Go Back   IceInSpace > Images > Deep Space
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 21-02-2017, 09:38 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Sharpless 2-240 in HaRGB

SH2-240 is a very large (approx 3x3 degrees) and dim supernova remnant on the Taurus/Auriga border.

We captured 63 hours of Ha data on this object back in late 2014/early 2015 at SRO (California) as a 3x3 mosaic with a FSQ106ED and QSI683 camera (2x2 binning). Unfortunately, we were too late to capture enough RGB to make a full colour image so I have been sitting on the data for a while. Then, in late 2016/early 2017 we captured 19 hours of Ha/R/G/B with a Rokinon 135mm f/2 lens at DSW (New Mexico) which included the original field of view. This is my first attempt to combine the data using the Rokinon wide field as a base. My next project is to make a high res version based on the SRO data with the DSW star colours.

DSW data capture details...

Scope: Rokinon 135mm f/2
Mount: Paramount ME
Camera: QSI583
Filters: Astrodon E-series Gen II LRGB, 5nm Ha
Image scale: 8.6 arcsec/pixel (drizzle to 4.3 arcsec/pixel)
Exposures: 24x300s R, 21x300s G, 27x300s B, 78x600s H (19 hours)

SRO data capture details...

Scope: FSQ-106ED
Mount: Paramount ME
Camera: QSI683
Filters: Astrodon 5nm Ha
Guiding: QSI OAG + Lodestar
Image scale: 4.19 arcsec/pixel
Exposures (3x3 mosaic):
A1: 16x1800s Ha
A2: 16x1800s Ha
A3: 13x1800s Ha
A4: 15x1800s Ha
A5: 07x1800s Ha
A6: 10x1800s Ha
A7: 19x1800s Ha
A8: 19x1800s Ha
A9: 11x1800s Ha

All image processing done in PixInsight. I'm still not sure if the result is just too red I'm having some colour management issues that are proving difficult to diagnose.

Higher res version at Astrobin: http://www.astrobin.com/full/284525/0/

Thanks for looking and for any constructive comments.

Cheers,
Rick.
Attached Thumbnails
Click for full-size image (SH2-240 LHaHaRGB_DSW_SRO_v3-sml-sRGB.jpg)
101.4 KB107 views
Reply With Quote
  #2  
Old 21-02-2017, 10:01 PM
h0ughy's Avatar
h0ughy (David)
Moderator

h0ughy is offline
 
Join Date: Apr 2005
Location: NEWCASTLE NSW Australia
Posts: 33,428
Reply With Quote
  #3  
Old 21-02-2017, 10:06 PM
alpal's Avatar
alpal
Registered User

alpal is offline
 
Join Date: Jan 2012
Location: Melbourne
Posts: 3,784
That's nice Rick,
I wonder why there is no step in the red channel on the histogram?
The Green & Blue look normal.

ie.
the Red starts at a level of 52
The Green & Blue start at 0 as they should & slowly climb upwards.
How did you stretch the data?

cheers
Allan
Reply With Quote
  #4  
Old 21-02-2017, 10:07 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
That is magnificent. Wonderful.
Reply With Quote
  #5  
Old 21-02-2017, 10:20 PM
Atmos's Avatar
Atmos (Colin)
Ultimate Noob

Atmos is offline
 
Join Date: Aug 2011
Location: Melbourne
Posts: 7,013
Very nice Rick! One object that has always fascinated me... It's HUGE!
Reply With Quote
  #6  
Old 21-02-2017, 10:21 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by h0ughy View Post
Thanks, Dave

Quote:
Originally Posted by alpal View Post
That's nice Rick,
I wonder why there is no step in the red channel on the histogram?
The Green & Blue look normal.

ie.
the Red starts at a level of 52
The Green & Blue start at 0 as they should & slowly climb upwards.
How did you stretch the data?

cheers
Allan
Not sure where that came from, Allan. It ended up being quite a complex process and a lot of tweaking happened. I suspect it was the NB/RGB combination but I'll step through the history and find out.

Quote:
Originally Posted by Placidus View Post
That is magnificent. Wonderful.
Thank you, M&T!
Reply With Quote
  #7  
Old 21-02-2017, 10:22 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by Atmos View Post
Very nice Rick! One object that has always fascinated me... It's HUGE!
Thanks, Colin. It certainly is a monster! About the same size as the Veil but much dimmer.
Reply With Quote
  #8  
Old 21-02-2017, 11:16 PM
strongmanmike's Avatar
strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,689
Great piece of work Rick and a lot of it by the sounds of it It's a magnificent object. Nice use of different data sets and mosaicing, a great view and I think this object looks good in red.

I can't wait to have my FSQ...waiting, waiting...

I think I have seen this nebula on television before too?

MIke
Reply With Quote
  #9  
Old 21-02-2017, 11:39 PM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 7,121
Just great Rick. I admire your perservance in building over years. Great dedication. Your storage capacity must be significant to support retention of all that (and other) data.

Last edited by glend; 22-02-2017 at 12:56 AM.
Reply With Quote
  #10  
Old 21-02-2017, 11:56 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 18,183
That's a stunner Rick. Gorgeous.

Greg.
Reply With Quote
  #11  
Old 22-02-2017, 01:44 AM
willik (Willik)
Registered User

willik is offline
 
Join Date: Nov 2009
Location: Perth WA
Posts: 717
That is a top shot a beut image Rick
Reply With Quote
  #12  
Old 22-02-2017, 10:06 AM
Andy01's Avatar
Andy01 (Andy)
My God it's full of stars

Andy01 is offline
 
Join Date: Mar 2012
Location: Melbourne
Posts: 3,279
Well done Rick!

