NGC 6811 is an open cluster in the constellation of Cygnus. It has an angular size half that of the full Moon and includes about 1000 stars of roughly similar magnitude. It has also been called “The Hole in the Cluster” because of its dark centre.
Observing:
It appears as a hazy patch in 10x binoculars, but it is best seen at around 70x with a moderate-aperture telescope.
Images by Neil Webster
‘Hole in a Cluster’
Altair Astro 115 APO, NEQ6, Canon 600D, ZWO AS1385 MC, ISO 800, f/7
Exposure: 26x 180s
St Marys Platt, England