DoDz 9 (Lund 812) Open Cluster in Hercules

Located at: RA 18 hours 08 minutes 48 seconds, Dec +31 degrees 32 minutes 00 seconds

Size: 34'* (28') Magnitude: -- Class: III 2 p

North is up

   

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

  ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 230 minutes  (23 x 10 minute subs) 06/19/2010; seeing 1.7-2.5 FWHM per CCDStack

Processing:

CCDStack 2.6.3800.24688, Photoshop 7.0

Location:

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

Notes:* This cluster's listed size (in Megastar v 5.0.12) is larger than my imaging area (about 31' x 46'), but I wanted to include it in this roundup of open clusters in Hercules that I am imaging while the moon is bright. According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 28 arc minutes, which would fit within my field of view. This is classified as a true cluster, but looks like scattered field stars in this image