My NGC1999 from suburban Brisbane. I noticed a little SII signal from a test shot, but not a lot of OIII. I decided to try a Ha-SII-LRGB image, with the Ha mapped to red, and the SII lightly black clipped and mapped to blue.
I was a bit reluctant to post here as I'm still navigating the steep learning curve due to switching to PixInsight from Photoshop. I thought it looked good in PI, but I think PS must have done something with the color profile when I out the label on because now it looked over-saturated. I need to go back and re-edit, but all my xmas/new year spare time is now exhausted and I'm back to the daily grind.
(That said, I'm chuffed that I managed to get some blue out of NGC1999 and the black window)
Image:
- 45x 300s Luminance
- 35x 150s Red
- 36x 150s Green
- 34x 150s Blue
- 33x 600s H-alpha
- 52x 300s Sulfur-II
Total exposure 17 hours 48 minutes.
Hardware:
- Skywatcher Black Diamond 80ED
- Skywatcher EQ8 Pro mount
- QSI 683-ws8 Camera @ -15°C
- Astronomik Typ 2c Luminance, Deep Sky RGB, 6nm H-alpha, 6nm SII filters
- Starlight Xpress Lodestar X2 Autoguider
- Innovations Foresight On Axis Guider
- Starlight Instruments Focus Boss II
Location:
- Orange zone in Brisbane, Australia. (Bortle 7)
- Imaged over 5 nights, new moon.
Software:
- Planning & camera alignment with Aladin 9
- Captured with AstroArt 6
- Guiding with PHD2 + PHD_Dither
- FocusLock live focusing
- CCDInspector: Image analysis & rejection
- CCDStack 2+: Calibrate, align, stack.
- Pixinsight 1.8: Crop, deconvolution, TGV denoise, MMT denoise, MT star reduction, histogram stretch, local histogram enhancement, MLT sharpen, linear fit RGB, color calibration, pixel math to add HII to luminance, LRGB combination, pixel math to add SII to blue channel, saturation.
Higher resolution here:
www.observatory.site
