Abell39
12.9mag 170"
2021.Apr.12 etc. C14 35cmF11+reducer F7 ZWO ASI294MM-Pro(Room Temp.), L: 5sec*79 + IDAS NB1 filter 10sec*1218, RGB: Baader Planetarium RGB filter 10sec*305, 259, 294 total 352.5min
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