AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.
I agreeImaging telescope or lens:CELESTRON EdgeHD 8
Imaging camera:QHYCCD QHY8L
Mount:Sky-Watcher AZ-EQ6 Synscan
Guiding telescope or lens:CELESTRON EdgeHD 8
Software:Sequence Generator Pro , PixInsight , PHD Guiding 2.5.0
Accessories:Starlight Xpress Lodestar x2 , Starlight Xpress AO Unit , QHYCCD PoleMaster , Starizona MicroTouch Autofocuser , Innovations Foresight ONAG
Dates:Aug. 6, 2016 , Aug. 9, 2016 , Aug. 11, 2016
Frames: 48x900" -15C bin 1x1
Integration: 12.0 hours
Darks: ~7
Flats: ~5
Bias: ~50
Avg. Moon age: 5.95 days
Avg. Moon phase: 36.29%
Mean SQM: 21.20
Mean FWHM: 2.10
Temperature: 18.00
Astrometry.net job: 1245495
RA center: 22h 7' 50"
DEC center: +31° 21' 10"
Pixel scale: 0.762 arcsec/pixel
Orientation: 177.806 degrees
Field radius: 0.356 degrees
Resolution: 2810x1858
Locations: Duc, Prayssas, Lot et Garonne, France
FWHM measured in PI : 2.1 arcsec (Moffat 4) : the seeing was quite good on average, ranging between 3.0 to 1.6 arcsec on sub exposures
Equipment used :
first night : AO with OAG
2nd & 3rd nights : AO + ONAG (on axis guiding)
With the ONAG, the 133 mm back focus was not achieved (+/- 170 mm) ; slight increase in FWHM on the external part of the image can be detected. I am working on achieving exact BF.
I will publish map of FWHM with unadjusted BF for information.
The combination of AO & ONAG is very effective and easy to use. I still have some trouble tuning the "bump" parameter in PHD, but OK overall.
Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- dark correction using 7 x 1800 s darks
- flat correction
- hot pixel correction
- debayer
- registration
- stack
- crop
Processing done in Pixinsight :
- backgroung color neutralisation
- color calibration using galaxy
- sky background removal (DBE in PI)
- slight deconvolution
- non linear image creation
- TGV denoise (no mask)
- color saturation boost masked
- green neutral
Final image :
- jpeg calibration done in Mac Photo (levels adjust and further saturation boost and color balance)
Comments