Spiral Galaxy in Camelepodarus

Uploaded 4/17/05

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 This Sc spiral is often overlooked by many well known astrophotographers because of its high declination, lack of bright guidestars, and low surface brightness. However, careful deep exposures are very rewarding, and can reveal a wealth of details. NGC2403 is 8.9 magnitude, and 22 x 12 arcminutes inside, filling nearly half of this .5 degree field. Only one 17 magnitude anonymous galaxy is seen just above the center, the field is mostly devoid of brighter background galaxies.

This is a very carefully G2V calibrated color image. The luminous straw colored core surrounded by delicate blue arms is as accurate as I can portray them in a color sense. Witness also the beautiful pink HII regions, a combined mix of the two main Hydrogen lines, Ha and Hb, which are crimson red and electric arc blue respectively.

Seeing has not yet returned to normal levels of about 2 - 4 arcseconds, and was a bit rough for this image at 4.8 arcsec.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG ST10XME NABG with Enhanced Cooling Guider: SBIG ST4 Exposure: LRGB = 60:20:20:20 (RGB Binned 2x2) RGB Combine Ratio: 1: 1: 1.1 Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 4.8 arcsec (Maxim DL - 10min subframe), Transparency 7/10 Outside Temperature: 10 C CCD Temperature: -20 C Processing Tools: Maxim DL, Photoshop CS, PixInsight, RW Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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