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Contains:  NGC 6939, NGC 6946
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Flying Geese Cluster, NGC 6938 and The Fireworks Galaxy NGC 6946, 


            Steven Bellavia
Flying Geese Cluster, NGC 6938 and The Fireworks Galaxy NGC 6946
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Flying Geese Cluster, NGC 6938 and The Fireworks Galaxy NGC 6946

Technical card

Imaging telescopes or lenses: William Optics Star 71 f/4.9

Imaging cameras: ZWO ASI183MC Pro

Mounts: Sky-Watcher EQ-6R Pro SynScan

Guiding telescopes or lenses: Agena Astro 50mm f/3.9 Guidescope

Guiding cameras: ASI224MC

Software: Pleiades Astrophoto PixInsight  ·  Stark Labs Nebulosity 4.2  ·  Annie's Astro Actions V7  ·  Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions  ·  Digital Photo Professional  ·  IDEIKI AstroPhotography Tool (APT)  ·  SharpCap Pro 3.2

Filters: Astronomik L2 UV/IR Cut

Dates:Oct. 4, 2019

Frames:Astronomik L2 UV/IR Cut: 40x180" (gain: 120.00) -15C bin 1x1

Integration: 2.0 hours

Darks: ~30

Avg. Moon age: 6.22 days

Avg. Moon phase: 37.79%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 20.00

Mean FWHM: 4.50

Temperature: 7.00

Basic astrometry details job: 2968242

RA center: 20h 33' 8"

DEC center: +60° 25' 4"

Pixel scale: 1.433 arcsec/pixel

Orientation: 182.309 degrees

Field radius: 1.076 degrees

Resolution: 4500x3000

Data source: Backyard


NGC 6939 (Cr 423, Mel 231), The Flying Geese Cluster, is an open cluster in the constellation Cepheus. It was discovered by William Herschel in 1798. The cluster appears close to the spiral galaxy NGC 6946. It is 3,860 light years away and it is over a billion years old.

NGC 6946 (C12, PGC 65001, UGC 11597, Arp 29) - The Fireworks Galaxy is a face-on intermediate spiral galaxy with a small bright nucleus. It is 25.2 million light years from Earth. Discovered by William Herschel on 9 September 1798, this well-studied galaxy has a diameter of approximately 40,000 light-years, about one-third of the Milky Way's size and it contains roughly half the number of stars as the Milky Way.
It is called the "Fireworks Galaxy" because it has an unusually high rate of supernovae production, with 10 discovered in the last 100 years, compared to our Milky Way galaxy, whose rate averages just one supernova event per century. This is the more remarkable as our Galaxy comprises twice as many stars

Both objects are in the constellation Cepheus, and appear as two patches of haze with small binoculars. Cluster NGC 6939 is included in the Herschel 400 Catalogue, and galaxy NGC 6946 is a Caldwell object, C12.


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Steven Bellavia
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Sky plot

Sky plot


Flying Geese Cluster, NGC 6938 and The Fireworks Galaxy NGC 6946, 


            Steven Bellavia