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Finished the last one, took 5 years

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#1 Rick J

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Posted 11 November 2013 - 04:04 PM

Arp 218 is the last of the Arp galaxies I can reach from my latitude. There are a couple more I might be able to hit but are so low my window is only about 20 minutes long and I'd need 5 super nights to get the data. As I have about that many a year it is unlikely I'll capture those unless something happens to my Meridian Tree.

Arp 218 is located in eastern Serpens Caput not far from the famous Hercules Galaxy Cluster. It may be a member of the Hercules super cluster as one paper I did find considers it as such but provides little else. That may help account for the rather rich field of distant galaxies in the image. Unfortunately while it is the last of the Arps I imaged it is also the least researched of those I have taken which is the vast majority of them. For instance there are only 6 papers listed in SIMBAD, all of which are just listings mentioning it or Arp's catalog entry. A couple papers consider it a M51 type of interacting pair but only list it as such an example. There's not even any distance estimate for it that I could find. Virtually all I could find on them is shown on the annotated image. They may be members of the same group those at 650 million light-years in the image. That's only a guess on my part.

The eastern member has an apparently tidally distorted arm that curves back on itself making the appearance of a loop though I doubt that is really the case if seen from a different angle it likely goes far behind or in front of the galaxy rather than looping back into the galaxy's core. Arp put it in his class for galaxies with "Adjacent Loops", whatever that means. He left no note on this pair so your guess is as good as mine. Partway up the loop is a bright blue star forming region that appears almost star-like in my image. It's clearly a star knot in the Sloan image I've attached. Or so I thought. NED however lists it as a separate galaxy both with a Sloan ID and one from the new ASK catalog. Though it gives no size, magnitude or classification it does give a redshift! That puts it about 670 million light-years distant. That is 100 to 200 million light-years more distant than the various clusters making up the nearby Hercules Super Cluster. For now I'm saying it is part of Arp 218 and not a separate galaxy.

The western member is unclassified. It has a very bright star cluster at its northeastern end. It has a rather red core and the southwest side is very blue indicating a spiral type galaxy with the NE end highly disturbed creating a super bright star cluster. I mistook it for a star on my image but the Sloan image under far higher resolution shows it to be part of the galaxy.

The annotated image details all the galaxies for which NED had distance data. There were many I'd like to know more about but it just isn't available. South of Arp 218 are a pair of very small blue galaxies. The northern one appears to be a disk galaxy that is highly warped. Below and to the west is another very blue galaxy, an obvious spiral. It too appears distorted. Are they an interacting pair? It's unusual to see an edge on spiral that's as blue as this northeastern one is. Both are bluer than expected which could be due to "recent" star formation due to interaction.

There's a galaxy northeast of CGCG 107-053 that appears to have a very off center core. But it is at a very different distance than all its apparent neighbors. How did it get so distorted?

UGC 10084, CGCG 107-053 and a couple others appear to be part of the same group as Arp 218. CGCG 107-053 is a neat, tightly wound spiral while the much closer UGC 10085 is a very interesting multi-arm with very irregular widely spread arms. I wish it was closer so we could get a better look at it. it is quite a contrast compared to the CGCG spiral.

Arp took his image of Arp 218 under very poor seeing conditions, even worse than mine allowing me to capture more detail than he could. Nice to out-shoot what was "The World's Largest Telescope" for most of my life. The idea it could happen was less believable to me than I'd have a computer more powerful than those taking up entire floors of climate controlled buildings in the 50's.

Sloan image of Arp 218

Arp's image http://ned.ipac.calt...big_arp218.jpeg

14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME

Full image at my usual 1" per pixel

Annotated

Attached image is at 0.80" per pixel about the same as the image scale of the Sloan image.

Rick

Attached Files



#2 lambermo

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Posted 11 November 2013 - 04:27 PM

Congrats on finishing your visible ARP list ! I've enjoyed most of em :)

And of course I'm very curious as to what you'll be imaging next. I've often wondered what your images would look like with 10+ times the integration time than what you usually put in. But I suspect you already have a looong new todo list, right ?

-- Hans

#3 David Pavlich

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Posted 11 November 2013 - 05:47 PM

Terrific accomplishment, Rick! :bow:

David

#4 Leonardo70

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Posted 12 November 2013 - 05:17 AM

An ARP of congrats Rick.

All the best,
Leo

#5 Nicola

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Posted 12 November 2013 - 06:23 AM

Great accomplishment Rick, well done.

