NGC 6883 (Lund 929, Cr 415) and Ruprecht 172 (Lund 930, OCL-151) Opens Clusters in Cygnus

Center of field at approximately: RA 20 hours 11 minutes 24 seconds, Dec +35 degrees 48 minutes 32 seconds

Size: 14' (35') and 4.0' (5.0') Magnitude: 8.0 and -- Class: IV 2 m n and III 2 p n

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 4.56

Image:

Lumicon Deep Sky filter, 240 minutes (24 x 10 minute subs), 08/20/23/2007

Processing:

CCDStack 1.2, Photoshop 7.0

Location:

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

Notes: Another poor open cluster in a rich Milky Way star field .... NGC 6883 is centered just a little west (right) of center, and hard to distinguish as a cluster. Ruprecht 172 is at center in the south (bottom) of this image, and at least *looks* like a cluster.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of NGC 6883 is 35 arc minutes(!), and the size of Ruprecht 172 is 5.0 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6883
NGC 6883 = Cr 415 = Lund 929 = OCL-152
20 11 19.8 +35 49 55
Size 15

17.5": two dozen stars in a 4' diameter surrounding a prominent "Y" asterism of 
five mag 10 stars with twenty additional mag 13-14.5 stars.  The brightest star 
at the base of the "Y" is a mag 9.5/10 double at 17" and the center star about 
1.5' NE is an unequal closer pair.  Surrounding this group is a oval border of 
7' diameter consisting of several strings of mag 13 stars which increase the 
total to roughly 50 stars.  Appears to be an asterism in a rich milky way field 
and best view at 100x.  Attached to Ruprecht 172.

- by Steve Gottlieb