Sh2-155 The cosmic cave in HaRGB

This is the Cave Nebula (Sh2-155), a dim emission nebula situated 2,400 light-years away in the constellation Cepheus. Characterized by its dark lane of interstellar dust that forms a cave-like illusion, this active stellar nursery is a popular target for long-exposure deep-sky astrophotography. I photographed this nebula with specialized astrophotography gear over several nights resulting in a total imaging time of 39 hours.

Optics: William Optics ZenithStar 61
Mount: PegasusAstro NYX-88
Filters: Antlia RGB V-Series PRO, Antlia Ha 4.5nm EDGE
Imaging camera: ASI 533MM PRO
Accessories: PegasusAstro FocusCube3
Guide scope: ZWO 30mm guider
Guiding camera: ASI 120MM mini

For this image special filters used combined with a mono camera (Ha, R, G and B)
All frames stacked in CCDStack2 to produce the individual master files per filter. Combination and processing performed entirely in Siril.