Holmberg II

Full resolution (1600x1200 px  450kB)

Object identification (1600x1200 px  450kB)

Object data of Holmberg II

Object type: galaxy (dwrf Ir)
Size: 9.3' x 6.6'
Magnitude: 11.3 mag
Constellation: UMa
Distance: 8 Mio Ly
Notes: Holmberg II (=UGC4305) is an irregular dwarf galaxy, which is a member of the M81 group of galaxies. It shows several bright HII regions and many blue stellar complexes, which are a sign of star forming.

The object identification image shows the very distant galaxy cluster J0819+7054 near the top border of the image. The light of this galaxy cluster needs 2.6 billion years to reach earth.

Exposure data

Date: 2008-03-06 + 28 + 30  +  2008-04-05
Location: Nussbach / Austria (400m)
Telescope: 12" Newtonian telescope (f=1139mm)
Camera: ST2000XM with CFW8 and SBIG Filters
Binning: L 1x1 / RGB 2x2
Exposure time: L 23x12m / R 8x12m / G 8x6m / B 8x6m
Exposure time total: 7h 48m
Notes: First Deep Light of 12" Newtonian telescope