from University Optics one of my all time fav eye pieces, with a LP filter. Any way just thought I would role this one by the room ..
Ed
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starrancher
professor emeritus
Reged: 06/09/09
Posts: 606
Loc: Northern Arizona
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Quote:
Someone gives this object a mag. of 13.3 looks a bit brighter than that in my 11 on my CGE mount.
I have semi fair dark sky. with a couple of street lights near me. I was surprised at the detail of this object ..It stands out as soon as the scope gets to it ..I didnt try high mag on it was using a 24 MM Konig from University Optics one of my all time fav eye pieces, with a LP filter. Any way just thought I would role this one by the room ..
Ed
The NGC/IC Project lists this object as having an 11.5 visual magnitude & shows a 13.3 blue magnitude .
I think that the blue magnitude is something to do with photo or imaging & if that isn't the case , someone please correct me . I should research this on my own but I'm feeling rather lazy at this point . 
But you also have to consider that this object only sports an apparent size of less than one arc minute so as the light is fairly well confined in a small area .
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LXD75 AR5
LXD75 SN8
Series 4000 Plossls
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Fort Rock , Az .
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 8279
Loc: Beatrice, Nebraska
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Quote:
Someone gives this object a mag. of 13.3 looks a bit brighter than that in my 11 on my CGE mount.
I have semi fair dark sky. with a couple of street lights near me. I was surprised at the detail of this object ..It stands out as soon as the scope gets to it ..I didnt try high mag on it was using a 24 MM Konig from University Optics one of my all time fav eye pieces, with a LP filter. Any way just thought I would role this one by the room ..
Ed
The 13.3 figure is the photographic magnitude, which rarely is very close to the visual one. The data from Doug Snyder's Planetary Nebula Home page lists its visual magnitude as 11.58. 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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Tony Flanders
Post Laureate
Reged: 05/18/06
Posts: 3469
Loc: Cambridge, MA, USA
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Quote:
Someone gives this object a mag. of 13.3 looks a bit brighter than that in my 11 on my CGE mount.
Magnitudes for planetary nebulae are notorious. The problem is that they emit most of their light in one very narrow bandwidth -- which happens to be very close to the maximum sensitivity of the human eye. So they almost always look much brighter than their stated magnitudes imply.
But with small, intense planetaries like this, *always* try bumping up the magnification as far as the seeing will allow. Many of them reveal small-scale structure that's very hard to see at low power.
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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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sgottlieb
sage
Reged: 07/22/07
Posts: 339
Loc: SF Bay area
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Quote:
But with small, intense planetaries like this, *always* try bumping up the magnification as far as the seeing will allow. Many of them reveal small-scale structure that's very hard to see at low power.
Tony's right about "magging up" on small, high surface brightness planetaries to look for small details. Here's how NGC 1501 appeared in my 18-inch Starmaster two years back --
Superb view at 450x in good seeing. The 1' diameter disc is slightly elongated ~E-W, ~60"x50" with a very narrow, brighter rim and darker center. The mag 14.4 central star was steadily visible. On closer inspection the thin rim was clearly irregular in surface brightness and slightly brighter along the SW and NE sides with a couple of tiny knots embedded in the rim. The slightly darker interior was weakly mottled or patchy with subtle variations in surface brightness.
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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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Achernar
Postmaster
Reged: 02/25/06
Posts: 5025
Loc: Mobile, Alabama, USA
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I have found some so-called 14th magnitude planetary nebulae such as NGC-6072 and NGC-6337 in Scorpius and NGC-6894 in Cygnus that turned out to be easy objects with an O-III filter from a reasonably dark area. Even the likes of Abell 21 and Jones 1, two very large and irregular planetary nebulae were much easier to see than I expected, albeit from a very dark area through a 10-inch Dobsonian. O-III filters really work well on faint emission and planetary nebulae, without a doubt.
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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EdK
member
Reged: 09/28/09
Posts: 10
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I know many like to throw magnitudes around like a football.
You don't here much about NGC 1501 as well as a number of other objects. I just wanted to see how much interest there was to this object. Get some input for this object and its magnitude. I love looking for the unusual and hard to find things in the sky . 11.6 mag is more reasonable for the seeing out here .
This time of the year I always look for NGC 6207 as a guide for my night viewing, if I see it conditions are good.
Yes I bypass M13....
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Achernar
Postmaster
Reged: 02/25/06
Posts: 5025
Loc: Mobile, Alabama, USA
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Possibly because NGC-1501 isn't the easiest object to star hop to. It's big and fairly faint, and if you have light pollution in your area, it's hard to see without nebula filters. Put an O-III in your eyepiece and it pops into view however. It's not as far as I know a particularly popular object, but neither is Cameleopardalis a popular hunting ground for deep sky objects, but it should be. There's several galaxies worth looking for, the nice open cluster NGC-1502 and that planetary nebula.
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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