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Contains:  NGC 6811
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NGC 6811, 


            Gary Imm
NGC 6811

NGC 6811

Technical card

Resolution: 4152x3268

Dates:May 29, 2018

Astrodon Blue 31mm Gen2 I-Series: 30x60" (gain: 139.00) -15C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 30x60" (gain: 139.00) -15C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 30x60" (gain: 139.00) -15C bin 1x1

Integration: 1.5 hours

Avg. Moon age: 14.67 days

Avg. Moon phase: 99.99% job: 2087851

RA center: 19h 37' 12"

DEC center: +46° 21' 39"

Pixel scale: 0.781 arcsec/pixel

Orientation: 263.809 degrees

Field radius: 0.574

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This object is an open star cluster located 3000 light years away in the constellation of Cygnus. It consists of about 250 stars scattered across a circular area about half the size of the full moon.

It is categorized as a Trumpler type III 1 r cluster, which means that it is a rich, fairly loose collection of equally bright stars. It has been described in various ways, including "Hole in a Cluster", "Smoke Ring" and "Star Clover". To me, a more appropriate description would be "The Dark Cross", since I see a dark area roughly in the shape of a "+" at the center of the object.

All of the cluster stars are fairly dim, so whatever you want to call it, it is not a spectacular cluster in my book. The bright nearby collection of stars, partially seen at the bottom of the image, is a more obvious and attractive sight to me than NGC 6811, but I don't believe that it has a designation.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


NGC 6811, 


            Gary Imm