'Double Star' Galaxies, Anyone?

[Scott Harrington]

Last evening I observed a fun galaxy pair in Triangulum. Originally discovered as one object (NGC 750) by William Herschel, it shows itself to be double at 94x in my 10-inch SCT upon intently focusing on it. In fact, I could see that the northernmost member was larger and brighter of the "touching" galaxies. At 260x they were a wide pair of diffuse elliptical galaxies.

Another cute pair I recently viewed is NGC 1128 in northeast Cetus. I learned of it last month when I read Steve Gottlieb's 5-year-old but extremely enjoyable OotW for the first time. On Jan 1 I looked at this pair with my 16-inch and at 68x I was surprised to see these two elliptical galaxies as a highly elongated smudge aligned north-south next to a brighter pair of stars on their west side also aligned north-south. Bumping up to 300x, I could see that the northernmost member had a brighter core while the southernmost member was almost larger with a less intense core. Instead of lingering to look for other members of the Abell 400 galaxy cluster, I moved on to a planetary in Taurus.

Does anybody else know of such close galaxy pairs of near equal size, brightness, and even alignment? It spooked me a bit to see these two acting like double stars in my telescopes.

Scott H.

NGC 1128 in Cetus

NGC 750/51 in Triangulum

[Akarsh Simha]

I know of one other example, that I did a OOTW on many years ago:

https://www.deepskyforum.com/showthread.php?1027-Object-of-the-Week-June-11th-2017-The-elliptical-dumbbell-NGC-4782-3-%28VV-201%29

I don't know if the interacting pair in the Hercules cluster, Arp 172, qualifies your list. Legacy survey image seems to suggest one of the two at least is a disk galaxy.

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[Akarsh Simha]

What about NGC 1525? Legacy clearly shows spirals, but it looks like a "double star galaxy" in our modest telescopes.

[Mark Wagner]

I'd expect one could go through Miles Paul's trios to find some 

[Scott Harrington]

Well, I have to say that Akarsh knew exactly what I was after since his very first OotW was on such a pairing! I looked at images of NGC 4782 and while both galaxies seem to be brighter than those in NGC 750 or NGC 1128, they also might be closer. A challenge I'll gladly accept with my 10-inch in the coming months.

As for NGC 1525, that designation doesn't work in SIMBAD. Going to Steve Gottlieb's notes, he writes that NGC 1524/25 is a duplicate entry for NGC 1516. So, even though both galaxies look to be barred spirals, I suspect that in the eyepiece they may still have the same look as a pair of ellipticals. Plus, their spacing and orientation look great. So, it's also on the list for an upcoming evening!

Well done, Akarsh. As for Mark's suggestion, I like it, but it will have to wait as I've got too many ongoing writing projects to be able to go there this minute.

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/CA%2B9k5tyq%3D%2BC8hN65%3Dx6rB3ChAUuc2RF8j8NiCB6afMdFqzWPCQ%40mail.gmail.com.

[Akarsh Simha]

Ah okay; so you are admitting spiral interactions or lenticular interactions that would appear as a double galactic blob in our telescopes. Then add Segner’s Wheel to your list. I’m remembering one other Arp that fits your bill but I can’t place where it is and what the number is.

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/CAGmLLxsefkeUHrXRg%3D3u07A6V%3DN2CYqFd%2BxSEKCDwHX5NS8UMg%40mail.gmail.com.

[Wouter van Reeven]

Do you mean Arp 85? Just kidding, that's M 51 haha

— 
Lime and limpid green a second scene,
A fight between the blue you once knew.
Floating down the sound resounds
Around the icy waters underground
[Pink Floyd - Astronomy Domine]

On 18-01-2025, at 20:22, Akarsh Simha <akars...@gmail.com> wrote:



Ah okay; so you are admitting spiral interactions or lenticular interactions that would appear as a double galactic blob in our telescopes. Then add Segner’s Wheel to your list. I’m remembering one other Arp that fits your bill but I can’t place where it is and what the number is.

