M11 (NGC 6705, Wild Duck Cluster) - Open Cluster in Scutum

LRGB combination (Click for a larger view 1400 x 1400 px)


M11 (NGC 6705, Wild Duck Cluster) - Open Cluster in Scutum

Discovered by Gottfried Kirch in 1681. Charles Messier included it in his catalogue in 1764.

M11 (Messier 11, NGC 6705) is an open cluster located in the beautiful Scutum star cloud, surrounded by one of the most dense star fields in the sky. M11 has been described as one of the richest and most compact open clusters. This cluster lies 6000 light-years from Earth and has a diameter of about 21 light-years. It is composed of more than 2900 stars, 600 of which have a visual magnitude brighter than 15. Its age has been estimated to about 250 million years. I Many of the stars are brighter than 11th magnitude.


Right Ascension 18:51 (h:m)
Declination -06:16 (deg:m)
Distance 6 (kly)
Visual Brightness B=6.32, V=5.8 (mag)
Apparent Dimension 11 x 11 (arc min)

Seeing: Pickering 7 rating - Good
Optic(s): RC 12" with Astro-Physics corrector @ f/5.4
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-23
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 9 min, R = 9 min, , G = 9 min, , B = 9 min, subs. 3 min, Bin 1, Total Exposure Time - 36 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided

PixInsight / PS


All Contents copyright Velimir Popov unless otherwise noted.