Hemisphere:  Southern  ·  Constellation: Puppis (Pup)  ·  Contains:  Extremely wide field
Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII), 



    
        

            Mladen_Dugec
Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII)
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Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII)

Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII), 



    
        

            Mladen_Dugec
Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII)
Powered byPixInsight

Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII)

Technical card

Imaging telescopes or lenses: Sigma 18-35 f/1.8

Imaging cameras: Pentax K-01

Mounts: iOptron SkyTracker Pro

Software: Starnet ++  ·  Dynamic Photo HDR-4  ·  Photoshop CS6  ·  Astro Pixel Processor by Aries Astro Pixel Processor APP 1.074.1

Filters: STC Astro Duo-Narrowband filter


Dates:Feb. 6, 2020

Frames: 145x300" (12h 5')

Integration: 12h 5'

Avg. Moon age: 11.68 days

Avg. Moon phase: 89.63%


Basic astrometry details

Astrometry.net job: 3238698

RA center: 8h 18' 27"

DEC center: -39° 56' 34"

Pixel scale: 28.643 arcsec/pixel

Orientation: 135.261 degrees

Field radius: 28.418 degrees


Resolution: 4912x5188

Data source: Backyard

Description

f3.5, 35mm, iso 800, 145x300sec, 30 flats, 30 flat darks, 30 bias, 30 darks

Spanning some 41 x 46 degrees, it’s hard to convey the scale of the Gum12a and 12b (12b being the brighter portion of the lower right arc).

This vast cloud of ionised hydrogen straddles the southern sky's Milky way between the constellations Puppis and Carina.

Imaged here in bicolour, using an STC Astro Duoband filter (Ha and OIII) on an astromodified mirrorless camera

The entire Vela supernova remnant is just to the right of centre (and a very tiny Pencil Nebula can be seen).

To try to illustrate the apparent angular diameter of Gum 12a and 12b, I’ve included a second, composited image, containing the gibbous moon shot with the same system and focal length on the same night.

Comments

Revisions

  • Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII), 



    
        

            Mladen_Dugec
    Original
  • Final
    Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII), 



    
        

            Mladen_Dugec
    B

B

Description: Gibbous moon for apparent diameter comparison

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Sky plot

Sky plot

Histogram

Gum 12a and 12b 2 panel mosaic in bicolour (Ha and OIII), 



    
        

            Mladen_Dugec