The Third Brightest Globular: NGC 6752 in Pavo

[SkyViking (Rolf)]

Originally Posted by RickS

Very nice result, Rolf. The wire spider works really well!

Thanks a lot Rick, yeah I very much enjoy having the wire spider.

Originally Posted by Stevec35

That's a good NGC6752 Rolf. Lovely rich colours.
Cheers
Steve

Thank you Steve

Originally Posted by TrevorW

Nice one Rolf

Thanks Trevor

Originally Posted by bmitchell82

Nice image Rolf all the normal parts are spot on, the only thing that isn't really to my flavour is the electric blue stars and the deep orange. Flavour is what one makes it though!

Thank you Brendan, do you mean they should be more red rather than orange, or that the whole cluster should be more white as globulars are traditionally presented?

Originally Posted by gregbradley

Very nice. I love these golden stars in these globs. I guess they show that they are really old stars.
Greg.

Thanks Greg, yes I tried to show the actual colours of this globular.

Originally Posted by alpal

That's a great pic.
You have such fine detail & plenty of colour.

Thank you, yes the colours are the main feature of globulars I think, but it's not often brought out in the processing.

Originally Posted by Craig_L

Well done Rolf - great detail. My only comment is I'd like to see the stars a lot brighter, less colour - they are suns.

Thanks Craig It's probably a matter of taste, most globular images show them quite white, where in reality they are reddish. I tried to bring out the latter here.

Originally Posted by Gem

One of the great objects - yet not so well known.
Good to see some images!
Q. When giving the length of exposures (24:8:8:8) ... is that the total of the stacks or a length of each single image? Just trying to work out how long to expose for...

Thank you Grant Yes 24:8:8:8 is the total. Each L frame was 90 seconds and RGB was 60 seconds each. I would have gone longer but the Moon light prevented this.

Originally Posted by strongmanmike

Excellent result Rolf, you are on a roll with these globs
Mike

Thank you Mike - I had to image something while I wait for the Moon to disappear But they turned out quite nice indeed!

Originally Posted by Lester

beautiful image Rolf, the different coloured stars make this a outstanding view. Thanks.

Thanks Lester, glad you liked it

Originally Posted by iceman

Wow, stunning as usual Rolf!
Nice!

Thank you for your kind words Mike

Originally Posted by marco

Very nice, Rolf, colors are very saturated and add lots of beauty to the picture IMHO!

? I didn't know it, what is the ranking? I supposed it was Omega/47 tuc/M13..
Another question: I don't usually image with LRGB if the moon is up, apart from gradients do you find a big difference comparing to RGBs you get on moonless nights?
Marco

Thank you Marco, Mike beat me to the ranking
I find that, apart from limiting magnitude, the challenge on moonlit nights is mainly the gradients. In some directions I get quite strong flares and stray light from the Moon, so I'm limited in what I can image when the Moon is up. Of course it doesn't help that I use a truss tube scope - I should paobably make a shroud some day.

Originally Posted by Paul Haese

Nice work Rolf. Composition, star colours and resolution all great.

Thanks a lot Paul, glad you liked it

Originally Posted by strongmanmike

Ah huh!
We have 7 of the top 10 brightest Globulars well down in the southern hemisphere incuding the three brightest!
1) Omega centauri in Centaurus Mag 3.9 Dec -47
2) 47 Tuc in Tucana Mag 4.91 Dec -72
3) NGC 6752 in Pavo Mag 5.4 Dec -59
4) M13 in Hercules Mag 5.8 Dec +36
5) NGC 6397 in Ara Mag 5.9 Dec -53
6) M22 in Sagittarius Mag 6.17 Dec -24
7) NGC 2808 in Carina Mag 6.2 Dec -65
8) M3 in Canes Venatici Mag 6.2 Dec +28
9) M15 in Pegasus Mag 6.2 Dec +12
10) M55 in Sagittarius Mag 6.3 Dec -31
NB. Of these 10, only really M13 is not well placed for viewing from mid southern latitudes (although still a good view when crossing the meridian from most of Australia) all the others are easy pickings!
So see?.. this is yet another reason why you located your APO down under
Mike

Hehe thanks for the info Mike, always good to be reminded of how spoiled we are down this way

Originally Posted by madbadgalaxyman

Not only is N6752 the third brightest globular, it is also one of the nearest! According to the Globular Cluster Catalog of W.E. Harris, it is at 4 kiloparsecs, in other words.....13,000 light years.
This relatively small (for a globular!) distance is one reason why this is one of the few globulars in which stars can easily be seen when visually observing with a 3 inch telescope.
But M22 is even nearer (3.2 kiloparsecs).....that's why it is so gigantic, in angular diameter.
cheers, mad galaxy man

Thanks for the details Robert. I thought M4 was the nearest, at some 7500 light years?

Originally Posted by citivolus

The Starfish is one of my favourite naked eye globs, and is a worthy imaging target as well, as you have shown.

Thank you Ric, yes visually it's very impressive too!

Originally Posted by rogerg

Nice photo. I like the star colour and clarity. Looks to me like the background could be blacker, but it's OK.
Interesting info coming up in the thread too.

Thank you Roger. I think you are right about the background, I'll have a look again.

Originally Posted by madbadgalaxyman

Here is The Catalog of Milky Way Globular clusters, by Bill Harris (W.E. Harris). It should be about as up to date as any catalog of globulars can be, because Harris has spent his entire life researching globular star clusters.
Attachment 114787
There are some very exciting & gripping & interesting numbers here. This catalog reads like a thriller!!
(("Notepad" in Windows, mucks up the formatting of this text file, but any of the millions of text file readers available on the internet will display this file properly.
"WordPad" will probably work. ))

Thanks for that Robert, that's a great list for us globular aficionados I'll look forward to tracking down some of the more challenging ones there.