Ngc908

Geoff45 (Geoff) · #1 07-01-2015, 04:54 PM

Here is a seldom imaged galaxy--NGC908. It's not large--6' x 3', so I've cropped the real estate from 4096 x 4096 pixels down to 1960 x 1660 pixels.
http://www.astrobin.com/146460/
It is a starburst a galaxy undergoing a period of intense star formation. There are numerous clumps of bright stars in its spiral arms. Notice also the peculiar split in the spiral arm on the left (eastern) side of the galaxy. Both the intense star formation and the spiral arm split suggest that the galaxy has been disturbed by some other galaxy. However, no other galaxy is visible near NGC908. Possibly it may have been absorbed in the encounter, or it may be massive, but very faint, or it may be hidden behind NGC908.

Telescope: PlaneWave 12.5"CDK
Mount: AP900GTO
Camera: FLI Proline16803
Total exposure was 4.8 hours--an hour or so of R, G and B and somewhat more for L.
Geoff

strongmanmike (Michael) · #2 07-01-2015, 05:04 PM

Err ummm..apart from the decon remnants grrrr (god I go on!

) that's a really good galaxy image Geoff, really like the composition too

EDIT: had another longer look and meah.. forget my comment above, it jooks ok

Mike
(has a psycolomological problem with decon...decon...where is the decon

)

Geoff45 (Geoff) · #3 07-01-2015, 05:10 PM

Quote:

Originally Posted by strongmanmike

Err ummm..apart from the decon remnants grrrr (god I go on!

) that's a really good galaxy image Geoff, really like the composition too

Mike
(has a psycolomological problem with decon)

Yeah. I need to work a bit more on the decon so that it improves the image but stays backstage.

strongmanmike (Michael) · #4 07-01-2015, 05:13 PM

Quote:

Originally Posted by ghsmith45

Yeah. I need to work a bit more on the decon so that it improves the image but stays backstage.

Err, just edited my post after another look, mate it looks ok...I just do have an issue when I can see some evidence of decon..
Mike

gregbradley · #5 07-01-2015, 05:26 PM

Beautiful image Geoff and welcome to the FLI Proline 16803 club!

Greg.

RickS (Rick) · #6 07-01-2015, 05:56 PM

That's a lovely little galaxy and a great image, Geoff!

Cheers,
Rick.

clive milne · #7 07-01-2015, 06:16 PM

It's pleasing to see someone else taking images of moderately obscure galaxies .... and you've done a remarkably good job on this.
I for one, really like your processing.

best,

c

Geoff45 (Geoff) · #8 07-01-2015, 06:35 PM

Quote:

Originally Posted by gregbradley

Beautiful image Geoff and welcome to the FLI Proline 16803 club!

Greg.

Thanks Greg. I'm very pleased with the camera so far.

Quote:

Originally Posted by RickS

That's a lovely little galaxy and a great image, Geoff!

Cheers,
Rick.

Thanks Rick. Nice to get positive comments from the experts.

Quote:

Originally Posted by clive milne

It's pleasing to see someone else taking images of moderately obscure galaxies .... and you've done a remarkably good job on this.
I for one, really like your processing.

best,

c

Thanks Clive. Yes, I like to go off the beaten track at least once per session.

alpal · #9 07-01-2015, 06:49 PM

Hi Geoff,
Looks like a nice capture to me.
I wonder if you could get more detail out of it with 3 x drizzle used in stacking?

cheers
Allan

Placidus (Mike and Trish) · #10 07-01-2015, 08:09 PM

A truly beautiful photo Geoff. The colour in the galaxy is magnificent. Interesting background.

Quote:

Originally Posted by alpal

Hi Geoff, I wonder if you could get more detail out of it with 3 x drizzle used in stacking? cheers Allan

Always worth a try, but my guess is that this is already an adequately over-sampled image of a very small galaxy at long focal length, and is actually pretty darn sharp already.

