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Contains:  IC3280, IC3303, IC3344, IC3355, IC3382, IC3388, IC3393, M 84, M 86, M84, M86, NGC 4374, NGC 4387, NGC 4388, NGC 4402, NGC 4406, NGC 4425, NGC 4435, NGC 4438, NGC 4458, NGC 4459, NGC 4461, NGC 4473, NGC 4474, NGC 4477, NGC 4479, NGC4387, NGC4388, NGC4402, NGC4425, NGC4435, NGC4438, NGC4446, NGC4447, NGC4458, NGC4459, NGC4461, NGC4468, NGC4473, NGC4474, NGC4477, NGC4479, The Eyes
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A portion of Markarian's Chain LRGB, 


            Michael Feigenbaum
Powered byPixInsight

A portion of Markarian's Chain LRGB

Technical card

Dates:April 12, 2019April 13, 2019April 14, 2019

Baader UV/IR-Cut/L Filter: 152x120" (gain: 139.00) -15C
Astronomik Blue 1.25": 65x120" (gain: 139.00) -15C
Astronomik Green 1.25" CCD Filter: 60x120" (gain: 139.00) -15C
Astronomik Red 1.25": 90x120" (gain: 139.00) -15C

Integration: 12.2 hours

Darks: ~50

Flats: ~50

Bias: ~500

Avg. Moon age: 8.15 days

Avg. Moon phase: 57.99%

Bortle Dark-Sky Scale: 4.00 job: 2653656

RA center: 12h 27' 19"

DEC center: +13° 23' 6"

Pixel scale: 1.447 arcsec/pixel

Orientation: -13.955 degrees

Field radius: 1.027 degrees

Resolution: 4040x3132

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard


I have added the RGB to the previously published Luminance image I did.

There was a battle going on with the moon but I think I came out OK, just a few scrapes and bruises... I've got some artifacts in my stars that primarily affect the color, i.e. I see a color gradient actually within individual stars. I think this is somehow related to a mistake I am making when using the "Star Alignment" tool in PI. I will figure it out...

Will definitely revisit this one next year...

Comment and criticisms always welcome.



Michael Feigenbaum
License: None (All rights reserved)

Sky plot

Sky plot


A portion of Markarian's Chain LRGB, 


            Michael Feigenbaum

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