Hydra Galaxy Cluster Abell 1060 22 hrs in colour

[Placidus (Mike and Trish)]

Originally Posted by John Hothersall

A great result, 3314 is really hard for most to image. Love the long star spikes.

John.

Thanks, John.

Originally Posted by Ryderscope

A jaw dropping and eye popping image definitely reminiscent of the Hubble deep field to be sure.

Hi, Rodney, glad you like it.

It was definitely a fun and rewarding target.

[markas (Mark)]

Great colour and detail. I like this one a lot.

Mark

[codemonkey (Lee)]

https://i.imgflip.com/26w6rq.jpg

Great work guys, a lovely field! Thanks for sharing.

Nit picking again, but some of the stars look a bit green.

[Octane (Humayun)]

Simply outstanding, my friends. It's been a feast for the eyes!

H

[Geoff45 (Geoff)]

Absolutely sensational guys. Colours are really great. There is a real sense of infinite depth.

[Placidus (Mike and Trish)]

Originally Posted by markas

Great colour and detail. I like this one a lot.

Mark

Thanks, Mark, glad you like it.

Originally Posted by codemonkey

https://i.imgflip.com/26w6rq.jpg

Great work guys, a lovely field! Thanks for sharing.

Nit picking again, but some of the stars look a bit green.

We can see what you mean about the green. Will investigate.

Originally Posted by Octane

Simply outstanding, my friends. It's been a feast for the eyes!

H

Thanks so much, Humayun, that is very encouraging.

Originally Posted by Geoff45

Absolutely sensational guys. Colours are really great. There is a real sense of infinite depth.

Hi, Geoff! Lovely to see you on deck again, and thanks for the very generous comments.

Very best,
Mike and Trish

[atalas]

A wonderful deep field well done again guys!

[Placidus (Mike and Trish)]

Originally Posted by codemonkey

... some of the stars look a bit green.

We've had a closer look now. You are right that there is an issue to be fixed: a handful of the brighter stars have assymetrical green fringes, especially a green smudge toward bottom right of the star. It's not overall colour balance: reducing the green channel strength hopelessly messes up the colour balance for the image as a whole. Looking at the faintest stars, the registration of R, G, and B on the great bulk of fainter stars seems pretty accurate, so it's not a registration error. We could apply a finger-painting cosmetic fix, but that would be wicked and sinful. We throw up our hands in dismay. Please avert your gaze, and enjoy the galaxies!

Originally Posted by atalas

A wonderful deep field well done again guys!

Thanks Louie!

Best,
Mike, Trish, and Kermit

[codemonkey (Lee)]

Originally Posted by Placidus

We've had a closer look now. You are right that there is an issue to be fixed: a handful of the brighter stars have assymetrical green fringes, especially a green smudge toward bottom right of the star. It's not overall colour balance: reducing the green channel strength hopelessly messes up the colour balance for the image as a whole. Looking at the faintest stars, the registration of R, G, and B on the great bulk of fainter stars seems pretty accurate, so it's not a registration error. We could apply a finger-painting cosmetic fix, but that would be wicked and sinful. We throw up our hands in dismay. Please avert your gaze, and enjoy the galaxies!

Hey guys,

First of all I want to reiterate that it's a great image, no question about it, as attested by all the other comments in this thread.

Since moving to a newt and dealing with errant star shapes for months I think I've become hypersensitive to stars. I've looked back at some of my own data since and been amazed that I hadn't noticed issues that are clearly obvious to me now.

Could also be a difference in monitor calibration, though I did calibrate mine recently and I'm sure you guys have done the same.

Anyway, I wouldn't lose sleep over it and I hope I didn't offend. I tend not to post too much on other people's images because usually I have nothing to offer other than "great work"... I do try to offer what I see as opportunity for improvement, even if slight as I feel like that adds some value.

Cheers,
Lee

[Placidus (Mike and Trish)]

Thanks for the reassurance, Lee, but no, we were honoured that you had looked carefully at the image. We're still wondering about what went wrong. Dirty optics? One sub where the green tracking went wrong? We've been putting all our efforts elsewhere with a long run of moonlit but crystal clear nights. What a great excuse for laziness!

[strongmanmike (Michael)]

Originally Posted by Placidus

We've been putting all our efforts elsewhere with a long run of moonlit but crystal clear nights. What a great excuse for laziness!

Don't ya juuust love it when the crystal clear nights are so beautifully lit by the Full Moon.....NOT

Mike

[SimmoW (SIMON)]

Superb team, so deep and unusual.

I wonder if you can teach me, are all those redder galaxies that colour due to red shift? Or just because of a predominance of older stars? Cool stuff!

[Placidus (Mike and Trish)]

Originally Posted by strongmanmike

Don't ya juuust love it when the crystal clear nights are so beautifully lit by the Full Moon.....NOT

Mike

It's been even clearer, and no wind, over the last three nights of totally full moon. So we went out and howled.

Originally Posted by SimmoW

Superb team, so deep and unusual.

I wonder if you can teach me, are all those redder galaxies that colour due to red shift? Or just because of a predominance of older stars? Cool stuff!

Thanks Simon! Just a guess, but I think that the ellipticals are red mostly because they are very old and have run out of free gas for making new stars. To be noticeably red because of red shift, they'd have to be at least a couple billion light years away (ie small compared with 13.4 billion), and therefore at least a thousand times further away than M32 at 2.5 million, and therefore only a pixel across and too small and too faint to see. It would be interesting if someone has a more solid answer.

Happy Easter,
Mike