NGC 225 (Lund 25, Cr 7) Open Cluster in Cassiopeia

Located at: RA 00 hours 43 minutes 30 seconds, Dec +61 degrees 47 minutes 00 seconds

Size: 12' (15') Magnitude: 7.0 Class: III 1 p n

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, 240 minutes (24 x 10 minute subs), 10/11/2008; seeing 2.6-4.3 FWHM per CCDStack

Processing:

CCDStack 1.3.7, Photoshop 7.0

Location:

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

Notes: This field contains two objects that are not plotted on my charting software (Megastar v5.0.12). The plume of nebulosity just above the open cluster NGC 225 is the Bright Nebula vdB 4 (GN 00.40.4), and just above vdB 4 is the southern end of the Dark Nebula LDN 1302.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 15 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 225
NGC 0225 = Cr 7 = OCL-305 = Lund 25
00 43.5 +61 47
V = 7.0;  Size 12

17.5": about two dozen stars at 100x in a 12' diameter.  Bright but scattered.  
Outline forms an isosceles triangle with the vertex at W edge and the long base 
on the E side.  Most stars are mag 10-11 and evenly spaced.  The cluster appears 
completely resolved.  Only one fairly close double star in group.  Just ENE of 
the main group is a line of five mag 9 stars oriented N-S.

8": two dozen stars in cluster, fairly bright but scattered, no dense spots.

- by Steve Gottlieb