On Sun, Jan 19, 2025 at 00:47 Scott Harrington <sn4...@gmail.com> wrote:

Well, I have to say that Akarsh knew exactly what I was after since his very first OotW was on such a pairing! I looked at images of NGC 4782 and while both galaxies seem to be brighter than those in NGC 750 or NGC 1128, they also might be closer. A challenge I'll gladly accept with my 10-inch in the coming months.

As for NGC 1525, that designation doesn't work in SIMBAD. Going to Steve Gottlieb's notes, he writes that NGC 1524/25 is a duplicate entry for NGC 1516. So, even though both galaxies look to be barred spirals, I suspect that in the eyepiece they may still have the same look as a pair of ellipticals. Plus, their spacing and orientation look great. So, it's also on the list for an upcoming evening!

Well done, Akarsh. As for Mark's suggestion, I like it, but it will have to wait as I've got too many ongoing writing projects to be able to go there this minute.

On Fri, Jan 17, 2025 at 11:58 AM Akarsh Simha <akars...@gmail.com> wrote:

I know of one other example, that I did a OOTW on many years ago:

https://www.deepskyforum.com/showthread.php?1027-Object-of-the-Week-June-11th-2017-The-elliptical-dumbbell-NGC-4782-3-%28VV-201%29

I don't know if the interacting pair in the Hercules cluster, Arp 172, qualifies your list. Legacy survey image seems to suggest one of the two at least is a disk galaxy.

On Fri, Jan 17, 2025 at 7:44 AM Scott Harrington <sn4...@gmail.com> wrote:

Last evening I observed a fun galaxy pair in Triangulum. Originally discovered as one object (NGC 750) by William Herschel, it shows itself to be double at 94x in my 10-inch SCT upon intently focusing on it. In fact, I could see that the northernmost member was larger and brighter of the "touching" galaxies. At 260x they were a wide pair of diffuse elliptical galaxies.

Another cute pair I recently viewed is NGC 1128 in northeast Cetus. I learned of it last month when I read Steve Gottlieb's 5-year-old but extremely enjoyable OotW for the first time. On Jan 1 I looked at this pair with my 16-inch and at 68x I was surprised to see these two elliptical galaxies as a highly elongated smudge aligned north-south next to a brighter pair of stars on their west side also aligned north-south. Bumping up to 300x, I could see that the northernmost member had a brighter core while the southernmost member was almost larger with a less intense core. Instead of lingering to look for other members of the Abell 400 galaxy cluster, I moved on to a planetary in Taurus.

Does anybody else know of such close galaxy pairs of near equal size, brightness, and even alignment? It spooked me a bit to see these two acting like double stars in my telescopes.

Scott H.

NGC 1128 in Cetus

<Screenshot 2025-01-17 9.29.08 AM.png>

NGC 750/51 in Triangulum

<24c1deff-ca5b-44f7-b364-865a6c0322a1.png>

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[Scott Harrington]

Well, beggars can't be choosers!. So, I'll take what I can get at the moment. Heck, normally I dislike elliptical galaxies, but this project seems to have given me a reason to at least pay a few of them a visit. UGC 9425 = Segner's Wheel in Boötes. Looks interesting. It's now on the list.

Scott H.

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[Akarsh Simha]

Okay I had a quick look at the Arp DSS2 images (https://asimha.net/Arp_Montage.pdf) and found a few:

Arp 169

Arp 172

Arp 241

Arp 249

Arp 237

I think the Arp I was thinking of was Arp 172, which I already mentioned. Segner’s Wheel is Arp 241. Presumably the rest are additions. Of course all of these feature some faint tidal streams that are not going to be easily visible in most amateur telescopes.

And Wouter, Arp 85 must be the Albireo of double star galaxies for a 6x35 binocular!

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/B72C73DB-4BE4-4A73-B703-321DD2C623E9%40van.reeven.nl.

[Scott Harrington]

Thanks for the help, Akarsh.

