M 3 (NGC 5272, GCL 25) Globular Cluster in Canes Venatici

Located at: RA 13 hours 42 minutes 11 seconds, Dec +28 degrees 22 minutes 32 seconds

Size: 18' Magnitude: 6.3 Class: 6

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 4.53

Image:

 Red (Hoya 25A) filter, 200 minutes (20 x 10 minute subs), 05/28/2006; seeing 2.4-3.3 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 image replaces one of my first sequences (unfiltered, 30 minutes total exposure, 5 min subs) taken last August (2005). See the 14.5" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 5272

NGC 5272 = M3
13 42 11.4 +28 22 38
V = 5.9;  Size 16.2

13.1": stunning, several hundred stars resolved at 220x including the dense 
core.

8": outer halo well resolved into several lanes converging to an intense core.  
A few faint stars are resolved on the edge of the core.

- by Steve Gottlieb