Abell 39

About image 

Ghostly in appearance, Abell 39 is a remarkably simple, spherical nebula about five light-years across. 

Well within our own Milky Way galaxy, the cosmic sphere is roughly 7,000 light-years distant toward the constellation Hercules. 

Abell 39 is a planetary nebula, formed as a once sun-like star's outer atmosphere was expelled over a period of thousands of years. Still visible, the nebula's central star is evolving into a hot white dwarf. Although faint, the nebula's simple geometry has proven to be a boon to astronomers exploring the chemical abundances and life cycles of stars. In this image recorded under dark skies, very distant background galaxies can be found - some visible right through the nebula itself.

(text adapted from APOD)

Technical data
Optic         GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount       10Micron GM2000 HPSII
Camera        ZWO ASI 2600 MM Pro with filter wheel 7 positions
Filters        Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB and OIII 5nm  
Guiding system   ZWO OAG-L with guide camera ASI 174MM
Exposure details    R 24x300" bin3 -15C, gain 100

                                    G 23x300" bin3 -15C, gain 100
          B 23x300" bin3 -15C, gain 100

          OIII 40x600" bin3 -15C, gain 100
Total integration  12h30'
Acquisition      Voyager, PHD2
Processing      Pixinsight 1.8, Photoshop CS5, StarXTerminator, NoiseXTerminator, BlurXTerminator
SQM-L       21.00   
Location       Promiod (Aosta Valley, Italy), own remote observatory
Date           10/11/12 February, 19/26 April, 26 May 2023


© Roberto Marinoni 2019 - All rights reserved