Gum 15 / RCW 32 Hydrogen Emission Nebula
22-Jan-2016
Gum 15 is a cloud of hydrogen gas 3,000 light-years from Earth. It is shaped by aggressive winds flowing from the stars within and around it.
Image:
- 29x 300s luminance bin2x2 + 12x flat + 50x dark + 120x bias
- 14x 600s Ha bin2x2 + 22x flat + 50x dark + 120x bias
- 24x 200s red bin3x3 + 22x flat + 50x dark + 120x bias
- 20x 200s green bin3x3 + 24x flat + 50x dark + 120x bias
- 21x 200s blue bin3x3 + 24x flat + 50x dark + 120x bias
Total exposure time: 8 hours 22 minutes.
Hardware:
- Celestron EdgeHD 1100 with CGEM DX mount
- Celestron 0.7x EdgeHD focal reducer
- QSI 683-wsg Camera @ -15°C
- Astronomik Type 2c LRGB filters
- Astronomik Ha 6nm filter
- Orion StarShoot Autoguider
- Starlight Xpress Adaptive Optics
Location:
- Orange zone in Brisbane, Australia. (Bortle 7)
- Imaging over 4 nights - average to above average seeing + waxing gibbous moon.
Software:
- Captured with AstroArt 6
- Guiding with PHD2 + PHD_Dither
- Aladin 8.0: Planning & camera alignment.
- CCDInspector: Image analysis & rejection
- CCDStack 2+: Calibrate, align, normalize, stack, curves, deconvolve luminance, combine RGB.
- Photoshop CC: Reduce noise, integrate L+Ha+RGB, high pass filter, shadows/highlights, unsharp mask, shrink stars, color balance.