NGC 6822  -  Barnard's Galaxy

Full resolution (1600x1200 px  1.0MB)

150% resolution (1.7MB)

Inverted image (0.7MB)

Object identification (0.3MB)

Object data of NGC6822

Object type: galaxy (dwarf Irr)
Size: 15.4' x 14.2'
Magnitude: 9.3 mag
Constellation: Sgr
Distance: 1.6  MLy
Notes: NGC 6822 was discovered by E.E. Barnard in 1884. This  irregular dwarf galaxy is a member of the Local Group.

There is much dust in this region of the sky, as can be seen clearly in the inverted image. The dust is a part of our milky way. Because we are looking through this dust at Barnard's Galaxy, the colour of NGC6822 is more reddish than it would have been without dust: E(B-V)=0.24 mag.

Many HII regions can be found in the above image. The object identification shows the following HII regions, discovered by Hubble in 1925: HI, HII, HIII, HV and HX. Also, some HII regions, which were discovered by Hodge in 1969 are visible: Ho5, Ho8 and Ho15.

Exposure data

Date: 2009-09-14 + 15 + 16 + 17
Location: La Palma / Spain (1700m)
Telescope: TeleVue NP101 (4" Apo f=540mm)
Camera: ST2000XM with CFW8 and Baader Filters
Binning: L 1x1 / RGB 1x1
Exposure time: L 20x12m / R 4x12m / G 4x12m / B 4x12m
Exposure time total: 6h 24m