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NGC 2274/2275 galaxy pair in Gemini

DSO Observing Report Sketching Visual
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#1 bphaneuf

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Posted 27 February 2024 - 09:33 PM

NGC 2274, 2275 – galaxy pair in Gemini:

 

A 40-minute window on 2/26 was the last chance to observe before clouds and rain set in for a couple weeks with a nighttime moon after that.   The club’s All Sky Meter showed passable transparency until a half hour before dark, at which time it dropped off, recovering just a little around 8pm, and then dropped again, corresponding to the clouds starting to thicken on the NW horizon.  Some high, thin clouds moved rapidly overhead early in the session and then cleared off.  Given such restrictions, it was hard to know what target to choose from the list as there would likely be only time for one observation.  The galaxy group in Gemini around NGC 2291 has been a priority but turned out not to be a good choice – too small and faint for poor transparency.  Never located them.  So, with about 15 minutes left until Luna’s entrance I switched to 2274/2275 which are brighter, and I had seen them when checking alignment accuracy.  2275’s arms are disrupted, but I couldn’t find out if that’s from 2274’s influence or some other encounter.  Also turns out this pair is associated with the 2291 group that I missed.  The pair sits at a distance of 234-238 million ly.

 

Observing:  Given the conditions, I was a bit surprised that this pair of v mag 13+ galaxies was so easily captured and held.  2274 was seen in direct vision almost from the start and 2275 was after some time.  I also looked for a couple outliers – UGC 3537 and 3544.  U3537 is listed at v mag. 15.3, but it’s a near face-on Sc spiral, and U3544 an edge on Sc but at v mag 16.4.  With poor transparency it wasn’t to be.   That being the case, the tighter FOV of the higher magnification made sense – 8mm/381x.

 

2274 , an elliptical and southernmost of the pair, was surprisingly bright.  A couple bright stars to the south form a nice line with it.  The full extent of the circular halo was best seen in AV although it and the core were easily held in direct vision.  Surprisingly large at that distance.  The circular core and nucleus were distinct and significantly brighter than the surrounding halo.  Not quite stellar in appearance.

 

2275 is not as bright as its companion, which is not surprising with it being a tilted spiral sitting 4 million ly further out than 2274.  It showed a 3:1 aspect. The core is bright and distinct, though not as much as 2274’s and could be held for long periods in direct vision.  The core is offset a little to the south of center and seemed elongated at times, and more concentrated at others.  AV is needed to pull in the far ends of the halo.  The northern half of the halo was distinctly broader than the southern half and tilted to the west.  That would correspond to the larger northern arm of the spiral.  Don’t know how Arp missed this one.

 

Sketching: white pastel pencils and white pastel powder on Canson 92 lb. black multimedia paper.    2274’s halo was drawn with a 1/8” round brush and 2274 with a #2 Filbert.  Both cores were placed with a 12/0 mini angular brush.

 

NGC 2274 & 2275 in GEM.jpg

 

Thanks for looking,

-b


Edited by bphaneuf, 27 February 2024 - 09:49 PM.

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#2 frank5817

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Posted 27 February 2024 - 09:40 PM

Butch,

 

Excellent sketch of this fine pair of galaxies in Gemini. They look very good.

 

Frank :)


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#3 niteskystargazer

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Posted 28 February 2024 - 11:29 AM

Butch,

 

Nice sketch of NGC 2274 /  NGC 2275 galaxy (Pair in Gemini) smile.gif ,

 

CDS,KLU,

 

thanx.gif ,

 

Tom


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#4 bphaneuf

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Posted 28 February 2024 - 11:37 AM

Thanks for the kind words Frank and Tom!



#5 Randolph Jay

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Posted 29 February 2024 - 01:21 PM

Excellent sketch work and oh my gosh what a 24" can pull in!!

I hadn't even known about this pair in Gemini!

Clear skies,

Randolph



#6 nof

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Posted 29 February 2024 - 01:29 PM

Great observation! A race against time

#7 bphaneuf

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Posted 29 February 2024 - 04:37 PM

Excellent sketch work and oh my gosh what a 24" can pull in!!

I hadn't even known about this pair in Gemini!

Clear skies,

Randolph

Thanks Randolph!  That pair isn't in the NSOG - I guess too dim for small to moderate sized scopes?  And yes, that 24" is a gem.  It still amazes me that I have access to such a light bucket for only the annual club fee!  It's a DIY by the gentleman for whom our observatory is named.
 

 

Great observation! A race against time

Thanks nof!  Luna was not waiting on me for sure. 
 

 



#8 mdowns

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Posted 29 February 2024 - 08:01 PM

Another fine post combining your observing skill,notes and drawing into a picture we all can understand.Thanks much for the reminder.I was certain that I had some notes on the pair(74/75) but found nothing.Next chance I get I'm going therelaugh.gif .


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#9 bphaneuf

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Posted 29 February 2024 - 08:21 PM

Thanks Michael!  The Equinox should do a fine job showing the asymmetry of 2275's arms.


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#10 Herodotus

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Posted 03 March 2024 - 08:43 PM

Really nice sketch B
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