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I agreeImaging 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
Software:Sequence Generator Pro, PixInsight , PHD Guiding 2.5.0
Filters:ZWO new B, ZWO new G, ZWO new R, ZWO new L
Accessories:ZWO EFW 31mm 8 positions, QHYCCD PoleMaster, Innovations Foresight ONAG, USB_Focus V3 Usb Focus, USB Stepper Motor Heavy Load
Resolution: 4569x3430
Dates:Aug. 2, 2019, Aug. 3, 2019, Aug. 4, 2019, Aug. 5, 2019
Frames:
ZWO new B: 30x120" (gain: 139.00) -15C bin 1x1
ZWO new B: 17x300" (gain: 50.00) -15C bin 1x1
ZWO new G: 30x120" (gain: 139.00) -15C bin 1x1
ZWO new G: 29x300" (gain: 50.00) -15C bin 1x1
ZWO new L: 60x120" (gain: 139.00) -15C bin 1x1
ZWO new L: 68x300" (gain: 50.00) -15C bin 1x1
ZWO new R: 30x120" (gain: 139.00) -15C bin 1x1
ZWO new R: 30x300" (gain: 50.00) -15C bin 1x1
Integration: 17.0 hours
Avg. Moon age: 3.31 days
Avg. Moon phase: 13.30%
Mean SQM: 21.30
Mean FWHM: 2.60
Astrometry.net job: 2985930
RA center: 21h 16' 24"
DEC center: +68° 15' 32"
Pixel scale: 0.908 arcsec/pixel
Orientation: 180.066 degrees
Field radius: 0.721
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
I spent most of these 4 moonless nights with dark sky (around 21.3 SQM) to image this nebula with LRGB filters.
17 hours is currently my longest total exposure on a single target. Stars with mag 22.5 should be visible (with SNR=5) on the image.
My AO was off, and I use multistar guiding with PHD2 directly on the CEM120EC2 mount. It worked well but apparently, I was better not using to fast corrections (it seems to interfere with the encoders work). I used typically 2 sec guide steps. My objective is to use back AO with faster guide steps.
The image is color balanced on stars.
The processing was done in PI as follow :
For each L, R, G, B channels :
- Images Calibration (Dark Substraction, deFlat)
- Cosmetic Correction
- Image Registration
- Image Integration
- Mure Denoise
Then :
- Create super L image (integration of L and RGB individual channel)
- Create RGB image and color balance using R,G,B channels
- LRGB combination with superL
- DBE
- Color balance on stars
- Color Saturation masked (and desaturate bkg)
- Deconvolution masked with 1.8 pixel psf
- Background extraction
- Going NL using HT
- TGV denoise (no mask)
- Local Histogram Equalisation (at 90 pix scale)
- Color Saturation masked using stars to boost stars color
- Color Balance on stars
- Color Saturation masked using stars to boost stars color
- Deflip
- Crop
Final image adjustments performed in Iphoto on Imac :
- levels adjustments
with star color deringing
| Sharpless2 Objects |
| ZWO ASI1600MM/QHY163M |
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