Cancer - Arp 82, SHK 185, Hickson 37

[Mike JW]

A recent target in cancer  was another look at the Flat Galaxy UGC 4856 (RFGC 1508) which is part of Hickson 37. So two for the price of one.

 

 

Arp 82 classified by Dr Arp as  spirals with a high surface brightness companion. The inset reveals star formation knots, arms do not come off the core. Instead they come off the ring structure (hint of it in this shot). The companion is also a ring galaxy. They are about 200 million lyrs away.

My final offering is SHK 185. Tricky to locate.

 

 

[Bill S]

Excellent shots. Very interesting structure to NGC 2535 (Arp 82). There's a lot going on in that galaxy. UGC 4856 really is very thin/flat from the angle we see it. There's some more background on the Webb Deep Sky Society's site. Hickson 37 was the Galaxy of the Month for February 2013.

https://www.webbdeepsky.com/galaxies/archive/galaxy/2013/Feb

You certainly need to push things to see that SHK. I'm sure I'd struggle.

[Mike JW]

Hi Bill, thanks for the link. It seems to me that a selection of scopes for use with EAA is a useful approach (and expensive). The C11 certainly makes the SHK groups easily doable but then a smaller scope gives the wider fov for star clusters, comets, bigger galaxy groups. I find using the 15" Dob even better for faint DSOs except it does not track very well compared to an equatorial mount.  Mike

[Martin Meredith]

Great shots and report Mike. Here's my Arp 82 from about a year ago with about double your exposure. I'm seeing more detail in the upper arm in your shot -- impressive!

[Mike JW]

Hi Martin,

I too was impressed with the detail in my image of Arp 82. I think I am getting better at deciding on the length of subs, number in a stack to tease out the detail. Anybody following our posts hopefully is able to get a clear idea of what different scopes/subs/stacks can achieve, as well as the fun/fulfilment of using the EAA approach.

Thanks for posting your shot.

Mike

[AKB]

Quite at random last night (a bit fraught what with testing software and a recent camera change) I settled upon Arp 82, aka NGC 2535 + NGC 2536, or VV9 (always a problem to know where to post these things!)

Wide field shows it in a wonderful star-studded background (some actually rather bright stars) and a plethora of galaxies, some that I can detect around mag 18 at formidable distances (2–3 Gly) and others, according to the chart, at around mag 20 at 6 Gly, that need the 'eye of faith'.

The zoomed-in images don't really add anything to the observations above, but I was, anyway, delighted to have stumbled on these gems...  I really must learn to plan better, although, once again, this was really a bit of a shake-down for the gear.

Tony

 

 

   

 

[Martin Meredith]

1 hour ago, AKB said:

Quite at random last night (a bit fraught what with testing software and a recent camera change) I settled upon Arp 82, aka NGC 2535 + NGC 2536, or VV9 (always a problem to know where to post these things!)

That'll be me, posting software updates 😀. Do these images benefit from your new noise reduction algorithm and/or sharpening?

Impressive as ever to see these objects in a wider field.

Martin

[AKB]

Yes, that was you (but  many thanks for the latest updates!)

This camera is really quite low noise (especially running at -10ºC) so on its own, the noise suppression probably doesn't have much to offer in this case.  I adjusted the levels so that you can see the background noise.  Once sharpened, however, the high frequency noise can be pushed back somewhat.

Here is a sequence of three images:

1. no sharpening or noise suppression
2. with some sharpening (and no other changes of level)
3. with sharpening and noise suppression (again, no level changes)

We do, now, have more than enough parameters to play with, so this is hardly a definitive example.

Perhaps we need further discussion on the Jocular thread, or somewhere more appropriate.

Tony

 

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Edited March 25, 2022 by AKB

[AKB]

Looking again at the wider field, I've only just spotted these in the top right-hand corner!

[Martin Meredith]

17 minutes ago, AKB said:

Perhaps we need further discussion on the Jocular thread, or somewhere more appropriate.

 

Good idea.