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Contains:  IC 3311, M 84, M 86, M 87, NGC 4351, NGC 4374, NGC 4388, NGC 4402, NGC 4406, NGC 4413, NGC 4425, NGC 4431, NGC 4435, NGC 4438, NGC 4440, NGC 4461, NGC 4473, NGC 4477, NGC 4478, NGC 4486, The Eyes
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Markarian's Chain and M87, 


            Eshan Toorabally
Markarian's Chain and M87
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Markarian's Chain and M87

Technical card

Dates:March 25, 2019March 28, 2019March 29, 2019

Astrodon B Gen.2 E-series 36mm: 165x30" (gain: 139.00) -15C bin 1x1
Astrodon G Gen.2 E-series 36mm: 110x30" (gain: 139.00) -15C bin 1x1
Astrodon L Gen.2 E-series 36mm: 1050x15" (gain: 139.00) -15C bin 1x1
Astrodon R Gen.2 E-series 36mm: 92x60" (gain: 139.00) -15C bin 1x1

Integration: 8.2 hours

Darks: ~25

Flats: ~25

Flat darks: ~25

Avg. Moon age: 21.78 days

Avg. Moon phase: 53.53%

Bortle Dark-Sky Scale: 7.00

Basic astrometry details job: 2660430

RA center: 12h 27' 47"

DEC center: +13° 0' 43"

Pixel scale: 1.772 arcsec/pixel

Orientation: 1.045 degrees

Field radius: 1.385 degrees

Resolution: 4517x3357

Locations: Home, London, United Kingdom

Data source: Backyard


Markarian's Chain shot from my back garden over three nights in late March. Probably the deepest image I've taken in terms of integration time...which leaves me feeling my processing is not quite doing the data justice.

In any case, this is an incredible part of space; looking away from our galaxy reveals countless others!

The crazy number of Lum subs took a whole day for APP to chug through and so I've resolved to lower the gain from unity going forwards to get more manageable sub lengths than 15 seconds!

Captured using APT, stacked in APP and processed in Pixinsight.

Thanks for looking!



Eshan Toorabally
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

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Markarian's Chain and M87, 


            Eshan Toorabally