NGC 6820 (SH2-86, LBN 135) / NGC 6823 (Lund 903, Cr 405) Bright Nebula / Open Cluster in Vulpecula

Located at: RA 19 hours 43 minutes 23 seconds, Dec +23 degrees 16 minutes 00 seconds

Size: 24.7' x 12' / 12' (7.0') Magnitude: -- / 7.1 Class: Emission (Sharpless) 1 2 2 / I 3 m 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:

Red (Hoya 25A) filter, 470 minutes (47 x 10 minute subs), 10/26/27/28/2006

Processing:

CCDStack 1.1, Photoshop 7.0

Location:

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

Notes:

NGC 6823 is the open cluster in the center of the image; NGC 6820 (Sh2-86) is also the little knot of nebulosity to the southwest (lower right, see NGC Project description).

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of the open cluster is 7.0 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6820

NGC 6820 = Sh 2-86 = PP 89
19 42 27.9 +23 05 15
Size 40x30

17.5": at 100x using OIII filter, open cluster N6823 is immersed in a faint 
nebulosity.  Also extends 5'-10' SW from the core of the cluster to a group of 
stars which wasn't included in the description of N6823.

This observation refers to Sh 2-86 which is the commonly accepted identification 
of N6820, but based on Marth's position and description, N6820 probably refers 
to a very small knot of nebulosity to the SW of the cluster (see description for 
IRAS 19403 +2258).

8": extremely faint nebulosity in field of N6823.  Involves four stars in the 
north and two stars in the south side.

- by Steve Gottlieb
Contemporary Visual Observation(s) for NGC 6823
NGC 6823 = Cr 405 = Lund 903 = OCL-124 = LBN 135
19 43 09 +23 18.0
V = 7.1;  Size 12

17.5" (8/10/91): about 50 stars in the central 5' diameter, bright, moderately 
large, fairly rich.  Includes four bright mag 9.5-11 stars in a tight group at 
the core of the cluster plus two or three very faint stars in a 20" diameter.  
Most of the stars form a distinctive 5' oval ring, elongated ~E-W.  Emission 
nebulosity N6820 is entwined.

- by Steve Gottlieb