Sh2-174, also known as the Valentine Nebula, is a faint emission nebula in the constellation of Cassiopeia. This image is the result of a collaboration between me and my friend Andrea Arbizzi. By combining two independent datasets acquired under different skies with different telescopes, we reached a total integration time of 51h 15m, revealing the faint outer structures of this beautiful nebula.

Sky-Watcher Quattro 200P 200/800 f/4 + ZWO ASI2600MC Air
Celestron EdgeHD 8" @ f/7.3 + Tecnosky APO Doublet 125 f/5.1 + ZWO ASI533MC Pro
Sky-Watcher HEQ5 + iOptron GEM45
Optolong L-Ultimate 3 nm: 201 × 300s
ZWO UV/IR Cut: 300 × 20s
Optolong L-eXtreme: 88 × 600s
SVBONY SV220: 109 × 600s
Corridonia, Italy (Bortle 6, SQM 19.3–19.5) + Modena, Italy (Bortle 7.5–8, SQM 18.5–18.8) , July 2026

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Daten zum Bild