Arp 169 (bright, but not interested since it's too wide)

Arp 172 (wide pair of slightly squashed-looking galaxies, but worth a look)

Arp 241 (looking forward to seeing it in my 16-inch)

Arp 249 (fits many of my criteria, so will take a look with 16-inch)

Arp 237 (will take a peek at it, but worried that the eastern member won't show up well next to UGC 5044)

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/CA%2B9k5txC-5w3t8QgKqnPVGr47%3DkAiTqj%3DQBHCGHd8gOZNGExeA%40mail.gmail.com.

[Steve Gottlieb]

I’ve been ‘marking’ double galaxies such as these for a long time with the expectation of writing an article for Sky & Tel on the theme (with some corny title like “These dumbbell galaxies will give you a workout”. Anyways, this is a really a partial list, as I haven’t consistently tagged those I’ve observed. Also, I’m sure several are spirals in which the core region is mainly seen (at least in a 18” or smaller scope.) I believe the separations between centers are ~30” or less, though probably a few in the list are more. I’m not sure of the closest such pair I’ve seen (probably viewed in Jimi’s 48”), but one candidate is likely NGC 4898 at a separation of ~8”. I’ve managed this pair with my former 18” and of course, it was simple in McDonald Observatory’s 82”.

NGC 4898 is in the Coma cluster and in the center of many galaxy clusters you’ll find a number of close/merging pair, triplets, etc that would qualify on this list. How about Zwicky's Nonet in AGC 407?

NGC 61
NGC 78
NGC 190
NGC 235
NGC 317
IC 1623
NGC 414
NGC 526
NGC 750/751
IC 186
NGC 942/943
NGC 978
NGC 1044
UGC 2369
NGC 1516
NGC 1592
UGC 4052
UGC 4699
UGC 5044
IC 590
NGC 3405
UGC 6175
IC 720
NGC 3926
NGC 4211
NGC 4410
NGC 4547
NGC 4782/4783
NGC 4759 (4776/4778)
NGC 4841
NGC 4893
NGC 4898
NGC 4933
NGC 5278/79
UGC 9425
NGC 5765
NGC 5860
IC 1165
IC 1178/81
NGC 6080
NGC 6098/99
IC 1259
UGC 11672
NGC 7018
NGC 7236/7237
NGC 7578
NGC 7774
IC 5364

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[Victor van Wulfen]

Hi all,

First post on this group, I hope it gets through.

I wondered which of these were catalogued as a pair. Turns out only 4 of them are not. Here's the complete list:

NGC 61 - VV' 742
NGC 78 - VV' 878 / KPG 6
NGC 190 - Part of Hickson 5
NGC 235
NGC 317 - VV' 928 / KPG 19
IC 1623 - Arp 236
NGC 414 - VV' 938 / KPG 25
NGC 526 - VV' 959
NGC 750/751 - VV' 189 / KPG 46 (part of Arp 166)
IC 186 - VV' 997
NGC 942/943 - Holmberg 59 / VV' 217 / Arp 309
NGC 978 - VV' 1035 / KPG 71
NGC 1044 - with PGC3080165 - part of VV' 1042
UGC 2369 - VV' 1054 / KPG 82
NGC 1516
NGC 1592 - VV' 647
UGC 4052 - KPG 145
UGC 4699 - KPG 180
UGC 5044 - Holmberg 131A / Arp 204 / KPG 204 (part of Holmberg 131 / VV' 1286 / Hickson 38
IC 590 - VV' 1336 / KPG 223
NGC 3405 - KPG 250
UGC 6175 - VV' 239 / Arp 91 / KPG 268
IC 720 - VV' 1467 / KPG 298
NGC 3926 - VV' 218 / KPG 305
NGC 4211 - VV' 199 / Arp 106 / KPG 327
NGC 4410 - KPG 335 (part of VV' 1537)
NGC 4547
NGC 4782/4783 - Holmberg 485 / VV' 201
NGC 4759 (4776/4778) - Holmberg 477A (part of Holmberg 477, part of Hickson 62)
NGC 4841 - Holmberg 492 / VV' 1582 / KPG 361
NGC 4893 - Holmberg 498 / VV' 222
NGC 4898
NGC 4933 - Holmberg 502 (part of VV' 1587 / Arp 176)
NGC 5278/79 - VV' 19 / Arp 239 / KPG 390
UGC 9425 - Arp 241
NGC 5765 - VV' 1718 / KPG 437
NGC 5860 - VV' 1739 / KPG 454
IC 1165 - VV' 90
IC 1178/81 - VV' 194 / Arp 172
NGC 6080 - KPG 487
NGC 6098/99 - VV' 192 / KPG 493
IC 1259 - VV' 101 / Arp 310 / KPG 517
UGC 11672 - Holmberg 784 / VV' 102
NGC 7018 - VV' 764
NGC 7236/7237 - KPG 564 (parto of VV' 1934 / Arp 169)
NGC 7578 - Arp 170 (part of Hickson 94)
NGC 7774 - Holmberg 821 / VV' 2004 / KPG 594
IC 5364 - VV' 2008

