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Contains:  Maia nebula, Merope nebula, NGC 1432, NGC 1435, The star 18Tau, The star Atlas (27Tau), The star Celaeno (16Tau), The star Electra (17Tau), The star Merope (23Tau), The star Pleione (28Tau), The star Sterope I (21Tau), The star Taygeta (19Tau), The star ηTau
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LRGB - Pleiades (M45), 


            Min Xie
LRGB - Pleiades (M45)
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LRGB - Pleiades (M45)

Technical card

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

Imaging cameras: ASI1600mm Pro

Mounts: Celestron Advanced VX

Guiding telescopes or lenses: QHYCCD QHYOAG-S

Guiding cameras: QHYCCD QHY5II-M

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

Software: ProDigital Software StarSpikes Pro 4  ·  Adobe Photoshop CC 2016  ·  Astro Pixel Processor  ·  Sequence Generator Pro  ·  PixInsight 1.8 Ripley  ·  Adobe Lightroom 2017

Filters: 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:Nov. 16, 2018

Astrodon E Series Gen II Blue 31mm: 56x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Green 31mm: 50x60" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Lum 31mm: 60x30" (gain: 74.00) -20C bin 1x1
Astrodon E Series Gen II Red 31mm: 50x60" (gain: 74.00) -20C bin 1x1

Integration: 3.1 hours

Darks: ~30

Flats: ~30

Bias: ~80

Avg. Moon age: 8.18 days

Avg. Moon phase: 58.40%

Bortle Dark-Sky Scale: 3.00

Mean SQM: 21.85

Temperature: 5.00

Basic astrometry details job: 3248566

RA center: 3h 47' 0"

DEC center: +24° 6' 36"

Pixel scale: 4.364 arcsec/pixel

Orientation: 174.410 degrees

Field radius: 1.372 degrees

Resolution: 1920x1200

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

Data source: Traveller


Revisiting the targets started my Astrophotography hobby. M45 is the second target.

The moon was at 65%. It was so bright. Pleiades was about 90-degree away. But it definitely impact the SNR.

Got this feeling that the size of the stars - overall, not just the brightest ones - are much larger than the narrowband versions. Wondering why. But I do like the true star color from LRGB result comparing to the not so accurate narrowband combination.

Anyway... The stars are just.. fat.

Processing-wise, more practice needed to define the deringing star mask during Deconvolution. MultiscaleLinearTransformation is the king of reduce noise, level of control, ease of mask protection, no other ones come close.

Well, I tried to add Ha master but nothing obvious noticed. There is no Ha signal from the nebulosity in this area.



Min Xie
License: Attribution-NonCommercial Creative Commons

Sky plot

Sky plot


LRGB - Pleiades (M45), 


            Min Xie