I redid these two galaxies over the last few nights to see how faint I could go with these galaxies. They both have very faint extentions that are difficult to resolve being 4.5Km form the CBD of BrisVegas.
I did 20 min subs with the QSI583WSG and 10" GSO RC and I found that the dome really helps reduce light pollution from my neighbours properties.
NGC1672 has particularly faint arms but I was pleased to see them in the final image. I have found that the light pollution really messes up the colour frames which are a real horror to process so I have left them for when I get to a dark site.
Last edited by allan gould; 08-12-2013 at 12:46 AM.
Rick, Michael, Greg, Ross, Geoff, Ray and Jeanette.
Thanks so much for the kind comments. Much appreciated.
Ive been trying to get a few galaxies at the moment as Ive been inactive for quite a while, but finding that exposure times are limited being so close to Brisbane. I figure that the best I can do is 20-30min subs with the light pollution to just get some of the faint stuff around these galaxies. So I guess I wont be after any "jets".
I managed to get 120min in 20 min subs of NGC1055 just before the high altitude cloud came in last night. It was enough to show that this is a pretty side on galaxy but I then realized that M77 was just next door and that with the AP67 reducer I can get both in the same field of view. So I will be saving that for Friday (?) night.
Ive attached a small image of NGC1055 for what Ive got so far.
Comments welcomed.
Allan
Last edited by allan gould; 05-12-2013 at 02:35 PM.
Rick, you are correct.
NGC1068 is M77 which I mean to image along with NGC1055.
Silly mistake and I have corrected it above.
Thanks for pointing this out.
Allan
Great going Allan. I'm also very surprised at the faint arm detail you've brought out in some of those. Must be satisfying to have the observatory paying dividends like this.
Thanks for the comments, Rob. Ive found that I have to do 20 min subs here to even have a hope of registering some of the faint nebulosity. When I was at Astrofest I started out doing my usual 5min subs and then gradually increased that to 60 min subs. I found that with the latter the signal to noise ratio was so low that no darks etc were necessary for processing.
I was amazed that Rolf did 5 min subs to get this 120hr+ image of NGC5128. I thought that had hit the law of diminishing returns but he proved me wrong.
The observatory really works at keeping neighbours light to a low intrusion as well as any wind but I would love to image these galaxies at a dark site with long subs. But then I'd want a better scope and mount etc etc etc.
Allan
