Exposure data
Telescope: 4.5″ Newton f=440mm
Camera: SBIG ST2000XM
Filters: SBIG GB + Astronomik Hα (13nm)
Exposure times: Hα: 20x8min G: 8x5min B: 8x5min
Exposure time total: 4h
Mount: Vixen New Atlux
Location: Erdweg/Germany (500m)
Date: 2008-08-29+30
Object data of M 17
Object type: Emission nebula
Size: 20′ x 15′
Magnitude: 6.0 mag
Constellation: Sagittarius
Distance: 5700 Ly
