SUNSET: 
0
Photographer:
massimo.difusco
Location of Photo:
Italy
Date/Time of photo:
10/10/2023 00:00
Equipment:
Sky-Watcher Evostar 80ED @480mm (f/6.0), Askar FRA600 (f/5.6), Player One Poseidon-C camera @-5 °C, QHY268M camera @-5 °C, Sky-Watcher Eq6r and AzEq6r Pro mounts, Optolong L_Ultimate filter, SvBony H-alpha 7nm filter, Optolong H-alpha 3nm filter, Optolong OIII 6.5nm filter, SvBony UV/IR-cut filter, SvBony RGB filters
Description:
The subjects imaged are located in the constellation Cassiopeia, just above the Heart Nebula, and are cataloged with the acronyms Abell 6 (in the center) and HFG1 (further to the right and lower). HFG1 (Heckathorn-Fesen-Gull 1) and Abell 6 make for an interesting pair of planetary nebulae (PN). Abell 6 has the bubble look of most PNs and it remains quite faint (Mag = 15). It has a blue look from ionization of OIII and has also a fairly strong Ha component as well. Discovered in 1982, HFG1 (PK 136+05) has a more complex structure: it presents an arc of a circle opposite the tail, in the direction of movement of the nebula, which suggests that it is a shock wave front of matter interacting with the interstellar medium. The planetary nebula is formed from a binary system comprised of a white dwarf and a large red giant star. The two stars are very close and rotate about each other in just 14 hours.
