Go Back   IceInSpace > Images > Deep Space

Reply
 
Thread Tools Rate Thread
  #1  
Old 08-10-2023, 12:15 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
The Helix Halo

Hi everyone,

Located 655 lightyears away in Aquarius is the famous Helix nebula. The Helix nebula is one of the most extensively studied and imaged planetary nebula, and has a number of very interesting structures, including small central cometary knots, large-scale emission arcs, and a bipolar outflow causing bow-shaped filaments and shocks.

When planning this project, I came across a paper by Zhang et al discussing a possible halo around the Helix nebula. On Galex UV images, they detected a very faint possible NE jet, a SW bow shaped filament and a diffuse Southern Halo. I decided to take a deep image of the Helix to see if I could detect these infrequently seen features in Ha emission. I had also noticed on some images, faint OIII emission occurring around the NE and SW arcís and wanted to see if I could clearly define this OIII emission.

https://www.iceinspace.com.au/forum/...1&d=1696731123
Helix Halo features in IR and NIV from Zhang et al, The Astrophysical Journal

Data was captured with my Nikon 400mm f/2.8 including all of the nebulosity data seen here, but I did add some of the brighter stars from some data I had from my APM LZOS refractor. I used drizzle integration, and the outer faint halo was processed using continuum subtraction and carefully masked to not blow out the brighter inner ring.

https://www.iceinspace.com.au/forum/...1&d=1696731123
Astrobin: https://www.astrobin.com/h8hnt0/0/

Cheers,
Mat

Technical
Nikkor AF-S 400mm f/2.8E FL ED VR
ZWO ASI6200MM Pro
10Micron GM1000 HPS
Chroma Filters
Location: Dunedin NZ
Integration: 84h 30′
Attached Thumbnails
Click for full-size image (Helix_RGBHO_sm.jpg)
139.0 KB211 views
Click for full-size image (Zhang_Halo sm.jpg)
89.7 KB79 views
Reply With Quote
  #2  
Old 08-10-2023, 01:01 PM
joshman's Avatar
joshman (Josh)
Registered User

joshman is offline
 
Join Date: Aug 2007
Location: Coffs Harbour, Australia
Posts: 605
That's is a phenomenal image, and an amazing comparison with the Scientific image. Not to mention the amazing processing you've accomplished. I've just done some rudimentary math, and I would need to capture nearly 650 hours with my setup to have the equivalent SNR.


An incredible result all round!
Reply With Quote
  #3  
Old 08-10-2023, 02:09 PM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,844
Yep a lot of good data makes for a great image
Reply With Quote
  #4  
Old 08-10-2023, 05:23 PM
strongmanmike's Avatar
strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,119
Beautiful result Mat, another worthwhile project, nicely delineated Ha and OIII details too Maaaybe some colour in the stars might look good.. ?..meah, just a suggestion, you have probably already tried

Like the Dumbbell nebula in Vulpecular, it's amazing how many images are going super deep on the Helix these days too , not so long ago, if you picked up the main "eyebrow" well, you were bloomin well cheerin!

Well done indeed

Question, was that done with the lens wide open at F2.8?

Mike
Reply With Quote
  #5  
Old 08-10-2023, 05:41 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by joshman View Post
That's is a phenomenal image, and an amazing comparison with the Scientific image. Not to mention the amazing processing you've accomplished. I've just done some rudimentary math, and I would need to capture nearly 650 hours with my setup to have the equivalent SNR.


An incredible result all round!
Thanks Josh! The Nikon is fairly unique in having a decent aperture for the focal length (in refractor terms at least) so it does help to hoover up the photons
Reply With Quote
  #6  
Old 08-10-2023, 05:41 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by TrevorW View Post
Yep a lot of good data makes for a great image
Thanks Trevor!
Reply With Quote
  #7  
Old 08-10-2023, 06:01 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by strongmanmike View Post
Beautiful result Mat, another worthwhile project, nicely delineated Ha and OIII details too Maaaybe some colour in the stars might look good.. ?..meah, just a suggestion, you have probably already tried

Like the Dumbbell nebula in Vulpecular, it's amazing how many images are going super deep on the Helix these days too , not so long ago, if you picked up the main "eyebrow" well, you were bloomin well cheerin!

Well done indeed

Question, was that done with the lens wide open at F2.8?

Mike
Many thanks Mike! That’s a good suggestion, I’ll have another look and see if I can boost the star saturation

I use a small 3D printed aperture mask on the lens so it is operating at f/3, which I found tightened the stars a little and with the 5nm filters I wasn’t really losing any significant speed

CS, Mat
Reply With Quote
  #8  
Old 09-10-2023, 09:30 AM
Dave882 (David)
Registered User

Dave882 is online now
 
Join Date: Nov 2020
Location: PADSTOW
Posts: 1,967
Wow thatís stunning. The depth and subtle detail is just magnificent. Interesting write-up too thanks for sharing!!
Reply With Quote
  #9  
Old 09-10-2023, 01:20 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 17,859
A magnificent Helix Mathew.
Gee that Nikon lens is good but also very pricey- one I saw on ebay was AUD$6,600 or so.

Greg
Reply With Quote
  #10  
Old 09-10-2023, 02:46 PM
Peter Ward's Avatar
Peter Ward
Galaxy hitchhiking guide

Peter Ward is offline
 
Join Date: Dec 2007
Location: The Shire
Posts: 8,073
I really like the depth and in particular, colour of this image.

