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Contains:  Crescent nebula, IC 1311, IC 1318, M 29, NGC 6888, NGC 6910, NGC 6913, NGC 6914, The star 34Cyg, The star 40Cyg, The star Sadr (γCyg), gamma Cyg nebula
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Sadr and The Butterfly, 


            Graeme Coates
Sadr and The Butterfly
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Sadr and The Butterfly

Technical card

Dates:Sept. 17, 2018

Frames:Baader Planetarium H-alpha 36mm, 7nm: 44x300" (gain: 200.00) -15C bin 1x1

Integration: 3.7 hours

Avg. Moon age: 7.86 days

Avg. Moon phase: 55.03%

Basic astrometry details job: 2635289

RA center: 20h 20' 55"

DEC center: +40° 20' 31"

Pixel scale: 8.178 arcsec/pixel

Orientation: 358.265 degrees

Field radius: 3.271 degrees

Resolution: 1702x2323

Locations: Home, Brighthampton, Oxfordshire, United Kingdom

Data source: Backyard


Sadr (Gamma Cygni) sits at the centre of the large asterism known commonly as the Northern Cross that makes up the constellation of Cygnus.

Just to the east (left) of Sadr, is the Butterfly Nebula, IC1318. This actually sits much further away from us than Sadr at ~5000 light years (Sadr is about 750 ly distant). The nebula appears split into two by a dark dust lane running E-W, catalogued as LDN 889.

3h40m total exposure (5min subs) with HDR Composition for bright stars (25x30sec).



Graeme Coates
License: None (All rights reserved)

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Sadr and The Butterfly, 


            Graeme Coates