This is a bicolour narrowband image of NGC281, the Pacman nebula, captured with 9 x 10min H-alpha frames and 12 x 10min OIII. The “white” parts in the middle of the nebula are where there is some OIII response in addition to H-alpha, and the yellow parts are where there is just H-alpha.
Something different last night… Instead of going for the brightest non-stellar object in Hercules, I tried one of the faintest, inspired by the picture of it in this month’s Astronomy Now. This is planetary nebula Abell 39 – 25 x 10min frames with the Atik 460ex OSC. The small edge-on spiral galaxy visible at about 10 o’clock relative to the nebula is mag 16.6 PGC58246.
Edit: A couple of nights later I acquired 17 x 10min through an OIII filter, and combined them with the RGB image shown above. This made quite a difference, and made the nebula much more apparent!
Here are a couple of images from last night. First up is face-on spiral galaxy NGC3344, possibly the most interesting object in the constellation of Leo Minor. William Optics 102GT with Atik One, 6 x 10min luminance exposures before the moon came up, and 6 x 5 min R, G and B binned 2×2.
Then there’s a quick look at M106 in Canes Venatici. This was 6 x 5 min R, G and B binned 2×2 after the moon had risen, and is a bit noisy, but the area would be worth revisiting when the sky’s a bit darker, as the annotated image shows.