I present to you an exotic object that was initially discovered as a planetary nebula but was requalified as a supernova afterglow that occurred over 7,500 years ago.
Located about 10,000 light years from home towards the Cassiopeia constellation, these are the filamentary remnants of a supernova that have a shell shape, part of which is doubly ionized oxygen (in blue) while the rest (in red) is essentially ionized hydrogen.
Technical details :
– Apo Takahashi FSQ 85 at F/D 5.3
– iOptron 60 cem ec mount
– Asi 2600 mm pro
– 6nm astronomik filters
– Acquisition sampling: 1.7 arcsec
– 92 x 600s HA i.e. 15 h 20 min
– 181 x 600s O3 i.e. 30 h 10 min
– 3 x 30 x 60s RGB i.e. 1 h 30 min
– Total integration: 47 h
– DOF: 31/149/25
– Date: August 2021
– Location: HAO4 observatory of Oukaimeden, Morocco.