Cheers,


Victor


Victor van Wulfen
clearskies.eu <https://clearskies.eu/>

> On Jan 18, 2025, at 11:43 AM, Akarsh Simha <akars...@gmail.com <mailto:akars...@gmail.com>> wrote:
>
> Okay I had a quick look at the Arp DSS2 images (https://asimha.net/Arp_Montage.pdf <https://asimha.net/Arp_Montage.pdf>) and found a few:

>
> Arp 169
> Arp 172
> Arp 241
> Arp 249
> Arp 237
>
> I think the Arp I was thinking of was Arp 172, which I already mentioned. Segner’s Wheel is Arp 241. Presumably the rest are additions. Of course all of these feature some faint tidal streams that are not going to be easily visible in most amateur telescopes.
>
> And Wouter, Arp 85 must be the Albireo of double star galaxies for a 6x35 binocular!
>

> On Sun, Jan 19, 2025 at 00:58 Wouter van Reeven <wou...@van.reeven.nl <mailto:wou...@van.reeven.nl>> wrote:
> Do you mean Arp 85? Just kidding, that's M 51 haha
> —
> Lime and limpid green a second scene,
> A fight between the blue you once knew.
> Floating down the sound resounds
> Around the icy waters underground
> [Pink Floyd - Astronomy Domine]
>

>> On 18-01-2025, at 20:22, Akarsh Simha <akars...@gmail.com <mailto:akars...@gmail.com>> wrote:
>>
>> 
>> Ah okay; so you are admitting spiral interactions or lenticular interactions that would appear as a double galactic blob in our telescopes. Then add Segner’s Wheel to your list. I’m remembering one other Arp that fits your bill but I can’t place where it is and what the number is.
>>

>> On Sun, Jan 19, 2025 at 00:47 Scott Harrington <sn4...@gmail.com <mailto:sn4...@gmail.com>> wrote:
>> Well, I have to say that Akarsh knew exactly what I was after since his very first OotW was on such a pairing! I looked at images of NGC 4782 and while both galaxies seem to be brighter than those in NGC 750 or NGC 1128, they also might be closer. A challenge I'll gladly accept with my 10-inch in the coming months.
>>
>> As for NGC 1525, that designation doesn't work in SIMBAD. Going to Steve Gottlieb's notes, he writes that NGC 1524/25 is a duplicate entry for NGC 1516. So, even though both galaxies look to be barred spirals, I suspect that in the eyepiece they may still have the same look as a pair of ellipticals. Plus, their spacing and orientation look great. So, it's also on the list for an upcoming evening!
>>
>> Well done, Akarsh. As for Mark's suggestion, I like it, but it will have to wait as I've got too many ongoing writing projects to be able to go there this minute.
>>

