NGC 6822 - BARNARD GALAXY

DWARFT GALAXY IN SAGITTARIUS

 (ra: 19.44,9/ dec -14:48)

September 2009, Mercedes Observatory Buenos Aires, Argentina

Collaboration with Ezequiel Bellocchio - AstroPilar

DATA

TYPE: Dwarft Galaxy

Apparent Magnitude: 9

Apparent Diameter: 10.2 arc minutes

DISTANCE: 1,5 Mio lights years

IMAGE INFORMATION

SCOPE: Celestron C8 SCT working at f6 (roughly)

CAMERA: SXVF H9

GUIDING: William Optics Zenithstar 66 with WO 0.8 x fr/ff

IMAGE ACQUISITION: AstroArt 3.0 - Control Interface 3.72 plug in

FILTERS: Astronomik Type II - Astronomik Ha 6 nm - Atik Filter Wheel

SKY CONDITIONS: rural skies - transparency regular / 1/3 moon close to the object

EXPOSURES: LHaRGB (30,20,20,20,20)

PROCESSING: Images Plus, CCD Sharp, Photoshop CS2

OBJECT DESCRIPTION AND IMAGE SESSION

NGC 6822 is a irregular Galaxy similar to the Large Magellanic Cloud and belongs to the Local Group. It ones of the nearest Galaxies after Sagittarius Dwarf and the LMCs. Because of its size it has a low surface brightness. It can be seen through telescopes only in very dark skies. It was discovered by E.E. Barnard in 1884 using a 6 inches refractor. The Galaxy presents several rich structures of HII which is evidence of star forming regions.

The night was not so transparent because the moon was relatively close to the object. Its dim stellar clouds might b washed out by Moonlight.