NGC 6905, the "Blue Flash" nebula, is a small planetary nebula in Delphinus. ?The nebula structure is composed of an internal shell with roughly conical extensions along its major axis. ?The central progenitor is classified as a Wolf-Rayet star and now has roughly 60% of the mass of the Sun, having lost nearly 50% of its original mass through expulsion of the gas shells that form the nebula. ?The dominant blue-green color comes from ionized oxygen created during the late stages of the star's evolution. ?

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The image was captured during 4 nights in June-July 2024 from SkyPi Remote Observatory using a 12.5" PlaneWave scope and a QSI-640ws camera at f/8 for a final LRGB+O integration of 12 hours. ?The small size of the nebula (approx 45 arc-sec) made it a fairly poor target for my setup, so the posted image has been heavily cropped and rescaled. ?My only excuse is that the summer monsoons were quickly approaching in NM and I wanted to "just get one more image done." :-)
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Thanks for looking,
Bruce W.