>> On Fri, Jan 17, 2025 at 11:58 AM Akarsh Simha <akars...@gmail.com <mailto:akars...@gmail.com>> wrote:
>> I know of one other example, that I did a OOTW on many years ago:

>> https://www.deepskyforum.com/showthread.php?1027-Object-of-the-Week-June-11th-2017-The-elliptical-dumbbell-NGC-4782-3-%28VV-201%29 <https://www.deepskyforum.com/showthread.php?1027-Object-of-the-Week-June-11th-2017-The-elliptical-dumbbell-NGC-4782-3-%28VV-201%29>

>>
>> I don't know if the interacting pair in the Hercules cluster, Arp 172, qualifies your list. Legacy survey image seems to suggest one of the two at least is a disk galaxy.
>>
>>
>> On Fri, Jan 17, 2025 at 7:44 AM Scott Harrington <sn4...@gmail.com <mailto:sn4...@gmail.com>> wrote:
>> Last evening I observed a fun galaxy pair in Triangulum. Originally discovered as one object (NGC 750) by William Herschel, it shows itself to be double at 94x in my 10-inch SCT upon intently focusing on it. In fact, I could see that the northernmost member was larger and brighter of the "touching" galaxies. At 260x they were a wide pair of diffuse elliptical galaxies.
>>
>> Another cute pair I recently viewed is NGC 1128 in northeast Cetus. I learned of it last month when I read Steve Gottlieb's 5-year-old but extremely enjoyable OotW for the first time. On Jan 1 I looked at this pair with my 16-inch and at 68x I was surprised to see these two elliptical galaxies as a highly elongated smudge aligned north-south next to a brighter pair of stars on their west side also aligned north-south. Bumping up to 300x, I could see that the northernmost member had a brighter core while the southernmost member was almost larger with a less intense core. Instead of lingering to look for other members of the Abell 400 galaxy cluster, I moved on to a planetary in Taurus.
>>
>> Does anybody else know of such close galaxy pairs of near equal size, brightness, and even alignment? It spooked me a bit to see these two acting like double stars in my telescopes.
>>
>> Scott H.
>>
>> NGC 1128 in Cetus
>> <Screenshot 2025-01-17 9.29.08 AM.png>
>>
>> NGC 750/51 in Triangulum
>> <24c1deff-ca5b-44f7-b364-865a6c0322a1.png>
>>
>>
>>
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[Steve Gottlieb]

With a little bit of checking, NGC 414 may be a bit tighter at ~7” (resolved a few years back in my 24”) and I may find some closer nuclei. Aperture is the key to getting much tighter than this.

[Steve Gottlieb]

Thanks, Victor, this makes it convenient to add the high VV numbers (part II) to my observing notes database.

-- Steve

> On Jan 20, 2025, at 1:12 PM, Victor van Wulfen <vic...@clearskies.eu> wrote:
>
> Hi all,

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[owen...@gmail.com]

For those that are interested here is the combined VV catalogue http://www.sai.msu.su/sn/vv/

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/246E3EC0-980D-4E8F-B120-5ABCFA9B747B%40gmail.com.

[Scott Harrington]

Thanks a lot for taking the time to share your list, Steve. If it means anything to you, I have no intention of trying to write an S&T article on these because they are pretty boring to look at beyond seeing them as a nonstellar double star.

I did a SIMBAD search for each one you listed and was able to get over a dozen that I think fit my criteria. But, I'm not gonna lie...I got the most excited when I saw that IC 1623 has a lot of H II involved and that NGC 1592 was mostly a star-forming region. Yay!! Two more galaxies I had no idea existed that display my kinda features. I can't wait to swing my 16-inch there way on Friday evening.

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/034001db6b82%2442585f90%24c7091eb0%24%40gmail.com.

[Akarsh Simha]

This looks like a list that might be worth featuring on the website if there are no plans to write about it in S&T or such, Steve / Scott :-)

I'd be happy to put it on the site if you sent me a formatted e-mail.

