Barnard 150, NGC 6946 and Comet C/2021 S3 Panstarrs

There is no well-determined distance for Barnard 150: the literature uses values between 100 and 440 parsecs (Kun et al. 2008), so we give no real width; the field also mixes a galaxy 25 million light-years away and a comet in the Solar System. Positions of the nebulae, galaxies and cluster taken from SIMBAD and NED; those of the dark nebulae are approximate. The centre of the Flying Bat (Sh2-129) lies outside the frame, so the marker was placed on the visible filaments. The position of the comet's head was measured by us on the image; the date and distance come from JPL (Horizons) for the early hours of 13 June 2024.