NGC281
- "PacMan Nebula"
Emission
Nebula in Cassiopia
Uploaded
10/31/10
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.
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Instrument: 8" f/4 Orion Astrograph with Baader MPCC (in wrong spot)
Mount: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling
Guider: Meade DSI Pro
Exposure: LRGB = 120:20:20:20
AstroDon RGB Combine Ratio: 1: 1.05: 1.2
Location: Payson, Arizona, Elevation: 5150 ft.
Sky: Seeing FWHM = 5 arcsec (Maxim DL - 10min subframe), Transparency 9/10
Outside Temperature: 50 F
CCD Temperature: -30 C
Image Processing Tools:
Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking
PixInsight: Curves, Deconvolution
Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup
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