NGC 6946

Click on the image to display it full screen

Observation place
New Mexico


TelescopeTakahashi Epsilon 250 - 10 “, 850mm FL @ f / 3.4
MountParamount ME
Imaging cameraSBIG ST10XME - Non Anti Bloomin Gate (NABG) regulated at -10o Celsius
Image typeLHa (RHaVsB) (Vs for synghetic green)
LHa: Luminance using the clear filter + the Ha filter
RHa: Red layer using red filter + Ha filter
This composition was used to bring out emission nebulae in the galaxy
ExhibitionLuminance (10 x 5 'bin 1 × 1), Ha (10 x 5' bin 1 × 1) R (10 x 1 'bin 2 × 2) and B (10 x 1' bin 2 × 2)
PretreatmentMaxim DL
TreatmentPhotoshop and PixInsight
Specific treatmentCreate a synthetic green image

Object description

Object typeSpiral Galaxy “The Galaxy of Fireworks”
Visual magnitude8,8
Surface gloss14
Distance22 million light years
Diameter40000 light years
Dimension seen from Earth11,4 ′ x 10,8 ′ of arc
NGC 6946, nicknamed the Fireworks Galaxy, is a spiral galaxy seen almost face-on. Straddling the constellations of Cygnus and Cepheus, it is located at a distance of about 22 million light-years. Its diameter is about 40000 light-years. It was discovered by William Herschel on September 9, 1798.
This galaxy is the seat of “frequent” supernovae (explosion of a star at the end of its life), ten having been observed since 1917. NGC6946 also presents regions of star formation.
In low light pollution skies, NGC6946 is easy to see, even in a small telescope. It then appears as a diffuse oval mist.
My image of the firework galaxy was taken in a sky with no light pollution (in New Mexico). In an effort to bring out star-forming regions (places where there are emission nebulae), I incorporated a Hydrogen-Alpha filter into my image series, which helped bring out those regions. which appear in pink tones in the galaxy image.
Richard Beauregard
Sky Astro - CCD
My impression "We cannot be alone in this gigantic universe"