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Contains:  IC 3453, IC 3476, IC 3478, IC3453, IC3476, IC3478, M 88, M88, NGC 4501, NGC 4516, NGC4516
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Messier 88, 


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Messier 88

Imaging telescopes or lenses: CELESTRON EdgeHD 8

Imaging cameras: QHYCCD QHY8L

Mounts: Sky-Watcher NEQ-6 PRO GoTo SkyScan

Guiding telescopes or lenses: Skywatcher ED 80/600

Focal reducers: Celestron .7x

Software: EZCap  ·  PixInsight  ·  PHD Guiding 2.5.0

Accessory: Orion Starshoot Auto-Guider

Dates:April 4, 2014

Frames: 15x120" -10C bin 1x1

Integration: 0.5 hours

Flats: ~11

Bias: ~20

Avg. Moon age: 4.78 days

Avg. Moon phase: 23.68%

Mean SQM: 20.80

Mean FWHM: 3.20 job: 1105433

RA center: 12h 32' 12"

DEC center: +14° 25' 36"

Pixel scale: 1.076 arcsec/pixel

Orientation: 50.567 degrees

Field radius: 0.545 degrees

Resolution: 3040x2024

Locations: Duc, Prayssas, Lot et Garonne, France


I am processing some early data from 2014, when I was starting to use my new C8EHD.
I was constrained to 2 mn sub exposures maximum due to differential flexure with my parrallel guiding system.
I eventually realized that most of the flexure originated from the Orion XY Guide Star Finder !!!!

This specific picture is teh result of the selection of 15 out of 21 exposures (clouds and bad guiding).

Pre-processing done in Pixinsight :
- overscan area offset correction
- bias correction
- flat correction
- hot pixel correction
- debayer
- registration
- stack
Processing done in Pixinsight :
- backgroung color neutralisation
- color calibration using galaxy
- residual sky background substraction
- color saturation boost
- green neutral
- non linear image creation
Final image :
- jpeg calibration done in Mac Photo



License: None (All rights reserved)

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Messier 88,