Best,
Mike

Geoff45 (Geoff) · #11 07-01-2015, 08:34 PM

Quote:

Originally Posted by alpal

Hi Geoff,
Looks like a nice capture to me.
I wonder if you could get more detail out of it with 3 x drizzle used in stacking?

cheers
Allan

Thanks Allan. Drizzle needs lots of subs and I don't have enough. Also i'm quite oversampled, whereas to get a real advantage you need to be undersampled.
Geoff

Geoff45 (Geoff) · #12 07-01-2015, 08:37 PM

Quote:

Originally Posted by Placidus

A truly beautiful photo Geoff. The colour in the galaxy is magnificent. Interesting background

Best,
Mike

Thanks Mike. I fiddled quite a bit with the crop to get a good combo of galaxy and stars.
Geoff

Paul Haese · #13 07-01-2015, 08:46 PM

Quote:

Originally Posted by strongmanmike

Err, just edited my post after another look, mate it looks ok...I just do have an issue when I can see some evidence of decon..bit like Paul H's fixation on noise I guess?.. he could find some in an empty padded room

Mike

That is enough Mike. Please do not bag me again anywhere on this site again; your insults are not funny and you are in breach of the TOS. You are being a bully. Moderation I ask that you deal with this behaviour.

Paul Haese · #14 07-01-2015, 09:43 PM

BTW Geoff, I rather like this image. The colour is nice and the detail pleasing. There is a bit of a gradient in the background.

strongmanmike (Michael) · #15 07-01-2015, 10:04 PM

Quote:

Originally Posted by Paul Haese

That is enough Mike. Please do not bag me again anywhere on this site again; your insults are not funny and you are in breach of the TOS. You are being a bully. Moderation I ask that you deal with this behaviour.

Oh come'on it was clearly light hearted with no malice whatsoever, heck I was bagging myself for goodness sake!

Don't read so much into posts, sheesh, look at the funny side instead will ya?

Geoff45 (Geoff) · #16 07-01-2015, 10:23 PM

Quote:

Originally Posted by Paul Haese

BTW Geoff, I rather like this image. The colour is nice and the detail pleasing. There is a bit of a gradient in the background.

Thanks Paul. I'll have another look at the gradient.
Geoff

alpal · #17 07-01-2015, 11:01 PM

Quote:

Originally Posted by ghsmith45

Thanks Allan. Drizzle needs lots of subs and I don't have enough. Also i'm quite oversampled, whereas to get a real advantage you need to be undersampled.
Geoff

Mike,

Quote:

Always worth a try, but my guess is that this is already an adequately over-sampled image of a very small galaxy at long focal length, and is actually pretty darn sharp already.

Hi Geoff,
I know you are over sampled at 0.73 arc seconds per pixel -
but you might just get a bit extra -
especially when you zoom in on the image -
if you want to make a larger image out of the galaxy.
I'd try a re-stack just for the fun.

cheers
Allan

Geoff45 (Geoff) · #18 08-01-2015, 10:17 AM

Quote:

Originally Posted by Paul Haese

BTW Geoff, I rather like this image. The colour is nice and the detail pleasing. There is a bit of a gradient in the background.

Yep, the gradient is there on closer examination. It was easy to eliminate with PixInsight's DBE, although I haven't got around to updating the post

Quote:

Originally Posted by alpal

Hi Geoff,
I know you are over sampled at 0.73 arc seconds per pixel -
but you might just get a bit extra -
especially when you zoom in on the image -
if you want to make a larger image out of the galaxy.
I'd try a re-stack just for the fun.

cheers
Allan

I'll have a go at it Allan and see what turns out.

Ross G · #19 08-01-2015, 10:45 PM

A great looking galaxy photo Geoff.

I love the colour and detail.

Very nice composition.

Good luck with all the new equipment.

Ross.

Geoff45 (Geoff) · #20 09-01-2015, 06:17 AM

Quote:

Originally Posted by Ross G

A great looking galaxy photo Geoff.

I love the colour and detail.

Very nice composition.

Good luck with all the new equipment.

Ross.

Thanks Ross. BTW I like your website. I should set up something myself, but keep putting it off.
Geoff