Abell21 Medusa nebula
10.2mag 12*8'
2020.Dec.06 etc. C14 35cmF11+reducer F7 ZWO ASI294MC 10sec*1586, ASI294MM-Pro IDAS NB1 filter 10sec*1923, Baader Planetarium RGB filter 10sec*390, 328, 349 total 762min
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