Exposure data
Telescope: 12″ Meade ACF f=1500mm mit Reducer Lumicon Giant Easy Guider
Camera: SBIG ST2000XM
Filters: SBIG LRGB
Exposure times: L: 30x2min R: 5x2min G: 5x2min B: 5x2min
Exposure time total: 1h 30min
Mount: Vixen New Atlux
Location: Erdweg/Germany (500m)
Date: 2007-03-15
Object data of M 3
Object type: Globular cluster (VI)
Size: 18′
Magnitude: 6.2 mag
Constellation: Canes Venatici
Distance: 33900 Ly
