NGC 7789 (Cr 460, Mel 245) Open Cluster in Cassiopeia

Located at: RA 23 hours 57 minutes 26 seconds, Dec +56 degrees 46 minutes 14 seconds

Size: 15' (25') Magnitude: 6.7 Class: II 2 r

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 Red filter, 760 minutes (76 x 10 minute subs), 10/7/8/9/2011; seeing 2.5-3.3 FWHM per CCDStack

Processing:

CCDStack 2.24.4110.20701, Photoshop CS5.1

Location:

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

Notes:

This image replaces the 270 minute red-filtered 11/2006  image. See the 14.5" version.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 25 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7789

NGC 7789 = Cr 460 = Lund 1053 = OCL-269
23 57 24 +56 42.5
V = 6.7;  Size 16

17.5" (10/12/85): few hundred stars resolved in a 20' field.  Remarkably rich 
and fairly uniform carpet of stars mag 11 and fainter.

8" (11/8/80): extremely rich, uniform in faint stars.  Certainly among the top 
open clusters with this aperture.

- by Steve Gottlieb