Back with the GT81 and color targets shot in HaGB

June 1, 2020 - Reading time: 2 minutes

Messier 13 (NGC 6205) Globular Cluster in the constellation Hercules. I shot this in hydrogen-alpha (Ha) + Green and Blue, mapped to RGB color, with 40 x 30-second exposures for each. Notes: William Optics GT81 apo refractor + Flat 6AII, ZWO ASI1600MM-Pro mono camera with Astronomik 6nm Ha, Baader broadband GB filters, Moonlite focuser, iOptron CEM25P mount.  

This one's a little more subtle. The bright, irregular HII region on the left is Sh 2-90 in the constellation Vulpecula, along with concentric swirls and knots of interstellar dust that make up the dark nebulae LDN 800, 806, 807, 808 (right side). 70 x 180-second subs Ha, 42 x 180-sec subs Blue, 39 x 180-second subs Green. I lost a batch of my broadband frames to some fast moving clouds, but managed to process what was left into a reasonably decent shot.

Setup for the night: iOptron CEM25P mount, William Optics GT81 Apo refractor with FLAT 6AII (382mm fl, f/4.7), Moonlite focuser, Orion Thin Off-Axis Guider with QHY 5iii178 guide cam, ZWO EFW with Astronomik 6nm narrowband filters (Ha, OIII, SII), Baader broadband Green and Blue filters), ZWO ASI1600MM-Pro cooled monochrome camera, Pegasus Astro Pocket Powerbox for dew control, temperature, humidity reporting. Controller: Fanless i5 Windows 10, ASCOM, Sequence Generator Pro.