This wide field view of the Cassiopeia Milky Way captures ten named open clusters – .NGC 663, NGC 654, NGC 659, Messier 103, Berkeley 6, Berkeley 7, IC 166, Czernik 4, Czernik 5 and Trumpler 1. The first image below is an annotated image.
For the past several months I have been following the Milky Way galaxy across the sky and have been trying to find fields that contain multiple examples of open clusters with my short focal length refracting telescopes. This field with ten named open clusters if the best I have been able to find to date.
This image was taken on the night of October 10, 2018 from the Anza-Borrego Desert State Park in San Diego County, California using a Takahashi FSQ-106 with the f/3 reducer and with a ZWO ASI1600MM-C camera using Baader 36mm unmounted filters. The total exposure time was 2.5 hours with 25 x 120 second sub-exposures per RGB color channel.
The raw subexposures were calibrated, aligned and stacked using PixInsight. The image alignment and stacking also used PixInsight’s drizzle integration feature to improve star profiles. The color channels were combined into a color image and a mild histogram stretch was performed in PixInsight. Final color adjustments and export as a sRGB JPEG image was done using Photoshop CC.
Both images below can be clicked on to show slightly larger versions. Higher resolution versions can be viewed on my Astrobin page.
Click on the image below to see a higher resolution version.