Object: Constellation: Coordinates: Size: Brightness:
NGC 7479 Pegasus 23h05m / +1219' 4.1' x 3.1' 11.6mag

The beautiful barred spiral galaxy NGC 7479 in the constellation of Pegasus on October 18, 2017. NGC 7479 is 105 million light-years from Earth. It is a Seyfert galaxy undergoing starburst activity in the nucleus, the bar and and the outer arms. Seyfert galaxies are "active galaxies" containing a nucleus (core) with a very high surface brightness and strong emission in a wide range of the electromagnetic spectrum (emitting radio, infrared, visible, ultraviolet, X- and gamma rays). Seyfert galaxies have supermassive black holes at their centers which are surrounded by accretion discs of in-falling material. NGC 7479 was discovered by William Herschel in 1784 (source: Wikipedia).

Twenty-three exposures of 3 minutes at ISO 800 were stacked with no dark frame subtraction with Deep Sky Stacker (resulting in a 1 h 09 min exposure) and further processed in Photoshop.
Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).

Search chart for NGC 7479. Map © 2017 "The Mag-7 Star Atlas Project", www.siaris.net. Map is modified.
The Mag-7 Star Atlas Project map can be downloaded here .