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Imaging telescope or lens:TS Optics APO130f6
Imaging camera:ZWO ASI1600MM-Cool
Mount:Ioptron CEM 120 EC2
Guiding telescope or lens:TS Optics APO130f6
Guiding camera:Starlight Express Lodestar X2 Autoguider
Focal reducer:TS-Optics TSFlat 2
AstroDon 5nm Ha filter: 6x600" (gain: 139.00) -12C bin 1x1
AstroDon 5nm Ha filter: 12x600" (gain: 139.00) -15C bin 1x1
AstroDon 5nm Ha filter: 4x600" (gain: 139.00) -9C bin 1x1
AstroDon 5nm OIII filter: 9x600" (gain: 139.00) -12C bin 1x1
AstroDon 5nm OIII filter: 14x600" (gain: 139.00) -15C bin 1x1
AstroDon 5nm OIII filter: 3x600" (gain: 139.00) -9C bin 1x1
AstroDon 5nm SII filter: 4x600" (gain: 139.00) -12C bin 1x1
AstroDon 5nm SII filter: 13x600" (gain: 139.00) -15C bin 1x1
AstroDon 5nm SII filter: 3x600" (gain: 139.00) -9C bin 1x1
ZWO new G: 5x120" (gain: 50.00) -12C bin 1x1
ZWO new R: 5x120" (gain: 50.00) -12C bin 1x1
Integration: 11.7 hours
Flat darks: ~25
Avg. Moon age: 17.17 days
Avg. Moon phase: 89.19%
Mean SQM: 18.70
Mean FWHM: 3.00
Astrometry.net job: 2975196
RA center: 344.002 degrees
DEC center: 62.404 degrees
Pixel scale: 0.906 arcsec/pixel
Orientation: 359.753 degrees
Field radius: 0.724 degrees
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
September session : I had 2 weeks of nearly perfect weather but ... under the full moon ! So I tried to see how my NB filter will do under the full moon.
This image was obtained using exposures spanning over six nights !
Each night consisted of multiple targets and meridian flips (IC1805, M31x2 and M33). Everything is now working fully unattended.
One interesting thing, is that during night of 16 september, the sky was blocked by clouds at the beginning of the night. I therefore left my session active, but under "recovery mode" in SGP. It automatically resumed during the night when the clouds cleared (3 times actually).
The interesting thing about automation is that I was able to image targets when they are close to the meridian and use the full duration of the night (here around 10hours) by switching targets.
The processing was done in PI as follow :
For each S, H, O, R, G, B channels :
- Images Calibration (Dark Substraction)
- Cosmetic Correction
- Image Registration
- Image Integration
- Mure Denoise (for SHO only)
- Create SHO image
- Create RGB image and color balance and color sat (to be used to color stars in SHO)
- Color balance on nebula
- Deconvolution masked with 2.0 pixel psf
- Background extraction
- SCNR (G neutral and min 0.85)
- Going NL using HT
- Color Saturation masked (and desaturate bkg)
- Color Saturation masked using stars to desaturate stars
- Apply "a" & "b" color channels of the RGB image under star mask
(this is to apply natural color to the stars)
- Redo Color Balance on stars
- Local Histogram Equalisation masked (slight)
- TGV denoise (no mask)
- Local Histogram Equalisation (at 90 and 250 px scales)
Final image adjustments performed in Iphoto on Imac :
- levels adjustments
- adjust color looking using "selective color"
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