Imaging telescopes or lenses: TS Optics APO130f6
Imaging cameras: ZWO ASI1600MM-Cool
Mounts: Ioptron CEM 120 EC2
Guiding telescopes or lenses: TS Optics APO130f6
Guiding cameras: Starlight Express Lodestar X2 Autoguider
Focal reducers: 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 · AstroDon 5nm Ha filter
Accessory: ZWO EFW 31mm 8 positions · QHYCCD PoleMaster · Innovations Foresight ONAG · USB_Focus V3 Usb Focus · USB Stepper Motor Heavy Load
Dates:April 29, 2019
Frames:
AstroDon 5nm Ha filter: 4x600" (gain: 0.00) -18C bin 1x1
ZWO new B: 10x120" (gain: 0.00) -18C bin 1x1
ZWO new G: 10x120" (gain: 0.00) -18C bin 1x1
ZWO new L: 30x120" (gain: 0.00) -18C bin 1x1
ZWO new R: 10x120" (gain: 0.00) -18C bin 1x1
Integration: 2.7 hours
Avg. Moon age: 24.43 days
Avg. Moon phase: 26.64%
Mean SQM: 21.20
Mean FWHM: 3.10
Temperature: 10.00
Astrometry.net job: 2719120
RA center: 12h 42' 47"
DEC center: +32° 20' 33"
Pixel scale: 0.911 arcsec/pixel
Orientation: 11.523 degrees
Field radius: 0.735 degrees
Resolution: 4651x3474
Locations: Duc, Prayssas, Lot et Garonne, France
Data source: Backyard
During this imaging session I did my first automated merian flip !!!!
It was an "attended" meridian flip, I was able to check that all was going very very well :
- At 0h11 (30 april) light frame n°24 ended and initiated the MF
- SGP performed a plate solve for "sync" current coordinates
- Mount move from W to E side of pier (PHD2 idsconneted at the same time)
- SGP performed Centering routine (in the Target Offset mode) and after 3 iterations obtained less than 5 pixels total error (5 arcsec).
- SGP relauch PHD2 in (my multi star) autoselect and stabilize guiding
- SGP performed auto focus routine (which pause guiding)
- At 0h17 : SGP initiate Light frame n°25
The total MF duration was 6 minutes.
Original image is LRGB without Ha.
I selected gain 0 (5e- / ADU) by mistake especially for the Ha frames which were RON dominated.
The processing was done in PI as follow (version original):
For each L, R ,G ,B and Ha channels :
- Flat Field Dark Substraction
- Flat Field Integration
- Images Calibration (Dark Substraction and FF correction)
- Cosmetic Correction
- Image Registration
- Image Integration
- DBE or ABE
- Deconvolution masked with 2.3 pixel psf
- TGV denoise for Light frame only
Then :
- Creating RGB image from RGB channels
- Color balance and Color saturation on stars of RGB
- Nonlinear Image Creation with L and RGB and Ha
- Extract R, g, b channels from RGB
- Created LRGB color image
- Add Ha to R in NL mode
- Created LRGBHa image
- Use clone stamp to clean some red artefacts coming from Ha channel adding
Final image adjustments performed in Iphoto on Imac (levels adjustments, +10% color sat, crop and deflip)
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