Barred spiral galaxy in the constellation Cepheus
NGC 6946 or Arp 29 or Fireworks Galaxy is a Hubble-type SAB(rs)cd barred spiral galaxy in the constellation Cepheus at the boundary of the constellation Cygnus in the northern starry sky.
| Object: | NGC 6946 |
| Date of exposures: | 17.07.2021, 22.07.2021, 29.07.2021, 10.08.2021 |
| Distance: | 21 Mio. Lightyears |
| Exposures: | Luminance: 67 x 180", RGB: 205 x 180", Sum: 13,5 hrs |
| Telescope: | 10'', F4 Newton |
| Focal length: | 1000 mm |
| Filter: | Astrodon LRGB E-Series |
| Camera: | ASI 1600 MMC Pro |
| Guiding: | Off Axis Guider, Lodestar |
| Mount: | EQ8 |
The galaxy is close to our galactic plane, so the light coming to us from NGC 6946 is strongly obscured by gas and dust from our galaxy. This makes it difficult to photograph this galaxy and its members, and especially to determine their distance. In particular, from the supernova observations their distance should be determined, for which besides the apparent brightness and the absolute brightness also the interstellar extinction must be known.
Here is a crop of the original field:
A calculation published in 1997 gave a photometric distance of 6.4 megaparsecs (21 million light years). Other measurements gave values between 4.1 and 10.5 megaparsecs. NGC 6946 leads the statistics of supernova frequencies in the last hundred years with a number of ten.
I myself could photograph the last supernova (2017eaw) also with a few frames:
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Jens Zippel
c/o eWerk GmbH
Konsul-Smidt-Str. 24
28217 Bremen, Germany
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E-Mail: jens@spaceimages.de
Phone: +49 (0) 421 3351360
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