Exposure data
Telescope: 10″ Lacerta Newton f=1000mm
Camera: SBIG ST8300M
Filters: Baader LRGB
Exposure times: L: 30x2min R: 6x5min G: 6x5min B: 6x5min
Exposure time total: 2h 30min
Mount: 10 Micron GM 1000 HPS
Location: Erdweg/Germany (500m)
Date: 2019-04-20
Object data of M 3
Object type: Globular cluster (VI)
Size: 18′
Magnitude: 6.2 mag
Constellation: Canes Venatici
Distance: 33900 Ly