#6 Louietheflyisme

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Posted 12 November 2013 - 06:33 AM

Great job.

#7 broca

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Posted 12 November 2013 - 09:10 AM

We'll done Rick! I've enjoyed looking at and reading your post. You covered quite a bit of ground. I hope you continue to bring this community targets that are off the beaten path soon.

#8 dan17

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Posted 12 November 2013 - 12:10 PM

Congratulations Rick. Unbelievable work. Looking forward to see next series of "Universe From Back Garden"
Thanks for sharing :mad:

#9 rigel123

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Posted 12 November 2013 - 12:18 PM

Fantastic Rick, congratulations! As others have asked, what's next???

#10 JWalk

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Posted 12 November 2013 - 04:09 PM

I admire your dedication Rick!! Great stuff.

#11 Rick J

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Posted 12 November 2013 - 11:50 PM

Thanks all. It was a fun project. Some of the older ones need reprocessing when I can find the time for it.

As for what's next there's no catalog I'm trying for everything that's in it. I am working on Hickson galaxy groups, especially those with signs of interaction as well as interacting pairs and of course peculiar galaxies that could have been in Arp's Atlas of Peculiar galaxies.

While many dark nebulae are too large for my system there are some that fit and are in my to-do list. I'm working on those objects in the Herschel 400 list I did visually in the mid 1980's that fit (some clusters are too big) and are north of -15 degrees which is my usual southern limit. Though the Meridian Tree has been getting wider of late so I may have to limit that to -10 degrees pretty soon. At -15 degrees I can only get about an hour of imaging in a night so anything takes 2 nights of exceptional seeing. Then those vdB objects that fit my field and don't have a really bright illuminating star are on the list. Really bright stars create some nasty reflections as bright as the nebula I'm trying to capture. It seems to come from the corrector. I'll need a different scope for those. There are some planetary nebula on the list as well though my seeing makes getting the small ones rather difficult.

Still there's over 800 objects on the to-do list and I'm finding new ones for the list faster than this year's weather is allowing me to capture them. Even with the bad weather I still can keep up posting one every other day for several more months even if it it totally cloudy the entire time. A few that have been posted here many times are in the queue. Surprising I know but I'd never taken them in all my near 60 years doing this. Seems my interest in the rarely seen goes back many decades. Next up I hope to finish tomorrow is a pair of likely interacting galaxies, one of which made the 2 micron flat galaxy catalog so fits under two of my common interests.

Rick

#12 kfir Simon

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Posted 13 November 2013 - 12:47 PM

Great image and a very challenging project.
I envy your patience on these tough targets.

All the best,

Kfir

#13 Thomas Davis

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Posted 13 November 2013 - 01:13 PM

You are amazing. You have consistantly round and colorful stars, and of course, great galaxies. I too am trying to finish a catalog, vdB, but I don't know if I'll be able to do it. I used to image 8+ hours per image to get detail, but now If I can get 4 hours I'm good.

Great job and congratulations!

-Tom

#14 microstar

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Posted 13 November 2013 - 11:45 PM

Excellent job Rick. Perseverance pays off!
...Keith

#15 Rick J

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Posted 14 November 2013 - 02:01 AM

Again thanks. It was fun with a goal to reach. Others, more southerly located have managed them all but most in mono. Think I have more in color than anyone. Certainly those I'm aware of.

Tom, I love the Paramount it never lets me down. Contrary to the many other mounts I've owned over the years. I throw out frames due to seeing, clouds, focus changing faster than temperature compensation can keep up with and especially idiots on the lake with super powerful lights hitting the observatory. Usually first by accident then returning trying to figure out what the strange building it all the while hitting it with 3 million candle power. Makes for a possible flat frame if not saturated but little else of use. But I can't recall ever losing a frame due to the Paramount not doing its job. Don't recall owning anything as dependable. With a good mount this hobby is a joy.

Now if the weather would just cooperate.

Next up after a day in the hospital with a fractured skull thanks to an idiot truck driver driving way too fast on ice and spinning out of control into me sending us over a 15 foot bluff, is a pair that could have made Arp's Atlas but didn't for some reason. After that -- find a new car once my body decides it can move again.

Rick

#16 rigel123

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Posted 14 November 2013 - 12:20 PM

Ouch, here's hoping for a speedy recovery and glad it wasn't worse!

#17 Rick J

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Posted 14 November 2013 - 04:35 PM

Fortunately today's cars are designed to take the bullet for the occupants. Looking at the car it's hard to understand how my wife and I survived.

Rick






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