Well...there are a few of'em up there but...after Omega Cen, 47 Tuc and M22, NGC 6752 in Pavo is the 4th brightest and certainly the unsung hero of globular clusters.
6752 is probably the most photogenic of the globs. Nicely done. But hey, its not done with an FSQ?? whatttt?
Correct colour of stars in globs has been a topic recently on this site. Globs are older stars and typically dominated with sunlike yellow old stars. I wonder if it should show more yellow stars or is the colour correct (not a criticism more of a question).
Cheers guys ...hadn't done a glob in a while and wanted a quick fix
As to the correct colour Greg, NGC 6752 sits in a area of sky with very little obscuration/extinction from dust, so, unlike many other globs, there is almost no interstellar reddening. If you look closely, there is indeed a nice spread of mostly yellow-white stars, with a good spattering of yellow-orange ones plus a few tiny almost red ones and then quite a few blue stragglers,. These colours and hues will vary somewhat across different screens but overall this is certainly what we would expect but, as you say, perhaps the bulk of the yellow-white stars could be a little more yellow/red..?
Mike
Last edited by strongmanmike; 21-08-2017 at 09:53 AM.
Cheers guys ...hadn't done a glob in a while and wanted a quick fix
As to the correct colour Greg, NGC 6752 sits in a area of sky with very little obscuration/extinction from dust, so, unlike many other globs, there is almost no interstellar reddening. If you look closely, there is indeed a nice spread of mostly yellow-white stars, with a good spattering of yellow-orange ones plus a few tiny almost red ones and then quite a few blue stragglers,. These colours and hues will vary somewhat across different screens but overall this is certainly what we would expect but, as you say, perhaps the bulk of the yellow-white stars could be a little more yellow/red..?
Mike
Yes I saw that spread of colours, that's why its more of a question than a comment about the image. For sure Omega is often shown as too blue/white. I am not sure how that translates to other globs.
6752 is probably the most photogenic of the globs. Nicely done. But hey, its not done with an FSQ?? whatttt?
Correct colour of stars in globs has been a topic recently on this site. Globs are older stars and typically dominated with sunlike yellow old stars. I wonder if it should show more yellow stars or is the colour correct (not a criticism more of a question).
Greg.
I agree with Greg, it should be yellower. Gratton (2003) calculated it as been 13.4 billion years old, a paper in 1996 had it at 13.5-14.6 and Wikipedia says 11.5.
Yes I saw that spread of colours, that's why its more of a question than a comment about the image. For sure Omega is often shown as too blue/white. I am not sure how that translates to other globs.
Greg.
Yes I got that, all good discussion I am waiting for the new Robofocus bracket....but I'm in no hurry, it will be a major reconfigure so I'm just taking my time...the FSQ looks beautiful sitting on the side board in the lounge though...I salivate everytime I walk past it
Quote:
Originally Posted by SimmoW
Great catch Mike, but what's this mere 3hrs of data? Hope you aren't trying to copy me!
Hehe, just joking, looks deep enough from here
Yes, fixation on exposure time wastes a lot of peoples time, many objects simply don't need it for a pleasing result ...particularly with the H694 and 12" at F3.8
Quote:
Originally Posted by topheart
Great work Mike!
Cheers,
Tim
Thanks Tim, we don't do many globs, sometimes they are a nice break from....The Running Chicken or Lagoon
Quote:
Originally Posted by Atmos
I agree with Greg, it should be yellower. Gratton (2003) calculated it as been 13.4 billion years old, a paper in 1996 had it at 13.5-14.6 and Wikipedia says 11.5.
11.78 billion years old. Off the top of my head should have the average star mass at 0.9 solar masses.
Very nicely resolved however!
I do agree with you guys but it's a little bit semantic.... and besides, presenting it somewhat whiter keeps it looking a tad more like its visual appearance
Quote:
Originally Posted by DJT
You just cant go past a well done Glob and this cluster is also one of my favourites.
Thanks Dave, the Tak106 will be underway soon...
Quote:
Originally Posted by cometcatcher
Looks like the brightest going by your image Mike. It's a beauty.
Cheers Kevin, I tried to keep the bright look intentionally actually, I like the brilliance ...although I'm not totally happy with the handling of the core, it's a very bright concentrated core (bit like 47Tuc) so trying to reveal a little of the inner resolution is hard to match in naturally while still keeping the relative brightness balanced....
A spectacular Glob Image in my books there, Mike, the flow of light/brightness levels from the outfield into the core is always a tricky, the actual globs vary this way as much as they appear in different images; that I do know, who' d of thunk ;-)
A great rendition with this you did, here, very pleasing to the eye
A spectacular Glob Image in my books there, Mike, the flow of light/brightness levels from the outfield into the core is always a tricky, the actual globs vary this way as much as they appear in different images; that I do know, who' d of thunk ;-)
A great rendition with this you did, here, very pleasing to the eye
That's a nice NGC 6752 Mike. I've been thinking of doing this one myself as it's one I go back to every few years. I've always rated it third best after Omega and 47 Tuc because of the strong central condensation. I actually wasn't aware that M22 is slightly brighter.
Thanks Steve, always a good one to show newbies this time of year through a scope, while Omega is out of sight and 47 Tuc is low in the sky in the early evening
I am waiting for the new Robofocus bracket....but I'm in no hurry, it will be a major reconfigure so I'm just taking my time...the FSQ looks beautiful sitting on the side board in the lounge though...I salivate everytime I walk past it 
..The Running Chicken or Lagoon 
