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NGC 4151

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#1 Dan Crowson

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Posted 21 January 2021 - 08:28 PM

NGC 4151 (UGC 7166, PGC 38739 and at least 50 other designations according to SIMBAD) is a Seyfert 1 (https://en.wikipedia...eyfert_galaxies) galaxy with a bright core and faint arms. While papers show varying distance estimates, the newest is approximately 60 million light-years away in Canes Venatici.

NGC 4156 (UGC 7173, PGC 38773 and others) is the delicate face-on spiral above and to the left (east) of NGC 4151. Estimates put this one at approximately 321 million light-years away.

UGC 7188 (PGC 38811 and others) is the odd spiral to the left of NGC 4151.

Luminance – 29x600s – 290 minutes – binned 1x1
RGB – 12:8:12x300s – 60:40:60 minutes each – binned 2x2

450 minutes total exposure – 7 hours 30 minutes

Imaged January 11th, 12th and 15th, 2021 and January 1st, 2021 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.

LRGB - https://www.flickr.c...691488/sizes/l/

 

See the link above because the attached image has been down-sampled.

 

NGC%204151%20-%20CN%20-%20LRGB.jpg

 

Dan
 


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#2 zakry3323

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Posted 21 January 2021 - 09:16 PM

Very impressive Dan- an incredible image. Thanks very much for sharing. 



#3 randcpoll

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Posted 21 January 2021 - 09:37 PM

Very well done! I really like the way you've pulled out the extended arms so that they are faint, but clearly visible . 



#4 Ron (Lubbock)

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Posted 21 January 2021 - 09:46 PM

I love seeing these less-often imaged galaxies.  12" of aperture + truly dark skies,  and you've got one really deep image there.  I wish I still lived close enough to NM to drive there with my gear.



#5 PeteM

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Posted 21 January 2021 - 09:47 PM

Excellent work as usual Dan! Always enjoy the mini facts about the interesting objects in the field.



#6 spyderbench

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Posted 21 January 2021 - 09:48 PM

Wow, great imaging job! ....Can't swing a deceased cat in there without hitting a galaxy!



#7 Benschop

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Posted 21 January 2021 - 10:15 PM

That's a great image. The outer arms of 4151 sure are faint.

2432mm - impressive guiding for that F/Length



#8 starblue

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Posted 22 January 2021 - 03:09 AM

Curious--according to SkySafari 6 NGC 4151 is 13 million ly distant with a diameter of 10,600 ly. Meanwhile, the numbers for 4156 match yours. That's quite a revision from 13Mly to 60Mly.



#9 MikiSJ

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Posted 22 January 2021 - 03:17 AM

This one of those "can't see the galaxy for the galaxy cluster". Nice job of collecting a whole lot of photons and then assembling them into a nice image - WOW!



#10 Strongmanmike

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Posted 22 January 2021 - 05:04 AM

That's a beauty Dan waytogo.gif

 

Mike



#11 Dan Crowson

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Posted 22 January 2021 - 10:45 AM

I love seeing these less-often imaged galaxies.  12" of aperture + truly dark skies,  and you've got one really deep image there.  I wish I still lived close enough to NM to drive there with my gear.


Thanks Ron. I actually just did this (I'm 1,300 miles away). I brought my portable refractor and had seven clear nights so I'll be posting low (I can go down to about 15 degrees) southern images soon.
 
Dan



#12 Dan Crowson

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Posted 22 January 2021 - 10:48 AM

Curious--according to SkySafari 6 NGC 4151 is 13 million ly distant with a diameter of 10,600 ly. Meanwhile, the numbers for 4156 match yours. That's quite a revision from 13Mly to 60Mly.

Yes. When I looked into this one, there were vastly different distances in Simbad. The 'close' one was older via 'T-F.' I tend to pick the newest.

 

| distance Q unit|  err-        err+     | method |     reference     |
-----------------------------------------------------------------------
|   18.5     Mpc |                       |redshift|2011MNRAS.413..813C|
|   14.00    Mpc |                       |redshift|2010ApJ...725.2270P|
|    3.9     Mpc |  -0.7        +0.6     |T-F     |2008ApJ...676..184T|
|   20.3     Mpc |                       |        |2007ApJ...659.1176M|
|   15.19    Mpc |                       |redshift|2007ApJ...655..790C|

 

http://simbad.u-stra...ements#lab_meas

 

Dan


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