Sh2-137 Cepheus Nebulosity IHO (Infrared-Halpha-OIII) image, ASI6200MM PRO, 9.1h integration time (selected from 12h in 3 nights), good to very good seeing (1.2"-1.5"). No moon. Celestron RASA36 790mm f/2.2 · IHO · ZWO ASI6200MM Pro (mono cooled) · 18h 12min (raw total) · 546 subs · Freyung Private Observatory, Germany · 21h 57m 12.0s / +64° 40' 59.9" · 2023-08-20
