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Observing >> Deep Sky Observing

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jgraham
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NGC1023 – Barred Spiral in Perseus
      #5534512 - 11/22/12 09:41 PM Attachment (61 downloads)

Galaxies are notoriously difficult to observe from my red-zone back yard so when I find one that’s easy to see it’s usually something pretty special. While using my LightBridge 16 to explore southwestern Perseus I was very surprised to find that NGC1023 was very easy to find and clearly showed an elliptical shape. Galaxies of this size usually show nearly stellar cores surrounded by faint, pearly haze. NGC1023 is variously described as either an elliptical galaxy or as a barred spiral, though the later seems to be the more modern and accepted description. What strikes me as interesting about this galaxy is that although its relatively high surface brightness makes in an easy visual object it shows so little detail photographically.

Telescope: Meade SC8 @ f/10, Orion Atlas EQ-G
Guider: Orion Deluxe Off-axis Guider, DSI Pro III, PHD
Camera: Canon Rebel T2i, Orion Imaging Sky Glow Filter
Exposure: 60x90sec, ISO 3200 saved as RAW
Darks: Internal
Flat: Synthetic
Software: Backyard EOS, Deep Sky Stacker, Photoshop


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jgraham
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Re: NGC1023 – Barred Spiral in Perseus new [Re: jgraham]
      #5534514 - 11/22/12 09:42 PM Attachment (42 downloads)

Annotated finder image for NGC1023.

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David Knisely
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Re: NGC1023 – Barred Spiral in Perseus new [Re: jgraham]
      #5534739 - 11/23/12 01:46 AM

Quote:

Galaxies are notoriously difficult to observe from my red-zone back yard so when I find one that’s easy to see it’s usually something pretty special. While using my LightBridge 16 to explore southwestern Perseus I was very surprised to find that NGC1023 was very easy to find and clearly showed an elliptical shape. Galaxies of this size usually show nearly stellar cores surrounded by faint, pearly haze. NGC1023 is variously described as either an elliptical galaxy or as a barred spiral, though the later seems to be the more modern and accepted description. What strikes me as interesting about this galaxy is that although its relatively high surface brightness makes in an easy visual object it shows so little detail photographically.

Telescope: Meade SC8 @ f/10, Orion Atlas EQ-G
Guider: Orion Deluxe Off-axis Guider, DSI Pro III, PHD
Camera: Canon Rebel T2i, Orion Imaging Sky Glow Filter
Exposure: 60x90sec, ISO 3200 saved as RAW
Darks: Internal
Flat: Synthetic
Software: Backyard EOS, Deep Sky Stacker, Photoshop




I haven't seen much detail visually in it (and it looks to be closer to an elliptical than a barred spiral, at least in appearance). The brighter oval core is fairly well defined and has a tiny star-like nucleus, but the outer haze is nearly featureless. The exception to this is the faint companion galaxy NGC 1023A which sits on the east-southeastern edge of the main galaxy. It is quite dim with a very low surface brightness, but I have caught glimpses of it in my 10 inch Newtonian, and in my 14 inch, it is visible with a great deal more certainty as a small but very diffuse oval puff of light, although it isn't bright by any means. Clear skies to you.


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Dave MitskyModerator
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Re: NGC1023 – Barred Spiral in Perseus new [Re: David Knisely]
      #5534746 - 11/23/12 01:53 AM

I've observed NGC 1023 quite a few times in the past several months through apertures ranging from 101 millimeters to 32 inches. The locations, with one exception, had better than sixth magnitude NELMs. Through my 101mm Tele Vue refractor at 79 and 108x, NGC 1023 appeared as a small and rather dim oval, with a somewhat brighter nucleus. The 32" Dob, however, portrayed its faint outer arms rather nicely.

Dave Mitsky


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IVM
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Dave Mitsky]
      #5535146 - 11/23/12 09:54 AM

NGC 1023 is a Herschel 400 object. I first observed it two years ago with my f/5.5 Televue 4". Here is what I recorded last Saturday, observing from Cherry Springs with my 16":

NGC 1003, 1023, and 1058 (correspondingly [William Herschel’s] II.238/III.198, I.156 and II.633) together with the famous NGC 891 in Andromeda belong to a nearby group. The three galaxies of the NGC 1023 group in Pegasus have distances between 28 and 38 Mly. NGC 1003 and 1023 are highly inclined. The former is SA(s)cd 6x2’, the latter SB(rs)0- 9x3’. In the DSS photo of NGC 1023 the intriguing features are a hint of equatorial dust dividing the core and a hook-like extension off the S side of the W end. This is a Magellanic companion and the pair is known as Arp 135. NGC 1058 is a face-on SA(rs)c 3-4’ in size. All three are on the small-to-modest side, from 31 (-58) to 85 (-23) kly. (The spectacular NGC 891, in addition to its advantageous type (Sb) and inclination, is 115 kly.)

