This beautiful object in the Twins marks the end remains of a dead star. This is just a section of this large object, one of the few visually observable collisionaly excited nebula in the sky. The main arc is 27 acrmins long by 7 mins wide, which is brighter part of a huge asymmetrical bubble. This object is exceedingly dim visually, and is not even visible without a OIII nebula filter with my 12.5 inch. This image is an RRGB, which the luminance channel was shot with the red filter.

Processing: Calibration - Dark, Flat with Maxim DL, gamma stretch, RL deconvolution HF - AIP, LRGB combine - Photoshop 6.

Instrument:  12.5" f/5 Home made Newtonian
Platform:  Astrophysics 1200 QMD
CCD Camera:  SBIG ST7E w/Enhanced Cooling
Exposure:  RRGB = 70:20:20:40 (RGB Binned 2x2)
Filters:  RGB Tricolor
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing FMHW = 2.0 arcsec, Transparency 8/10
Outside Temperature:  15 C
CCD Temperature:  -25 C
Processing:  Maxim DL, Photoshop, AIP4WIN, PW Pro.