NGC 3576+3603 (stage 1 out of 3)

[Slawomir]

Hi all,

It is a great feeling to be imaging again... :)

Sharing initial data from my new project, twenty 10-minute subs in Ha. Awaiting clear skies to add more Ha data and also S2 and O3. Minimal processing - a touch TGV denoise followed by a subtle Local Histogram Equalisation on the brighter areas and finished with the Dark Structure Enhance script.

High Res: http://www.astrobin.com/full/243134/0/
Full Res: http://www.astrobin.com/full/243134/0/?real=&mod=

Thank you for looking.

Suavi

EDIT: More data added (7.5 hrs of Ha in total)

High resolution: http://www.astrobin.com/full/243134/B/

Full resolution: http://www.astrobin.com/full/243134/B/?real=&mod=

[Placidus]

You did that with a 4" scope in just over 3 hours under full moon! Wow, we're amazed on all three counts. Wonderful.

The unusual orientation casts it in a different light.

Can't wait to see the NB tri-colour version.

[strongmanmike]

Well...hmmm? Nota bada at alla mio amico :eyepop:

But it is upside down :doh:

[rustigsmed]

Looking great suavi, only 10 min subs too!

Russ

[Andy01]

Very nice Suavi - er, Don't take this the wrong way but either she's upside down or I'm standing on my head!
Great details there. I'm hoping for a clear moonless night to finish mine off soon as well :)

[Slawomir]

Thank you Mike & Trish, it was your image that instantly inspired me to have a go at this object :)

My next upgrades will hopefully be moving out out the city and getting a quality mount.



Muchos Nachos Miguel :)

Upside down? Well, I was always considered a black sheep in my family...



Thank you Russell, I would like to do 15-minute subs but it is quite tricky to consistently get accurate polar alignment with the narrow slice of the sky I have unobstructed...field rotation is already noticeable in the bottom right corner..



Thanks Andy :hi:

I may flip the final image by 180 deg - I definitely do not want to give anyone a headache :lol:

[el_draco]

Unt sinze ven is dair ein upsi unt downsi in space? hmmm.... :P

[gregbradley]

Stunning. So sharp. A great field of view there.

Greg.

[Slawomir]

Thank you Greg :hi:

[Ryderscope]

A great image Suavi, which ever way you look at it :-)

[multiweb]

Superb! :thumbsup:

[marc4darkskies]

Excellent start! Great detail and beautiful tonal quality. Even when I'm standing on my head! ;)

Cheers, Marcus

[rustigsmed]

from that angle it is more like someone doing the one arm superman into a swimming pool.

[Slawomir]

Thank you Rodney, Marc, Marcus and Russell :)

Last night I managed to capture more data and did a quick comparison as for the amount of detail gained with longer integration.

The attached image shows, from left to right, auto-stretched area in a single 10-minute sub, stack of 20 subs and 45 subs. St. dev was respectively 36.8, 8.8 and 6.7. Clearly more faint stuff shows up with longer integration.

I think now I have sufficient Ha data, so time to move onto capturing O3 and S2 data.

Thank you all for your encouragement.

Suavi

[deeplook]

Hi Suavi,

really nice - sharp and great picture detail!

Markus

[Atmos]

A fair bit of faint stuff in there Sauvi, well done :) You can certainly see the difference that more integration time makes to an image. Quite amazing the difference between the single and the 45x :)

[Decimus]

Absolutely sharp and beautiful image, Suavi. I just had a look at your photography on Astrobin - so compelling and captivating. Thanks for sharing these great views of the deep sky. :)

Cheers,
Richard

[Slawomir]

Glad you like it Markus :)



Thank you Colin. Yeah - there does not seem to be much happening in this area in a single sub LOL

I have just uploaded a new image with added data to Astrobin.

High resolution: http://www.astrobin.com/full/243134/B/

Full resolution: http://www.astrobin.com/full/243134/B/?real=&mod=


Also, I started collecting O3 data this evening, but unfortunately clouds rolled in...



Thank you Richard for your kind feedback :)

[Slawomir]

Got first few O3 subs. Nice to see more detail showing up as integration time increases. On the right is a crop from a sigle auto-stretched 10-minute O3 sub, while on the left is a stack of five of them. Clearly, I will need heaps more...

Thank you for looking :)

[Flugel88]

Wow its intersting to see how the detail builds up in your OIII.
Are you going to be going for a typical hubble palette blend?
The HA is looking very nice and detailed so far.

[codemonkey]

Looking good Suavi (but what's new?)! Thanks for sharing the integration comparisons, that demonstrates really well how detail becomes more apparent with more subs, rather than just cleaning up existing detail.

[Slawomir]

Glad you like the Ha image Michael.

As for the palette, honestly, I have no idea at this stage. Once I get enough data I usually experiment with different palettes including blending together 2 different RGB images (from narrowband data) in various ratios until I am happy with the final result. For example, this image resulted from blending a bicolour Ha-O3 version with a tri-colour one: http://www.astrobin.com/full/233037/G/



Thanks Lee!

Yeah, through a bit of experimentation and by falling into many pitfalls I eventually discovered for myself what's really a common knowledge; a decent image starts with decent data :)

[Geoff45]

Great image Suavi. Nice wide field and lots of crisp detail.
Geoff

[RickS]

The Ha looks very impressive, Suavi! I may be in the minority, but I quite liked the original orientation :D

Cheers,
Rick.

[Slawomir]

Thank you Geoff. Hopefully colour version will turn out alright...



Thank you Rick. I may yet rotate it a few times before the final version in colour will crystallise :lol: But will need to get much more data first...

Last night managed to get a few more O3 frames...and did a quick check on how things are shaping up...definitely need more data. The screen shot shows 190 minutes vs 50 minutes vs 10 minutes of integration (for O3 filter).

Clear skies
Suavi

[rustigsmed]

I really like seeing the differences in stacks thanks for posting that. :thumbsup: