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Cosmic Challenge: Abell Galaxy Cluster 426

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#1 PhilH

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Posted 07 December 2017 - 06:14 AM

Not long after I got my first "good" telescope, my 8-inch Criterion RV-8 Dynascope Newtonian reflector, as my Christmas gift in 1971, I became fascinated with the Perseus Galaxy Cluster.One reason I am so fond of this collection of more than 500 galaxies is that the cluster grows as the telescope's aperture increases. Small backyard scopes will show the two big kids on the block, NGC 1272 and NGC 1275, but even the largest amateur instruments fail to show all of the "little guys."

Click here to view the article
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#2 nicknacknock

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Posted 07 December 2017 - 06:34 AM

Nice one Phil!

 

On the bucket list - yes, I have a Sky Safari list appropriately labelled "Bucket List"!


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#3 Redbetter

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Posted 07 December 2017 - 07:02 AM

500 galaxies...what did I do to you, Phil?  Are you trying to kill me via sleep deprivation?  

 

Oh well, I guess there are worse ways to go than seeing how deep one can peer into an Abell Galaxy Cluster.

 

Thanks for the article, I suppose I need to start marking up that A4 Uranometria chart so that I am ready to go really deep.   

 

Kudos for listing v, b, and p where known.  V is often 0.5 to 1.0 mag brighter than b or p so this can have substantial impact on visibility for those with smaller scopes and/or in poorer skies.


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#4 NiteGuy

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Posted 07 December 2017 - 12:40 PM

And now this, just when I thought knocking off 60 of M31's globular clusters in one night with the 17.5" was a nice accomplishment. Turns out that was just a drop in the bucket (list).



#5 TOMDEY

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Posted 11 December 2017 - 09:14 AM

Thank you, Phil. Abell Clusters are my favorite objects! Ah, yes! I looked at A426 this past Oct18/19, with the JMI RB-16 binos. Here's from my journal: "1281, etc. Perseus Cluster, loaded with galaxies! Individual galaxies tough among stars at 102x. So, yes, I do see it pretty well, but recall the 29, under great conditions was much easier. Night Vision definitely helps, shows myriad galaxies in field, ten, at least distinct ones vs like two with the Panos at 102x. But, the NV impression is WAY different [80x]. The galaxies (vs stars) have soft halos and all have star-like, softish cores (ie the NIR penetration). The NV is not aesthetic, but certainly distinguishes galaxies from stars. Good Night! ~fin~"  Then, just last night, Dec 10th, I reviewed all of my astrophoto negatives from 1984-1992. Quite a few Abells in there too!  Tom



#6 TOMDEY

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Posted 11 December 2017 - 09:25 AM

Ummm... Phil, your annotation to the eyepiece sketch, "the author's 18-inch (46cm) refractor." REFRACTOR?! If so, WOW!  Tom



#7 Dave Mitsky

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Posted 12 December 2017 - 02:28 AM

The last time that I observed A426 was on the night of November 24th. I had a brief look at the center of the cluster through a 25" Obsession Dob belonging to a fellow CAS member. I would have tried to do a better count than I did but the position I was in on the ladder was a bit uncomfortable.

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#8 Shneor

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Posted 14 December 2017 - 01:17 AM

My favorite galaxy cluster. I observed it last on December 9th at Lake Sonoma. Unfortunately, transparency was not great but at least half a dozen galazies were visible in a 34' field at 250X. I've much better views at Shot Rock (7650 ft. altitude and a dark sky), but that's snowed in as far as I know. Great choice!

 

Shneor Sherman



#9 Redbetter

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Posted 14 December 2017 - 06:01 PM

I have augmented Phil's list with another 17 in Uranometria's circle for the cluster, and 73 others that would fit in Phil's closer up chart (dimmer ones that in Wikisky appear in range of my scope.)  I have only had time to actually log 25 so far down to visual mag ~16 - 16.5.  It is going to take some time to log the other 100+ if I can get to observing all of them.  There are more to put on the observing list if I go wider... 



#10 John O'Hara

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Posted 16 December 2017 - 11:47 AM

I've seen some of the brighter members through my old 6" f/8 A-P refractor, but for some reason, I've never turned my 12.5" Dob. toward it.  

 

My club recently took delivery of a 30" f/3 (f/3.5 with Paracorr) Starstructure with a Lockwood mirror.  This cluster is one of the "objects" I want to see through this scope, but in my neck of the woods, lake-effect cloud cover is in play from Oct. through April, with clear skies quite rare.  We'll see.



#11 Redbetter

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Posted 25 January 2018 - 02:29 AM

I keep coming back to this one an hour or two every other session.  I keep adding more to look for in the big circle of the A4 Uranometria chart based on survey images.  I have logged 122 so far and have dozens more plotted to search for...and more areas that I need to check in the survey to go deeper.   

 

I don't know that I will finish it this winter, the site I use has some trees that cut short observing in that direction.




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