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Contains:  NGC 4657, NGC 4656, NGC 4631, NGC 4627
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Whale and Hockey Stick Galaxies - NGC4656 and NGC4631

Technical card

Resolution: 4580x3432

Dates:April 13, 2019

Baader Ha 7nm 36mm Baader: 61x300" (gain: 139.00) -20C bin 1x1
ZWO 36mm LRGBHOS Filter Set: 158x180" -20C bin 1x1

Integration: 13.0 hours

Avg. Moon age: 8.14 days

Avg. Moon phase: 58.07% job: 2645727

RA center: 190.749 degrees

DEC center: 32.365 degrees

Pixel scale: 0.784 arcsec/pixel

Orientation: 2.697 degrees

Field radius: 0.623 degrees

Locations: au Pied du Ventoux, Ventoux, 84, France

Data source: Backyard


The global full field with these 2 galaxies NGC4656 and NGC4631 the Hockey Stick and the Whale Galaxies.

After a fisrt pass with LRGB subs , I decided to add Halpha (6 hours) to get all the small clusters and nebulas and it worked fine for both galaxies !

3 nights were necessary to get the subs: 31/01 of march and 04/05, and 12/13 of april
Red 40 subs@180s -20°C gain zero
Blue 30 subs@180s -20°C gain zero
Green 29 subs@180s -20°C gain zero
Light 59subs@180s -20°C, gain zero
Halpha 61subs@180s -20°C, gain 139



Arnaud Peel
License: None (All rights reserved)

Sky plot

Sky plot


Whale and Hockey Stick Galaxies - NGC4656 and NGC4631, 


            Arnaud Peel