Exposure data
Telescope: 4.5″ Newton f=440mm + Vixen R200SS f=800mm
Camera: SBIG ST2000XM
Filters: Baader LRGB + Astronomik Hα (13nm)
Exposure times: Hα: 24x10min L: 3x10min R: 4x10min G: 4x10min B: 4x10min
Exposure time total: 6h 30min
Mount: Vixen New Atlux
Location: Erdweg/Germany (500m)
Date: 2005-09 + 2008-08-30+31
Object data of NGC 281
Object type: Emission nebula
Size: 35′ x 30′
Magnitude: 7.3 mag
Constellation: Cassiopeia
Distance: 9500 Ly