astroimages
Darin E. Fields' Astrophotography Pages
 

M3: Globular Cluster in Canes Venatici

Right Ascension 13 : 42.2 (h:m)
Declination +28 : 23 (deg:m)
Distance 33.9 (kly)
Visual Brightness 6.2 (mag)
Apparent Dimension 16.2 (arc min)
More information on M3

Exposure: 19 minute LRGB exposure: L=400sec, R=240sec., G=240sec., B=240sec., all in stacked iterations of 20 seconds.
Camera: ST-237 cooled @ -23c
Guiding: Unguided
Telescope: 8" f/ Newtonian
Mount: Losmandy/Gemini G-11
Processing: Maxim/DL, Photoshop 6.0
Date: 4-24-02
m3-lrgb-2: