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:

 14.5" f5 Newtonian reflector

Camera:

ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter,  360 minutes  (36 x 10 minute subs), 08/17/18/2014; seeing 2.7-4.0 FWHM per CCDStack

Processing:

CCDStack 2.81.5337.19441, Photoshop CS5.1

Location:

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

Notes:

See the 8" 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