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Contains:  Great Nebula in Andromeda, M 110, M 31, M 32, NGC 205, NGC 221, NGC 224, The star νAnd
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HaLRGB - M31 - Andromeda Galaxy, 


            Min Xie
HaLRGB - M31 - Andromeda Galaxy
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HaLRGB - M31 - Andromeda Galaxy

Technical card

Imaging telescopes or lenses: William Optics Gran Turismo 81 APO (2018)  ·  William Optics Camera Angle Rotator  ·  Celestron StarSense

Imaging cameras: ASI1600mm Pro

Mounts: Celestron Advanced VX

Guiding telescopes or lenses: QHYCCD PoleMaster  ·  QHYCCD QHYOAG-S

Guiding cameras: QHYCCD QHY5II-M

Focal reducers: William Optics Flat6A-II (x0.80)

Software: ProDigital Software Astronomy Tools Actions Set  ·  Adobe Photoshop CC 2016  ·  Astro Pixel Processor  ·  Sequence Generator Pro  ·  PixInsight 1.8 Ripley  ·  Adobe Lightroom 2017

Filters: Astrodon 3nm Ha 31mm  ·  Astrodon E Series Gen II Blue 31mm  ·  Astrodon E Series Gen II Red 31mm  ·  Astrodon E Series Gen II Lum 31mm  ·  Astrodon E Series Gen II Green 31mm

Accessory: PrimaLuceLab Sesto Senso Robotic Focusing Motor  ·  ZWO EFW  ·  Celestron SkySync GPS  ·  Kingdel NC860 (i7-8550U)

Dates:Oct. 26, 2018Nov. 2, 2018Nov. 3, 2018

Astrodon 3nm Ha 31mm: 70x180" (gain: 200.00) -20C bin 1x1
Astrodon E Series Gen II Blue 31mm: 36x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Green 31mm: 40x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Lum 31mm: 90x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Red 31mm: 37x60" (gain: 74.00) -20C bin 1x1

Integration: 6.9 hours

Darks: ~30

Flats: ~40

Bias: ~80

Avg. Moon age: 21.95 days

Avg. Moon phase: 48.77%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 18.00

Temperature: 11.00

Basic astrometry details job: 3248578

RA center: 0h 44' 13"

DEC center: +41° 14' 20"

Pixel scale: 2.890 arcsec/pixel

Orientation: 5.835 degrees

Field radius: 1.454 degrees

Resolution: 3072x1920

Locations: TAS Atoka Dark Site, Atoka, Oklahoma, United States

Data source: Backyard


M31 was the first target when I got into this hobby exactly one year ago. Still remember the struggle of finding this target in the Nikon D500 live view window. The first result was just nothing - but at that time, it really made me excited for couple of days.

A year later, I decided to revisit to M31. It does mean a lot to this hobby of mine. Actually it took quite long time for me to collect the data, H-Alpha was captured in the white zone backyard. L/R/G/B was captured at TAS Atoka dark site.

It's also my first attempt to do a HaLRGB. Indeed clueless... Not sure how I made it out.

Clear Skies!



Min Xie
License: Attribution-NonCommercial Creative Commons

Sky plot

Sky plot


HaLRGB - M31 - Andromeda Galaxy, 


            Min Xie