Open Cluster with Nebulosity in Cassiopeia

Uploaded 12/21/08

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Surrounding the dim but moderately rich open cluster IC1590 is Sharpless2-184, also known as NGC281. The nebula is quite large, spanning over half a degree in size, filled with dark Bok globules, the birthplace of stars. The cluster on the other hand is a respectable 7.4 magnitude, but only 4 minutes in size.

Seen here clearly is the unique color differentiation from bright core to outer nebulosity. While the core has more blues which yield a bluish pink tint the outer most nebulosity is deep red and represents a much lower level of hydrogen excitation. The beautiful dark nebula superimposed are called Bok Globules, and represent areas of a higher density of dust becoming gravitationally bound.

Instrument: 12.5" f/5 Home made Newtonian Mount: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: Meade DSI w/Lumicon Newt Easy Guider Exposure: HaRGB = 120:10:10:10 AstroDon RGB Combine Ratio: 1: 1.05: 1.11 Location: Payson, Arizona, Elevation: 5150 ft. Sky: Seeing FWHM = 10 arcsec (Maxim DL - 10min subframe), Transparency 9/10, 21.1 mag/sec sky Outside Temperature: 35 F CCD Temperature: -30 C Image Processing Tools: Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking PixInsight: Curves, Deconvolution Photoshop CS2: Curves, Color Correction, Cleanup HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS