SUNSET: 
0
Photographer:
massimo.difusco
Location of Photo:
Ferrara (Italy)
Date/Time of photo:
06/08/2023 00:00
Equipment:
Telescope Sky-Watcher Evostar ED80 @480mm (f/6.0), Qhy168c camera @-5 °C, Sky-Watcher Eq6r Pro mount, Optolong L_Ultimate filter, SvBony UV/IR-cut filter
Description:
After 3 years of trying, I managed to bring home this very faint nebula in the constellation Cassiopeia, a supernova remnant cataloged as CTB1 (Caltech Observatory list B catalogue of radio sources). When discovered in 1955, CTB1 was thought to be a planetary nebula, so Abell included it in his catalog of planetary nebulae as Abell 85. Further research in 1971 showed that CTB1 is, instead, a supernova remnant 10000 light-years away from us with a diameter of about 100 light years. CTB1 is a very challenging object to photograph, as it is quite faint. Without the use of filters, in fact, it is practically invisible. In this regard, I believe that the L_Ultimate filter made the difference in this case, since it was a subject at the limit of feasibility from my city sky that I tried to shoot several times with the Newton without particular success. A curiosity that I came across by chance doing a bit of research on the web: this nebula is also known by the common name of Garlic Nebula and I found a 2015 image on Astrobin (here the link: https: //www.astrobin.com/208841/C/) where the author literally declares "I couldn't find a common name for it, so I'm calling it for what I see - a head of Garlic". I really believe that this is the origin of its bizarre name. Sky-Watcher Evostar ED80 @480mm, f/6 Qhy168c @-5 °C Sky-Watcher Eq6r Pro mount Optolong L_Ultimate filter 105x600" SvBony UV/IR-cut filter 40x60" N.I.N.A., APP, PixInsight, PS Ferrara (Italy)
