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NGC 5945: Barred "Ring" Spiral in Bootes

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#1 Keith Rivich

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Posted 29 April 2023 - 02:45 PM

Hereafter known as Kim's Object. 

 

Just kidding. I'm sitting at my table printing charts when my wife walked by, looked at the computer screen, and asked what that was. I was on NGC 4222 at the time. She blurted out "5945", add that to your list". For reference my wife has a passing interest in astronomy: she Passes by me and loses Interest

 

So I decided what the hey and entered "n5945" in Megastar. Here is what I got:

ngc5945_chart.jpg

 

Ok. A bunch of blue ovals. But here is the same field with RealSky turned on:

ngc5945_realsky.jpg

 

Whole different ballgame! We now have a very interesting galaxy to hunt down.

 

From Steve Gottlieb's site:

Édouard Stephan discovered NGC 5945 = St. 11-35, along with NGC 5943, on 6 Jun 1877.  A second observation was made on 5 Jun 1878.  His published position was reduced on 12 Jun 1880 and matches UGC 9871.  His first observation may have been on 4 Jun 1869, but his rough position was off by 9', so the identification isn't certain.

 

You may recognize the name as Mr. Stephan is probably most famous, at least in the amateur community, for discovering Stephan's Quintet. Presumably Stephan discovered N5945 using the Marseille Observatory 80cm (32") Foucalt built reflector. Stephan was director from 1864 to 1907. As a side note the 80cm reflector was the first to feature a glass base coated with a thin reflective metal. 

 

foucault-ancien.jpg

 

From Gottlieb:

24" (7/28/16): at 260x; moderately bright and large, round, 1' diameter.  Sharply concentrated with a very bright, very small nucleus.  A faint bar extends ~N-S from the nucleus.  A mag 14.5 star is superimposed on the NNE end and a fainter mag 15-15.5 is on the west side [20" from center].  In a group with NGC 5943 8.5' S, NGC 5934/5935 17' W and NGC 5947 15' SE.

 

I'll add this one to my TSP list!

 

NGC 5945

RA     15 29 45

DEC   42 55 07

MAG ~13

SIZE   3'x2'


Edited by Keith Rivich, 29 April 2023 - 03:05 PM.

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#2 Akarsh Simha

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Posted 29 April 2023 - 03:30 PM

Wow! That's a very cool galaxy, and an interesting story on how it came up on your observing list. I just added it to mine.


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#3 BrentKnight

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Posted 29 April 2023 - 03:42 PM

Hey Keith...

 

I just added this one to my list for the Cloudy Nights EAA May Challenge.  Thanks!


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#4 RLK1

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Posted 29 April 2023 - 04:15 PM

Added to my list for an observation with my 16" when we get past the current moon phases...

https://in-the-sky.o....php?id=NGC5945

and:

https://kosmoved.ru/...C-5945&lang=eng



#5 12BH7

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Posted 29 April 2023 - 04:28 PM

Nice target. I looked at my log and it's not even listed in my Star Atlas 2000. At mag 14.1 I'll give it a try the next time I'm at a dark site when it's up.

 

Thanks



#6 KidOrion

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Posted 29 April 2023 - 10:17 PM

Hereafter known as Kim's Object. 

 

Just kidding. I'm sitting at my table printing charts when my wife walked by, looked at the computer screen, and asked what that was. I was on NGC 4222 at the time. She blurted out "5945", add that to your list". For reference my wife has a passing interest in astronomy: she Passes by me and loses Interest

 

So I decided what the hey and entered "n5945" in Megastar. Here is what I got:

attachicon.gifngc5945_chart.jpg

 

Ok. A bunch of blue ovals. But here is the same field with RealSky turned on:

attachicon.gifngc5945_realsky.jpg

 

Whole different ballgame! We now have a very interesting galaxy to hunt down.

 

From Steve Gottlieb's site:

Édouard Stephan discovered NGC 5945 = St. 11-35, along with NGC 5943, on 6 Jun 1877.  A second observation was made on 5 Jun 1878.  His published position was reduced on 12 Jun 1880 and matches UGC 9871.  His first observation may have been on 4 Jun 1869, but his rough position was off by 9', so the identification isn't certain.

 

You may recognize the name as Mr. Stephan is probably most famous, at least in the amateur community, for discovering Stephan's Quintet. Presumably Stephan discovered N5945 using the Marseille Observatory 80cm (32") Foucalt built reflector. Stephan was director from 1864 to 1907. As a side note the 80cm reflector was the first to feature a glass base coated with a thin reflective metal. 

 

attachicon.giffoucault-ancien.jpg

 

From Gottlieb:

24" (7/28/16): at 260x; moderately bright and large, round, 1' diameter.  Sharply concentrated with a very bright, very small nucleus.  A faint bar extends ~N-S from the nucleus.  A mag 14.5 star is superimposed on the NNE end and a fainter mag 15-15.5 is on the west side [20" from center].  In a group with NGC 5943 8.5' S, NGC 5934/5935 17' W and NGC 5947 15' SE.

 

I'll add this one to my TSP list!

 

NGC 5945

RA     15 29 45

DEC   42 55 07

MAG ~13

SIZE   3'x2'

But you haven't answered the question: how did your wife know that NGC 5945 was a suitable target?



#7 Keith Rivich

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Posted 29 April 2023 - 10:33 PM

But you haven't answered the question: how did your wife know that NGC 5945 was a suitable target?

Darned good question! 

 

I haven't a clue. She just let loose with the number and walked away. Random I hope. If not I have a secret astronomer on my hands! 


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#8 BrentKnight

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Posted 07 May 2023 - 05:46 PM

Here is a link to the EAA Challenge for May where I included NGC5945 (Kim's Object).  When Luna moves out of the nighttime sky, I think we will be able to get some really nice captures.



#9 bphaneuf

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Posted 07 May 2023 - 06:23 PM

I'm  in.  We'll see if the 24" and my abilities are up to it.  Would be nice to have really transparent and steady skies for good magnification as detail will be tough visually at that distance and magnitude.  This part of the country is notoriously humid this time of year. 

-b



#10 12BH7

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Posted 08 May 2023 - 09:57 AM

I checked my log and I don't have it. I' WAS planning a dark site night with my 12" SCT early next week. But the weather forecast isn't looking good.



#11 Keith Rivich

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Posted 27 May 2023 - 07:06 PM

Here is my report I posted in TSP Observing Report:

 

NGC 5945.  This was "Kim's Object" in another post. Very nice at 700x. The bright core and the bar were readily visible. The arms were delicate but visible with the area between the core and the arms noticeably darker. a pair of 15th mag stars occupies each hollow area. The DSS image shows an outer halo which we could not see.

 

I had looked at this galaxy earlier in the week in less the ideal conditions. We finally caught a break on Wednesday night and I was able to get a good look at the 5945.


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#12 luxo II

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Posted 28 May 2023 - 11:57 PM

An interesting target for imaging too https://www.astrobin.../full/2jjf3g/0/


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