Getting plate-solving status, please wait...
The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson

The Dumbbell Nebula - close up

Getting plate-solving status, please wait...
The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson

The Dumbbell Nebula - close up

Equipment

Imaging Telescopes Or Lenses
The Liverpool Telescope
Imaging Cameras
IO:O

Acquisition details

Frames:
149x90" (3h 43' 30")
Integration:
3h 43' 30"

Basic astrometry details

Astrometry.net job: 1553319

Resolution: 1986x1949

Locations: Observatorio del Roque de los Muchachos, La Palma, Canary Islands, Spain

Data source: Professional, scientific grade data

Description

The Liverpool Telescope is a 2 m f/10 RC scope on La Palma, Canary Islands, that gives away their subs for free once the astronomers are done with them. A great way of keeping up the processing skills for Swedes while waiting for dark nights to come back in September.

Of all the Liverpool Telescope data I have processed, this was possibly the best, and I think the final result shows some stunning detail in this nebula. In my humble opinion it is as good as, or maybe even better, than images I have seen from much larger scopes, including the 8.2 m Subaru Telescope (Hubble has only imaged a small detail of it).

For this image I used subs from five filters (60, 90 and 120 s exposures, average ca 90 s) taken during 2015-2016. After throwing out subs with eggy stars or poor focus (about 30% of my downloads - LT appears to save everything), I ended up with these:

sdss-r 38 x 90 s (red data)

Ha 15 x 90 s (33 % mixed with 67 % sdss-r for the red channel)

Bessell B 43 x 90 s (mainly blue data)

sdss-g 20 x 90 s (mainly blue data, 33 % mixed with Bessell-B for the blue channel)

Bessell V 33 x 90 s (used for the green channel)

So totally 149 x 90 s or 3.7 hours

The camera is a 6 x 6 cm (15 µm pixels) 18 Mpix CCD camera (2x2 bin) of the brand e2v, which I think is chilled to -100°C.

Stacking in Nebulosity 4 and processing in PS CS5. The data was so clean that I did not apply any noise reduction but I did some very mild sharpening (deconvolution) using the Focus Magic filter for PS.

Any comments and suggestions most welcome, and for once I also invite pixel peepers!

PS. In the last version I used APF-R processing to further enhance the image

See http://www.cedic.at/apfr/

Comments

Revisions

    The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson
    Original
    The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson
    B
    The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson
    C
    The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson
    D
  • Final
    The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson
    E

Histogram

The Dumbbell Nebula - close up, 



    
        

            Göran Nilsson