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Imaging telescopes or lenses: ASA - Astro Systeme Austria ASA 20" Astrograph
Imaging cameras: FLI Proline 16803
Mounts: ASA - Astro System Austria DDM85
Software: Pleiades Astrophoto PixInsight 1.8 Ripley · Photoshop
Filters: Astrodon 3nm Ha
Dates:Dec. 7, 2018 , Dec. 12, 2018 , Dec. 21, 2018
Frames:
Astrodon 3nm Ha: 14x1200" -30C bin 1x1
Astrodon LRGB Tru-Balance E-series Gen II: 36x300" -30C bin 2x2
Astrodon Luminance Tru-Balance E-Series Gen II Astrodon Luminance Tru-Balance E-Series Gen: 30x600" -30C bin 1x1
Integration: 12.7 hours
Darks: ~36
Flats: ~16
Bias: ~20
Avg. Moon age: 6.09 days
Avg. Moon phase: 40.36%
Bortle Dark-Sky Scale: 1.00
Astrometry.net job: 2453271
RA center: 7h 33' 39"
DEC center: -47° 8' 52"
Pixel scale: 0.947 arcsec/pixel
Orientation: 0.167 degrees
Field radius: 0.762 degrees
Resolution: 4096x4095
Data source: Amateur hosting facility
Remote source: ChileScope
Une image que je révais de faire depuis longtemps, car j'avais un poster de cet objet dans ma chambre étant enfant : CG4 !
Découverte en 1976 par l'Australian Astronomical Observatory, CG4 (Cometary Nebula 4) est une nébuleuse obscure située à 1300 années-lumière dans la constellation de la Poupe.
Elle fait partie d'un groupe de nébuleuses obscures d'aspects "cométaires", situés autour de la nébuleuse de Gum, et dont les "têtes" pointent toutes vers le rémanent de supernova des Voiles, au centre de la nébuleuse de Gum. Certains astronomes considèrent que ces globules de bok, initialement de forme sphérique, ont été déformés par l'onde de choc de la supernova.
La "tête" de la nébuleuse est éclairée par les jeunes étoiles nées en son centre et visibles sur l'image. La nébuleuse s'étend sur 8 années-lumière de long, sur 1,5 année-lumière de diamètre.
Certains appellent cette nébuleuse "la main de Dieu", mais personnellement j'y vois plutôt un immense "ver des sables" de la planète Arrakis, ou "Dune", bondissant pour avaler la petite galaxie ! :)
La galaxie en question, PGC 21338, est en réalité distante de plus de 100 millions d'années-lumière. La galaxie en bas de l'image, NGC2427, est quant à elle distante de 45 millions d'années-lumière.
-------------------------------------
An image I dreamed to make since a long time, because I had a poster of this object in my bedroom as a child: CG4!
Discovered in 1976 by the Australian Astronomical Observatory, CG4 (Cometary Nebula 4) is a dark nebula located 1300 light-years away in the constellation Puppis.
It is part of a group of dark nebulae with a cometary aspect, located around the Gum Nebula, all of them pointing away from the Vela supernova remnant, in the center of the Gum nebula. Some astronomers consider that these Bok globules, originally spherical in shape, have been deformed by the shock wave of the supernova.
The "head" of the nebula is illuminated by the young stars born in its center and visible in this image. The nebula extends 8 light-years long, 1.5 light-years in diameter.
Some call this nebula "the hand of God", but personally I see there rather an immense sandworm of Arrakis, aka "Dune", leaping to swallow the small galaxy! :)
The galaxy in question, PGC 21338, is actually more than 100 million LY away. The galaxy at the bottom of the image, NGC2427, is 45 million LY away.
JB
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