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Contains:  Pin-wheel nebula, M 99, NGC 4254
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M99 Galaxy LRGB - March/April/May 2019, 


            Geof Lewis
M99 Galaxy LRGB - March/April/May 2019

M99 Galaxy LRGB - March/April/May 2019

Technical card

Resolution: 1631x1211

Dates:March 31, 2019April 1, 2019April 21, 2019April 25, 2019April 30, 2019May 1, 2019

Astronomik B 1.25" Type IIc: 22x300" -10C bin 2x2
Astronomik G 1.25" Type IIc: 21x300" -10C bin 2x2
Astronomik L 1.25" Type IIc: 36x300" -10C bin 2x2
Astronomik R 1.25" Type IIc: 21x300" -10C bin 2x2

Integration: 8.3 hours

Darks: ~20

Flats: ~20

Flat darks: ~20

Avg. Moon age: 23.41 days

Avg. Moon phase: 37.11%

Bortle Dark-Sky Scale: 3.33

Mean SQM: 21.25 job: 2684346

RA center: 184.704 degrees

DEC center: 14.420 degrees

Pixel scale: 0.858 arcsec/pixel

Orientation: 359.863 degrees

Field radius: 0.242 degrees

Data source: Backyard


Had a real struggle capturing data for this one due to a combination of many cloudy nights, poor seeing & transparancy on the clear nights and rapidly diminishing night skies due to the approaching onset of permanent astronomical twilight between mid May and late July. Many of the RGB subs were captured through high haze which made a mess of the background, so I had to work hard when processing to disguise that, before layering the sharpened luminence.



Geof Lewis
License: None (All rights reserved)

Sky plot

Sky plot


M99 Galaxy LRGB - March/April/May 2019, 


            Geof Lewis