NGC1491

Emission Nebula in Perseus

Uploaded 12/31/02

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The angular extent of this object is surprising. Covering nearly the entire half degree field, this nameless object has a very faint extended envelope not normally recorded in white light representations. The seeing was rather poor on this night, and while not recording the extremely fine inner detail such as by Adam Blocks fine image, the goal here was to record the maximum outer nebulosity in color. This nebula has a large H-beta component, thus the color of pink seen here is the actual color.

Processing: Stacking, alignment, DDP in Maxim DL. LRGB registration in PWPro3, Final LRGB combine in PS7.

Instrument:  12.5" f/5 Home made Newtonian
Platform:  Astrophysics 1200 QMD
CCD Camera:  SBIG ST8i NABG
Guider: SBIG ST4
Exposure:  (Ha+G)RGB = 120:20:20:40 (RGB Binned 2x2)
RGB Combine Ratio:  1: .8: 1.2
Filters:  RGB Tricolor
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing FWHM = 4.5 arcsec (Maxim DL - 10min subframe), Transparency 8/10
Outside Temperature:  0 C
CCD Temperature:  -20 C
Processing Tools:  Maxim DL, RG Sigma, Photoshop, AIP4WIN, PW Pro, RW Debloomer.
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