IC 2574 / Coddington's Nebula
Dwarf Irregular Galaxy in Ursa Major

RA: 10h 28m 22.7s Dec: +68 25' 00 Mag: 10.8 , Size: 12.3' x 5.9', Distance: ~13 million ly

Click image for a larger view

   IC 2574 discovered by Edwin Coddington in 1898 and classified first as a nebula is actually a dwarf irregular galaxy in the constellation Ursa Major and is part of the M81 group of galaxies. This long exposure image of this classification type SAB(s)m shows two very dim arms and irregular shape. To the north (top left) is an area of massive star formations surrounded by interstellar medium (ISM) and thought to be triggered by the central stellar cluster and because if its large size it is classified as a 'Super Giant Shell' (SGS).
An extract taken from a study by S. Steward & F. Walter 2000: In the standard picture (e.g., Weaver et al. 1977; McKee & Ostriker 1977; Chu et al.1995), these structures are believed to be created by young star-forming regions that supposedly eject a great amount of mechanical energy into the ambient ISM in terms of strong stellar winds and subsequent supernova (SN) explosions.

Location & Date Backyard, Abbott Observatory - March 2011
Temperature - Low 30's F
Telescope Deep Sky Instruments RC10C , F/7.3, Losmandy G11 Gemini, Prime Focus, Image scale 0.82 arcsec/pixel
Camera SBIG ST-2000XM w/CFW8, AO8
Baader HaLRGB AR Filters
CCD temp -25C
Exposure Times (Ha) 8x15m (Lum) 28x15m (R)13x15m (G) 8x15m (B) 17x15m Bin 1x1
Other Information Image planning - CCD Navigator
Image acquisition/focus/guiding/dither - CCD Autopilot4 w/CCDSoft/TheSky6/PinPoint
Image Processing * CCDStack- Calibration, Normalize, Alignment, Mean Combine, Deconvolution
* FITS Liberator 3 - stretching
* Adobe CS4 - L+(Ha+R),GB combine, Levels, Curves, Sharpening, Noise reduction, JPEG conversion

© 2011 Michael A. Siniscalchi