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NGC 663 and M103 Clusters in Cassiopeia (90CFT RMod).jpg
This is the field containing the assortment of open star clusters near the star Delta Cassiopeiae, or Ruchbah, at lower right. The bright cluster to the left of Ruchbah is Messier 103. But the more prominent and richer cluster in the field is NGC 663, aka the Letter S Cluster, at left of centre. Below it is the smaller NGC 659, while above it is NGC 654. The yellowed cluster at upper left is IC 166, while the small cluster above M103 is Trumpler 1. So there are clusters in this field from several catalogues. A small bit of reflection (?) nebulosity unidentified on any print or digital atlas I have sits in the dark nebula at top right.
The field of view is 4.7° by 3.1°.
This is a stack of 10 x 6-minute exposures with the Astro-Tech 90CFT refractor with the 0.8x Reducer for f/4.8 and the filter-modified Canon R at ISO 800. On the Astro-Physics 600E mount and autoguided with the MGENIII guider. No filter employed other than a UV/IR Cut filter.
The field of view is 4.7° by 3.1°.
This is a stack of 10 x 6-minute exposures with the Astro-Tech 90CFT refractor with the 0.8x Reducer for f/4.8 and the filter-modified Canon R at ISO 800. On the Astro-Physics 600E mount and autoguided with the MGENIII guider. No filter employed other than a UV/IR Cut filter.
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- © Alan Dyer/AmazingSky.com
- Image Size
- 6720x4480 / 23.0MB
- www.amazingsky.com
- Contained in galleries
- Star Clusters, NGC/IC Objects