Though I'd also have to observe the overall resolution is a little soft....
e.g. the faint shock-front arcs you've done well to capture have
subtly blurred edges rather than the hard delineation larger instruments typically render.

That said, this is still a benchmark result many would struggle to emulate.

Nice one
Reply With Quote
  #11  
Old 09-10-2023, 03:07 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by Dave882 View Post
Wow thatís stunning. The depth and subtle detail is just magnificent. Interesting write-up too thanks for sharing!!
Thanks David, much appreciated.
Reply With Quote
  #12  
Old 09-10-2023, 03:12 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by gregbradley View Post
A magnificent Helix Mathew.
Gee that Nikon lens is good but also very pricey- one I saw on ebay was AUD$6,600 or so.

Greg
Thanks Greg! It’s not an inexpensive lens for sure but considering it’s a 143mm fluorite apo with a built in reducer it’s used price compares well to the current prices of FSQ106 with reducer (if you can even get one!) or other faster refractors. Of course you have to deal with external lens focusing and the lens mount but there are some good solutions for this. Cheers, Mat

Last edited by matlud; 09-10-2023 at 03:24 PM.
Reply With Quote
  #13  
Old 09-10-2023, 03:16 PM
strongmanmike's Avatar
strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,119
Quote:
Originally Posted by matlud View Post
I use a small 3D printed aperture mask on the lens so it is operating at f/3, which I found tightened the stars a little and with the 5nm filters I wasn’t really losing any significant speed

CS, Mat
Ah yes, this sounds familiar, I think I may have asked the same question previously ..oops forgot

I'd love one ... but at around $7K huh?...that ain't happening anytime soon, I'd need a new camera too with small pixels and a decent real estate size

Look forward to seeing more

Mike
Reply With Quote
  #14  
Old 09-10-2023, 03:24 PM
matlud (Mathew)
Registered User

matlud is offline
 
Join Date: Jun 2015
Location: NZ
Posts: 248
Quote:
Originally Posted by Peter Ward View Post
I really like the depth and in particular, colour of this image.

Though I'd also have to observe the overall resolution is a little soft....
e.g. the faint shock-front arcs you've done well to capture have
subtly blurred edges rather than the hard delineation larger instruments typically render.

That said, this is still a benchmark result many would struggle to emulate.

Nice one
Thanks Peter, appreciate the feedback. I think the outer arc softness you notice comes somewhat from being undersampled at 1.97”/pixel, the smaller aperture compared to the big guns, but mostly the noise reduction given how extremely faint the outer arcs are. Overall I was very happy with the detail the lens captured given the sampling/focal length and the drizzle integration really helped with the under sampling.

I have pondered getting something around 12” aperture in the future to see what I can get from my skies for smaller objects, but there seems to be slim pickings these days for higher end optics around the 12” range, other than planewave CDKs

CS, Mat

Last edited by matlud; 09-10-2023 at 04:09 PM.
Reply With Quote
  #15  
Old 09-10-2023, 04:43 PM
Peter Ward's Avatar
Peter Ward
Galaxy hitchhiking guide

Peter Ward is offline
 
Join Date: Dec 2007
Location: The Shire
Posts: 8,073
Quote:
Originally Posted by matlud View Post
Thanks Peter, appreciate the feedback. I think the outer arc softness you notice comes somewhat from being undersampled at 1.97Ē/pixel, the smaller aperture compared to the big guns, but mostly the noise reduction given how extremely faint the outer arcs are. Overall I was very happy with the detail the lens captured given the sampling/focal length and the drizzle integration really helped with the under sampling.

I have pondered getting something around 12Ē aperture in the future to see what I can get from my skies for smaller objects, but there seems to be slim pickings these days for higher end optics around the 12Ē range, other than planewave CDKs

CS, Mat
I can see your dilemma, a quest for resolution also usually involves the added cost of quality gear, and in a 12" aperture this has gone through the roof of late....I'd also concur that a Planewave CDK would be hard to go past in terms of bang for buck in that category.
Reply With Quote
  #16  
Old 09-10-2023, 06:35 PM
Kuz's Avatar
Kuz
Registered User

Kuz is offline
 
Join Date: Jun 2019
Location: Gladstone QUEENSLAND
Posts: 397
Well done Matt, as Peter mentioned bench mark image
Reply With Quote
  #17  
Old 14-10-2023, 02:02 PM
Addos (Adam)
Registered User

Addos is offline
 
Join Date: Apr 2021
Location: Brisbane
Posts: 291
Thats a quality capture there Matt, great definition in the often missed fainter regions surrounding. I hope you keep adding to this dataset in future years!
Reply With Quote
  #18  
Old 30-10-2023, 09:23 AM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,932
Good depth in the image Matthew. The outer shells are well seen and processed.
Reply With Quote
  #19  
Old 10-11-2023, 04:28 PM
Eis
Registered User

Eis is offline
 
Join Date: Apr 2020
Location: Sydney
Posts: 2
This is inspiring. How do you look for papers?
Reply With Quote
  #20  
Old 12-11-2023, 10:07 AM
JA
.....

JA is offline
 
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 2,918
Well done Mat, that's a wonderful image

... especially when one considers (I had to check it out) that it's an ~20% crop of what the full-frame sensor saw through the 400mm focal length lens. Amazing.

Best
JA
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 08:06 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement
Astronomy and Electronics Centre
Advertisement
Advertisement