Telescope: Celestron Comet Catcher 5.5” f/3.6 Schmidt Newtonian, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, 0C; Gain: 200
Filter: 1.25” OPT Triad Hb, OIII, Ha filter
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Exposure: 61x240sec saved as FITS
Darks: 32x240sec saved as FITS
Flats: 32x0.015sec Tee flats taken at dusk
Average Light Pollution: Red zone (Bortle 8), fair transparency, bright moonlight
Lensed Sky Quality Meter: 17.5 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop
I like to use the nights around the full moon to experiment and to try something new or different. During this month’s Hunter’s Moon I spent a bit of time imaging M33 and M31 in narrowband to see what there was to see. I was particularly interested in trying to detect emission nebula in these two nearby galaxies. Even in white light M33 shows a large, bright emission nebula to the northeast of the core (NGC 604). In narrowband you can see numerous knots of star forming regions scattered along the spiral arms including the far-flung arms well outside the central spiral structure shown here.