Image 1 of 1
NGC 6811 Cluster in Cygnus (90CFT RMod).jpg
The open star cluster NGC 6811 in northern Cygnus, aka the "Hole in the Cluster," because of a darker centre apparent at the eyepiece but somewhat lost in a photo like this. The cluster was discovered by William Herschel in 1829. The bright star at bottom is Delta Cygni, the western star in the cross-piece of the Northern Cross, aka Al Fawaris.
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.
- Copyright
- © Alan Dyer/AmazingSky.com
- Image Size
- 6720x4480 / 21.3MB
- www.amazingsky.com
- Contained in galleries
- Star Clusters, NGC/IC Objects