[...]

NGC 1023 is impressive at 45x, with a tight core and tapered extensions, of which the W one appears brighter. ~3x1. [Aspect ratio – no minute sign.] At 225x, the nucleus is compact but far from stellar – more like a planetary disk. The companion, NGC 1023A, is invisible. The W end of the galaxy looks much brighter, which I cannot attribute to the pair of stars there against just one superimposed on the E extension, because all these stars are very faint and the galaxy is large. I see no corresponding asymmetry on the DSS, however. Also at 225x there is a suggestion of a sharper S edge and a more diffuse and extensive N edge near the core, which again has no counterpart in the DSS.


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Sarkikos
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Re: NGC1023 – Barred Spiral in Perseus new [Re: IVM]
      #5535446 - 11/23/12 12:56 PM

I've seen 1023, 1003 and 1058 through my 10" Dob at a yellow zone site.

Mike


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David Knisely
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Dave Mitsky]
      #5535596 - 11/23/12 02:11 PM

Quote:

I've observed NGC 1023 quite a few times in the past several months through apertures ranging from 101 millimeters to 32 inches. The locations, with one exception, had better than sixth magnitude NELMs. Through my 101mm Tele Vue refractor at 79 and 108x, NGC 1023 appeared as a small and rather dim oval, with a somewhat brighter nucleus. The 32" Dob, however, portrayed its faint outer arms rather nicely.

Dave Mitsky




Well, NGC 1023 is classed as an SB0 meaning it has no distinct spiral structure, and that is backed up by deep images of the galaxy. The outer haze is featureless even in long exposure images, and the core region is the only area with a little detail, mostly in the form of slight very diffuse brightenings northwest of and southeast of the nucleus (presumably evidence of a weak central bar). I haven't seen much detail in the outer portions of that galaxy even in some rather large telescopes. The companion galaxy NGC 1023a may make it look like a segment of a spiral arm is at that location, but again, that feature is a separate object. Deep color images clearly show that the companion is more bluish than the area of NGC 1023 that the companion sits up against. I may have to look around for a while to find Rick Johnson's fine image of NGC 1023 that shows the slight bluish nature of the companion, but I'm afraid that the galaxy itself has no well-defined outer spiral arm structure. Clear skies to you.


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Dave MitskyModerator
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Re: NGC1023 – Barred Spiral in Perseus new [Re: David Knisely]
      #5535767 - 11/23/12 03:48 PM

Pardon me, I shouldn't have used the term spiral arms but there was far more extension visible through the 32" than I have ever seen previously and that's what I meant to convey.

Dave Mitsky


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Feidb
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Dave Mitsky]
      #5536287 - 11/23/12 09:21 PM

Last time I saw it was back in 2006 with my home-made 16-inch f/6.4 at 70X. It had a bright core and the halo extended each direction from the core quite a ways. I didn't see any bar, of course. That observation was from Redstone Picnic Area on the north shore of Lake Mead, Nevada. I haven't seen it since. Sounds like it's about time for another look.

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Dave MitskyModerator
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Feidb]
      #5536311 - 11/23/12 09:34 PM

Halo is the very word I should have used.

Dave Mitsky


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David Knisely
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Re: NGC1023 – Barred Spiral in Perseus new [Re: David Knisely]
      #5536560 - 11/24/12 01:31 AM Attachment (27 downloads)

OK, here is a cropped version of the image of NGC 1023 and its companion NGC 1023a (along the lower left edge of the galaxy) by Minnesota astrophotographer Rick Johnson (north is at the top). Also visible is the 17th magnitude galaxy PGC 10169 just below the bright star off the left edge of NGC 1023:

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IVM
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Re: NGC1023 – Barred Spiral in Perseus new [Re: David Knisely]
      #5537012 - 11/24/12 10:53 AM

Wow, how "Magellanic" indeed it is in color.

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uniondrone
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Re: NGC1023 – Barred Spiral in Perseus new [Re: IVM]
      #5537493 - 11/24/12 04:35 PM


I've seen NGC 1023 in my 10" from my white zone backyard. It is one of the easiest galaxies to see from heavy light pollution. It seems to cut through skyglow with remarkable ease.


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Scanning4Comets
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Re: NGC1023 – Barred Spiral in Perseus new [Re: uniondrone]
      #5539262 - 11/25/12 07:03 PM

I remember first seeing it in a 12.5" reflector I used to own from my backyard. I was shocked at how bright it was through my light polluted skies also!

