Spiral Galaxy NGC7424 10 hours

gregbradley · #1 02-12-2013, 07:54 PM

Here's an image of NGC7424 I took a little while ago.

Its quite dim and small and this is 10 hours of total exposure.

CDK17, Proline 16803, PME.

http://www.pbase.com/gregbradley/image/153301585/large regular size

http://www.pbase.com/gregbradley/ima...01585/original large size

Greg.

tilbrook@rbe.ne (Justin Tilbrook) · #2 02-12-2013, 07:59 PM

Very good image of NGC 7424 Greg!

One thing that puzzles me, there seems to be no HA regions showing.

Cheers,

Justin.

RickS (Rick) · #3 02-12-2013, 08:14 PM

Tough target, Greg! You got a decent result for the time but it's a galaxy that needs lots of data. HyperLeda gives a surface brightness of only 23.43 +/- 0.25 mag/arcsec^2.

Quote:

Originally Posted by tilbrook@rbe.ne

One thing that puzzles me, there seems to be no HA regions showing.

They are there but also very dim. I had traces of them in my 18 hour Qld Astrofest image.

Cheers,
Rick.

gregbradley · #4 02-12-2013, 09:57 PM

Quote:

Originally Posted by tilbrook@rbe.ne

Very good image of NGC 7424 Greg!

One thing that puzzles me, there seems to be no HA regions showing.

Cheers,

Justin.

Its very faint. I was happy that I got a half decent result.

Quote:

Originally Posted by RickS

Tough target, Greg! You got a decent result for the time but it's a galaxy that needs lots of data. HyperLeda gives a surface brightness of only 23.43 +/- 0.25 mag/arcsec^2.

They are there but also very dim. I had traces of them in my 18 hour Qld Astrofest image.

Cheers,
Rick.

Very true Rick. I was surprised at how dim it turned out even after 10 hours.

Greg.

allan gould · #5 02-12-2013, 11:14 PM

Über nice of a faint little devil.

gregbradley · #6 03-12-2013, 06:50 AM

Thanks Allan.

Greg.

jase (Jason) · #7 03-12-2013, 08:27 AM

Fantastic galaxy Greg. A barred spiral perhaps. Good to see some super distant objects coming from your set up. You should be pretty happy with that. Well done.

strongmanmike (Michael) · #8 03-12-2013, 01:44 PM

Love the image scale of your setup Greg, always looks so in your face

Of course this exposes the image, warts and all. Be nice to see more colour I guess but it is a pretty spiral...how many galaxies are there in the sky this time of year! ...they are eeeevery where

Mike

gregbradley · #9 03-12-2013, 04:43 PM

Quote:

Originally Posted by jase

Fantastic galaxy Greg. A barred spiral perhaps. Good to see some super distant objects coming from your set up. You should be pretty happy with that. Well done.

Thanks Jase. Thanks for the encouragement. I was hoping for more from 10 hours but as you say its a super distant object.

Quote:

Originally Posted by strongmanmike

Love the image scale of your setup Greg, always looks so in your face

Of course this exposes the image, warts and all. Be nice to see more colour I guess but it is a pretty spiral...how many galaxies are there in the sky this time of year! ...they are eeeevery where
Mike

I'm a in your face kind of guy! Thanks Mike. Signal to Noise ratio is not the strongest in this image and I was happy it came up as colourful as that as it didn't look that promising along the way!

Yes its a galaxy smorgasboard at the moment.

Greg.

Ross G · #10 04-12-2013, 10:11 PM

A great looking galaxy photo Greg.

Nice closeup.

Ross.

gregbradley · #11 05-12-2013, 08:06 AM

Thank Ross. I did not know it was that dim. But some of the nicer spirals in the southern hemisphere seem to be quite small and dim.

Greg.

Shiraz (Ray) · #12 05-12-2013, 09:05 AM

really good image of a difficult target Greg - nice colour and resolution.

gregbradley · #13 05-12-2013, 11:12 AM

Quote:

Originally Posted by Shiraz

really good image of a difficult target Greg - nice colour and resolution.

Thanks Ray.

Greg.

Paul Haese · #14 05-12-2013, 11:20 AM

Good detail Greg, do you use selective sharpening though? More saturation might be nice too. And; of course lots more time too. Nice round stars. Maybe an AO unit would work too.

gregbradley · #15 07-12-2013, 10:02 AM

Quote:

Originally Posted by Paul Haese

Good detail Greg, do you use selective sharpening though? More saturation might be nice too. And; of course lots more time too. Nice round stars. Maybe an AO unit would work too.

Thanks Paul. I think its at its limit. I was surprised I managed to get this much colour as it was quite a weak signal. I think from here the only thing would be more time. I do use selective sharpening but a weak signal does not take sharpening well so probably none or little used here.
It really is a dim galaxy.

The MMOAG and STi plus PEC and Pro Track do give nice round stars on this scope. 20 minutes is no problem. 30 minutes would be fine as well.

An AO unit would definitely be nice at this focal length. Its on the wish list.

Greg.