NGC 6910 (Lund 950, Cr 420) Open Cluster in Cygnus

Located at: RA 20 hours 23 minutes 06 seconds, Dec +40 degrees 47 minutes 00 seconds

Size: 7.0' (10') Magnitude: 7.4 Class: I 3 m n

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, 250 minutes (25 x 10 minute subs), 09/6/7/2012; seeing 3.3-4.2 FWHM per CCDStack

Processing:

CCDStack 2.66.4490.32361, Photoshop CS5.1

Location:

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

Notes:

NGC 6910 is centered, and contains about 50 stars. This area is also in central Cygnus, just 0.5 degrees from Sadr (Gamma Cygni), the center of the swan. The "IC 1318" complex of nebulosity overlays many square degrees in this area. See the 8" image of NGC 6910 area.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 10 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6910

NGC 6910 = Cr 420 = Lund 950 = OCL-181
20 23 12 +40 46.7
V = 7.4;  Size 8

17.5": about 40 stars mag 7.5-15.5 in a 7' diameter dominated by two mag 7.5 
stars oriented NW-SE.  A mag 7.4 star (SAO 49556) with two faint companions is 
at the NW end and a mag 7 star (SAO 49563) is at the SE end surrounded by a rich 
group of 10 mag 12-13 stars.  Most of the cluster's brighter mag 10-11 stars are 
arranged in a NW-SE string just west of the line connecting the two bright 
stars.  A second curving offshoot to the W consisting of three mag 10 stars 
gives a "Y" shape to the cluster.  Located 40' NNE of Gamma Cygni (V = 2.2) 
within the region of the IC 1318 complex.

- by Steve Gottlieb