I have since seen it about 4-5 more times and always go back to enjoy it some more! It takes higher powers well.

Cheers,


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Astrodj
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Scanning4Comets]
      #5539637 - 11/25/12 11:35 PM

I can just make out Ngc 1023A in the OP photo. Cool.

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sgottlieb
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Astrodj]
      #5539773 - 11/26/12 03:01 AM

Here's a LARGE aperture view of NGC 1023 and its overlapping companion from last October ---

48" (10/25/11): this gorgeous galaxy appeared extremely bright, very elongated 4:1 E-W, ~7'x1.8', with a large, brighter central core that increases to an intensely bright inner core punctuated by a bright stellar nucleus. The outer halo gradually fades at the ends of the extensions. Several stars are superimposed on both sides of the core.

NGC 1023A, a low surface brightness dwarf companion, is superimposed on the east side (2.4' ESE of center). It appeared as a faint, fairly large, low surface brightness patch oriented SSW-NNE, roughly 1.2'x0.8', and it blends into the main galaxy. Although most of the companion is within the halo of NGC 1023, part of it juts out the southeast edge of the galaxy. The halo of NGC 1023 extends beyond (east) of the dwarf.


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Starman1
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Re: NGC1023 – Barred Spiral in Perseus new [Re: sgottlieb]
      #5548987 - 12/01/12 03:36 PM

My last observation of this was with a 5" Mak (it's in my list of the 500 Best DSOs), but here are my notes from 1995, using an 8" SCT:
"mod.sz, rel.faint, M31-looking, brite core, oval w/blunt ends, superimposed stars, elongated core has diff. long axis than main body of galaxy"

My notes from the 12.5" differ a little--primarily in saying the galaxy is large, brite, with an even brighter core and stellar nucleus. I still note the core's long axis is not at the same position angle as the long body of the entire galaxy.

This galaxy has been given the common name of "Perseus Lenticular" To my eye, it is a little fat at the ends to be considered visually lenticular.

Nice for all apertures.


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JohnMurphyRN
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Re: NGC1023 – Barred Spiral in Perseus new [Re: David Knisely]
      #5549001 - 12/01/12 03:46 PM

Quote:

OK, here is a cropped version of the image of NGC 1023 and its companion NGC 1023a (along the lower left edge of the galaxy) by Minnesota astrophotographer Rick Johnson (north is at the top). Also visible is the 17th magnitude galaxy PGC 10169 just below the bright star off the left edge of NGC 1023:




David's picture is interesting in that several other little galaxies are included, one at 12:00 and one off to the left and level with that one. Interesting to go picking through the detail..Thanks!


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Starman1
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Re: NGC1023 – Barred Spiral in Perseus new [Re: JohnMurphyRN]
      #5549025 - 12/01/12 04:05 PM

Quote:

Quote:

OK, here is a cropped version of the image of NGC 1023 and its companion NGC 1023a (along the lower left edge of the galaxy) by Minnesota astrophotographer Rick Johnson (north is at the top). Also visible is the 17th magnitude galaxy PGC 10169 just below the bright star off the left edge of NGC 1023:




David's picture is interesting in that several other little galaxies are included, one at 12:00 and one off to the left and level with that one. Interesting to go picking through the detail..Thanks!



One on left og NGC1023, next to star, is PGC10169
One directly below N1023, near bottom of pic, is MAC 0240 + 3856
One directly above N1023, near pair of stars, is MAC 0240 +3909
One in lower right, near trio of stars, and immediately adjacent to a faint star, is MAC 0239 +3856
One in upper left, level with MAC 0240 +3909 and almost directly above PGC10169 is anonymous.
To put things in perspective, the little galaxies have total integrated magnitudes of 17.0-17.3. The one in the upper left may be 18.0 or fainter. The MAC galaxies are visible with a 36" aperture (Larry Mitchell's instrument of choice for the MAC).


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IVM
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Re: NGC1023 – Barred Spiral in Perseus new [Re: Starman1]
      #5549144 - 12/01/12 05:42 PM

Below I added some catalog designations to Don's list, after a slash on each line. At least in this area of the sky (next to one of the most-observed objects) MAC is deeper than even the extended (7-digit) PGC.

One on left og NGC1023, next to star, is PGC10169 / NGC 1023B
One directly below N1023, near bottom of pic, is MAC 0240 + 3856 / PGC 2140229
One directly above N1023, near pair of stars, is MAC 0240 +3909
One in lower right, near trio of stars, and immediately adjacent to a faint star, is MAC 0239 +3856 / PGC 2140117
One in upper left, level with MAC 0240 +3909 and almost directly above PGC10169 is anonymous.


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