Exposure data
Telescopes: 4.5" Newton f=440mm + Vixen R200SS (8" Newton f=800mm)
Camera: SBIG ST2000XM
Filters: SBIG LRGB + Astronomik Hα (13nm)
Exposure times: Hα:24x10min L:3x10min R:4x10min G:4x10min B:4x10min (Hα:1x1 L:1x1 RGB:2x2)
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
Notes: North is right