Exposure data
Telescope: 4.5″ Newton f=440mm
Camera: SBIG ST2000XM
Filters: SBIG RGB + Astronomik Hα 13nm
Exposure times: Hα: 16x10min R: 2x10min G: 2x10min B: 2x10min
Exposure time total: 3h 40min
Mount: Vixen GPDX
Location: Erdweg/Germany (500m)
Date: 2005-12-10
Object data of NGC 2237
Object type: Open star cluster (ll 3 r n) with emission nebula
Size: 80′ x 60′
Magnitude: 6.0 mag
Constellation: Monoceros
Distance: 5000 Ly
