20  March  2018
Thor's Helmet in Narrowband

By Alistair Samson

  O3 - 8 x 30mins
 Ha - 21 x 20mins
 7hrs of ha and 4 hrs of O3 mapped to LRGB as HaHaO3O3
 10-inch F4 home-made Newtonian
 SBIG STF8300m
 Paramount MyT
 Astrodon Ha, O3 filters
 Taken from suburban Melbourne, Australia


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