M 11 (NGC 6705, Lund 865) Open Cluster in Scutum

Located at: RA 18 hours 51 minutes 06 seconds, Dec -06 degrees 16 minutes 00 seconds

Size: 13' (11') Magnitude: 5.8 Class: I 2 r

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.54

Image:

Red (Hoya 25A) filter, 160 minutes (16 x 10 minute subs), 08/4/5/2006

Processing:

CCDStack 1.2, Photoshop 7.0

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes:

This image replaces last years 25 minute (5 x 5 min subs) unfiltered image. See the 14.5" version.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 11 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6705

NGC 6705 = M11 = Wild Duck cluster = Cr 391
18 51 05 -06 16.2
V = 5.8;  Size 14

13.1": at 140x, several hundred stars mag 11-15 and a brighter mag 8 star (SAO 
142695) in a 10' region form a remarkably rich cluster including some dense 
knots of stars.  A starless vacuity is visible just W of center at medium power.  
Dark lanes appear to wind through the cluster at high power grouping the stars 
into chains.  Several dark nebula are near including B108, B112, B318.

8": this is the most impressive open cluster with this aperture.  Appears as an 
extremely rich carpet of faint stars and dense clumps in an arrowhead shape.

- by Steve Gottlieb