HFG1 was discovered in the Milky Way Emission Line Study in 1982 by Heckathorn, Fesen and Gull. It is defined as a type F planetary nebula by Tweedy and Kitter, meaning that is appears to be uniformly filled.
HFG1 (lower left) was created by the central star V664 Cas. This is not a single star, but a dense binary star system consisting of a white dwarf and a sun-like star, which are only a few million kilometres apart and orbit every 14 hours.
Because the binary system V664 Cas moves very fast (at 29 to 59 kilometres per second) and ploughs through the interstellar medium together with the nebula, a bluish arc shock occurs.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120i
Mounts: Takahashi EM 400 Temma 2
Guiding cameras: QHY CCD QHY 5 II
Software: PHD 2, Astro Pixel Processer, PixInsight , Sequence Generator Pro SGP
Filters: Astrodon R,G,B, OIII (5nm) & Ha (5nm)

Dates: Dec. 28 – Jan. 11, 2021
Astrodon Ha 5nm: 60×1200″
Astrodon OIII 5nm: 60×1200″
Astrodon RGB: 3x20x120″
Integration: 43 Hours

Autore: Brendan Kinch (sito)