Comet Lovejoy/UGC 8467

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Uploaded 6/17/07

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Riding high in the coils of Draco the sea serpent, Comet Lovejoy still has some surprises to offer the astroimager. On this night, the comet came very close to the 14.8 magnitude SBb galaxy UGC 8467, the galaxies central bar can be seen clearly. The comet itself is near magnitude 12.7, and is very faint visually. Surprisingly, the coma is still a rich green color and the nearly 1/4 degree tail can be seen extending to the edges of this half degree tall field.

This is my longest exposure ever of a comet. With 2h of integration time, faint background galaxies abound. A fine example is the 17.6th magnitude edge on to the lower right. This is an irregular type only 1.4 arcminutes on a side, and full of knots and fine details. Most of the other smaller galaxies seen here are near 20 - 22nd magnitude.

Instrument: 12.5" f/5 Home made Newtonian Mount: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: DSI Pro w/Lumicon Newt Easy Guider Exposure: LRGB = 60:20:20:20 (RGB Binned 2x2) AstroDon RGB Combine Ratio: 1: 1.05: 1.11 Location: Payson, Arizona, Elevation: 5150 ft. Sky: Seeing FWHM = 5 arcsec (Maxim DL - 10min subframe), Transparency 6/10 Outside Temperature: 55 F CCD Temperature: -30 C Image Processing Tools: Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking PixInsight: Curves, Deconvolution, noise reduction Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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