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Messier 101 revisited, 


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Messier 101 revisited

Imaging telescopes or lenses: TS Optics APO130f6  ·  CELESTRON EdgeHD 8

Imaging cameras: QHYCCD QHY8L  ·  ZWO ASI1600MM-Cool

Mounts: Sky-Watcher NEQ-6 PRO GoTo SkyScan  ·  Ioptron CEM 120 EC2

Guiding telescopes or lenses: TS Optics APO130f6  ·  CELESTRON EdgeHD 8

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 L  ·  AstroDon 5nm Ha filter

Accessory: ZWO EFW 31mm 8 positions  ·  Starlight Xpress AO Unit  ·  QHYCCD PoleMaster  ·  Innovations Foresight ONAG  ·  USB_Focus V3 Usb Focus  ·  USB Stepper Motor Heavy Load

Dates:May 9, 2015April 30, 2019May 4, 2019May 29, 2019

AstroDon 5nm Ha filter: 7x600" (gain: 0.00) -18C bin 1x1
AstroDon 5nm Ha filter: 4x600" (gain: 139.00) -21C bin 1x1
ZWO new L: 36x120" (gain: 0.00) -18C bin 1x1
ZWO new L: 15x120" (gain: 139.00) -21C bin 1x1

Integration: 15.4 hours

Avg. Moon age: 24.80 days

Avg. Moon phase: 28.61%

Astrometry.net job: 2745125

RA center: 14h 3' 14"

DEC center: +54° 20' 46"

Pixel scale: 0.759 arcsec/pixel

Orientation: 97.953 degrees

Field radius: 0.371 degrees

Resolution: 2906x1994

Locations: Duc, Prayssas, Lot et Garonne, France

Data source: Backyard


I have taken some Lum and Ha exposure with my APO and ASI1600mm set-up and combine them to 2015 single shot color exposure from 2105 (71x600" -15C bin 1x1 ).

The process was as follows in PI:
- I took the 2015 linear image (after integration and DBE)
- I Extract the CIE L*a*b channels

- I performed the usual preprocessing for the 2019 data to produce integrated linear image in L and Ha channels

- I did a weigheted integration of the L channel from 2015 data and Lum channel from the 2019 data using integration in PI
- I recombined channels in a collor image

- when NL for both the color image and the Ha image
- I slip the color image in RGB channels
- I add (with some weighting) the R and Ha channels
- I recombined the resulting RGB channels
- Green removal using SCNR
- Color Saturation with mask to protect background
- TGV noise removal
- Local Histogram Equalization

Final adjustement on iMac Photos

The 2 other versions are :
- D : did a masked strech instead of a pure Histo Transform
- E : using the full field of 2019 image, but not all the image is colored



License: None (All rights reserved)


  • Final
    Messier 101 revisited, 


  • Messier 101 revisited, 


  • Messier 101 revisited, 




Description: LHEq


Description: Full Frame - only partialy colored

Sky plot

Sky plot


Messier 101 revisited,