Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 63  ·  NGC 5055  ·  Sunflower Galaxy
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M63 in L(L)RGB, 



    
        

            Tom Gray
M63 in L(L)RGB
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M63 in L(L)RGB

Getting plate-solving status, please wait...
M63 in L(L)RGB, 



    
        

            Tom Gray
M63 in L(L)RGB
Powered byPixInsight

M63 in L(L)RGB

Technical card

Dates:April 4, 2021April 10, 2021

Frames:
Meade Blue Filter for CCD: 15x60" (15') bin 1x1
Meade Green Filter for CCD: 15x60" (15') bin 1x1
Meade RGB-IR Cut 1.25": 60x120" (2h) bin 1x1
Meade Red Filter for CCD: 15x60" (15') bin 1x1

Integration: 2h 45'

Darks: ~27

Flats: ~25

Avg. Moon age: 25.14 days

Avg. Moon phase: 25.78%


Basic astrometry details

Astrometry.net job: 4400012

RA center: 13h 15' 48"

DEC center: +42° 1' 55"

Pixel scale: 0.915 arcsec/pixel

Orientation: 355.748 degrees

Field radius: 0.198 degrees


Resolution: 1260x924

Locations: Home 'observatory' (Bortle 5), Derbyshire, United Kingdom

Data source: Backyard

Description

A composite of RGB frames (1x1 binning) added to my luminance frames from 4 April, and processed as L + synthetic L from RGB in Startools. Conditions limited exposures to 120s and Astrometric solving failed in ASTAP due to a lack of stars. As the L and RGB frames were taken at different focal lengths, I resorted to aligning, scaling and stacking in Nebulosity. As a result of messing with spacers, my F6.3 reducer flattener was not optimised and my flat fields were terrible, resulting in artifacts, gradients and vignetting.

Nevertheless when compared with my image taken on 4 April much more flocculation is visible, although I had to suppress the background to remove noise and gradients. Note to self, I need to work out the optimum back space for my focal reducers, collect more RGB frames to drive down the noise, and produce better flat frames. Longer exposures would allow me to go deeper and record sufficient stars for astrometric solving and better alignment in ASTAP.

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