Valiant and mighty data gathering and processing effort there Rick, big ups for patience & persistance.

Stunning object and high on my bucketlist to try to image one day.

I wonder though, when comparing it to other images of this on Astrobin, if it's appearing to lose detail because it's oversaturated & lacking contrast?

Just my 2c worth but I'm thinking (can't believe I'm saying this) a bit of tweaking would yield an even better result.

Disclaimer: Your image looks dramatically different when downloaded & viewed on my calibrated Hi Res monitor in Photoshop -which confirms my suspicions about Astrobin rendering images correctly.
Reply With Quote
  #13  
Old 22-02-2017, 10:09 AM
Camelopardalis's Avatar
Camelopardalis (Dunk)
Drifting from the pole

Camelopardalis is offline
 
Join Date: Feb 2013
Location: Brisbane
Posts: 5,478
Outstanding Rick the detail in the full-res version is (almost) unbelievable. Love all the faint faint nebulosity around the sides...must be really faint given the exposure time
Reply With Quote
  #14  
Old 22-02-2017, 10:43 AM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by strongmanmike View Post
Great piece of work Rick and a lot of it by the sounds of it It's a magnificent object. Nice use of different data sets and mosaicing, a great view and I think this object looks good in red.

I can't wait to have my FSQ...waiting, waiting...

I think I have seen this nebula on television before too?
Thanks, Mike! Very topical video #LastnightinSweden

Quote:
Originally Posted by glend View Post
Just great Rick. I admire your perservance in building over years. Great dedication. Your storage capacity must be significant to support retention of all that (and other) data.
Thanks, Glen. I keep all the lights and master calibration frames. It does take up a bit of space but you never know when they'll come in handy.

Quote:
Originally Posted by gregbradley View Post
That's a stunner Rick. Gorgeous.
Ta, Greg!

Quote:
Originally Posted by willik View Post
That is a top shot a beut image Rick
Thanks, Martin.

Quote:
Originally Posted by Andy01 View Post
Well done Rick!

Valiant and mighty data gathering and processing effort there Rick, big ups for patience & persistance.

Stunning object and high on my bucketlist to try to image one day.

I wonder though, when comparing it to other images of this on Astrobin, if it's appearing to lose detail because it's oversaturated & lacking contrast?

Just my 2c worth but I'm thinking (can't believe I'm saying this) a bit of tweaking would yield an even better result.

Disclaimer: Your image looks dramatically different when downloaded & viewed on my calibrated Hi Res monitor in Photoshop -which confirms my suspicions about Astrobin rendering images correctly.
Thanks, Andy. Yes, there is definitely something not right with Astrobin rendering. It used to strip ICC profiles but that's been fixed for a while. The problem could be browser related too. Colour management on the web is a bit of a crap shoot.

Quote:
Originally Posted by Camelopardalis View Post
Outstanding Rick the detail in the full-res version is (almost) unbelievable. Love all the faint faint nebulosity around the sides...must be really faint given the exposure time
Thanks, Dunk. Oh, it's faint all right
Reply With Quote
  #15  
Old 22-02-2017, 05:50 PM
ozstronomer's Avatar
ozstronomer (Geoff)
Registered User

ozstronomer is offline
 
Join Date: Jul 2007
Location: Brisbane
Posts: 965
Beautiful image Rick, great result.

Geoff
Reply With Quote
  #16  
Old 22-02-2017, 07:29 PM
Spookyer's Avatar
Spookyer (Brett)
Brett P

Spookyer is offline
 
Join Date: Jun 2013
Location: Dayboro
Posts: 580
Rick that is quite and epic effort, well done.

Brett
Reply With Quote
  #17  
Old 22-02-2017, 07:47 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by ozstronomer View Post
Beautiful image Rick, great result.
Thanks, Geoff!

Quote:
Originally Posted by Spookyer View Post
Rick that is quite and epic effort, well done.
Thanks, Brett. Not quite my longest integration time, but extra difficulty points for the 135mm/530mm focal length disparity
Reply With Quote
  #18  
Old 22-02-2017, 08:13 PM
batema's Avatar
batema (Mark)
Registered User

batema is offline
 
Join Date: Jul 2006
Location: Sunshine Coast
Posts: 1,829
Absolutely stunning Rick. Beautiful.

Mark
Reply With Quote
  #19  
Old 22-02-2017, 08:28 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Quote:
Originally Posted by alpal View Post
I wonder why there is no step in the red channel on the histogram?
The Green & Blue look normal.

ie.
the Red starts at a level of 52
The Green & Blue start at 0 as they should & slowly climb upwards.
How did you stretch the data?
Allan: the red histogram is normal until I combine the luminance with the colour data and then the bottom of the red histogram kicks up a little. The area affected is just some speckles of background at the top left edge. Fixing the data makes no visible difference so I'm not going to worry about it

Quote:
Originally Posted by batema View Post
Absolutely stunning Rick. Beautiful.
Thanks, Mark.
Reply With Quote
  #20  
Old 23-02-2017, 12:08 AM
alpal's Avatar
alpal
Registered User

alpal is offline
 
Join Date: Jan 2012
Location: Melbourne
Posts: 3,784
Quote:
Originally Posted by RickS View Post
Allan: the red histogram is normal until I combine the luminance with the colour data and then the bottom of the red histogram kicks up a little. The area affected is just some speckles of background at the top left edge. Fixing the data makes no visible difference so I'm not going to worry about it


Fair enough Rick,
It just looked strange on the histogram.
Normally on pictures you always leave a bit of room at the bottom end.
That also helps when converting to LAB mode if you need to adjust the tones with 4 colours to work with.

cheers
Allan
Reply With Quote
Reply

Bookmarks


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 02:11 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement