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:

 14.5" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Red filter, 420 minutes (42 x 5 minute {300 seconds} plus 21 x 10 minute subs), 04/24/ & 05/3/2014; seeing 2.5-3.8 FWHM per CCDStack

Processing:

CCDStack 2.77.5159.19820, Photoshop CS5.1

Location:

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

Notes:

I added one more night of 'normal' 10 minute subs (see 42 x 5 minute subs) to try to enhance the fainter outer envelope ... See the 8" 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