Regards

Akarsh

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[owen...@gmail.com]

I have built the list in SkyTools 4 if anybody else uses that program

 

Owen

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[Scott Harrington]

Hi Akarsh,

In regards to getting permission to create something for ADS, that will be up to Steve since it was his list. I may pen something for the Deep-Sky Observer in the future, but at the moment I don't have the needed observations of those that fit my criteria. In regards to getting it created/formatted for ADS, unfortunately, I'm juggling too-many projects at the moment!

To Owen: I would personally remove NGC 1592 from any list of "double galaxies" since it's too disturbed. If we start including it, then the floodgates open to such galaxies as NGC 4038/39, ect. But that's just my opinion since I want to see two distinct cores in my project...not two barely discernible SFRs (which are part of a different project of mine).

NGC 1592 PanSTARRS

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[owen...@gmail.com]

OK I can do that

 

From: adventures...@googlegroups.com <adventures...@googlegroups.com> On Behalf Of Scott Harrington
Sent: 22 January 2025 15:41
To: adventures...@googlegroups.com
Subject: Re: [ADS] 'Double Star' Galaxies, Anyone?

 

Hi Akarsh,

In regards to getting permission to create something for ADS, that will be up to Steve since it was his list. I may pen something for the Deep-Sky Observer in the future, but at the moment I don't have the needed observations of those that fit my criteria. In regards to getting it created/formatted for ADS, unfortunately, I'm juggling too-many projects at the moment!

 

To Owen: I would personally remove NGC 1592 from any list of "double galaxies" since it's too disturbed. If we start including it, then the floodgates open to such galaxies as NGC 4038/39, ect. But that's just my opinion since I want to see two distinct cores in my project...not two barely discernible SFRs (which are part of a different project of mine).

 

NGC 1592 PanSTARRS

To view this discussion visit https://groups.google.com/d/msgid/adventuresindeepspace/CAGmLLxsYbBU2-UJgCNY_NB6t07OEGdZRjH64unZe9CKSh_A2Cw%40mail.gmail.com.

[Uwe Glahn]

You like fussy double stars Scott? Maybe you can scan my sketching
compilation of galaxies http://www.deepsky-visuell.de/GLX.htm or galaxy
groups http://www.deepsky-visuell.de/GLX_Gruppen.htm and find something.
There are even more, depending what aperture you use.

A quick overlook gave me:
- NGC 750/751
- NGC 1203
- NGC 1409/1410
- NGC 1587/1588
- NGC 2672/2673
- NGC 3047/3047A
- NGC 3226/3227
- NGC 4211
- NGC 4782/4783
- NGC 4893
- NGC 6090
- NGC 6692
- NGC 6825
- NGC 7066
- IC 5378/5379

- NGC 507
- NGC 1117
- NGC 2292
- NGC 3406
- NGC 4054
- NGC 5718
- NGC 6580
- NGC 7452
- HCG 5
- UGC 827

Another interesting question and list could be a list where galaxies pairs
are include which are within the halos and show NO interaction. I mean
pairs, which lies in the line of sight, like NGC 3314 or IC 5328. Maybe I
start a new thread because of the question.

-----Ursprüngliche Nachricht-----
From: Victor van Wulfen
Sent: Sunday, January 19, 2025 11:19 PM

To: adventures...@googlegroups.com
Subject: Re: [ADS] 'Double Star' Galaxies, Anyone?

email to adventuresindeep...@googlegroups.com.

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[Scott Harrington]

Thanks for the list, Uwe! I was able to extract a few that might fit my criteria. It's essentially a project way to the side since I've got more important ones ongoing.

I observed NGC 1516 the other night in my 10-inch. Akarsh had mentioned it and I thought it looked good in the DSS images. Turns out, the core of two spirals are way less concentrated than that of two distant elliptical galaxies. At 94x, I glimpsed the pair and thought I could occasionally split them. Turns out, I was only detecting the pair as one while the star just south of them was the other "member" since at 260x NGC 1516 was a faint, fuzzy pair that wasn't easy to split!

Scott H.

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