"Fireworks galaxy" NGC 6946 and new supernoave 2017eaw

Object Information:

NGC 6946, the Fireworks Galaxy, is an intermediate spiral galaxy about 22 million light-years away, in the constellations Cepheus and Cygnus. In the Catalogue of Named Galaxies, it is called 'Pyrobolus Cygni', or the "Fireworks Galaxy", because of the record number of supernovae discovered in it. It was discovered by William Herschel on 9 September 1798. NGC 6946 is highly obscured by interstellar matter of the Milky Way galaxy, as it is quite close to the galactic plane. The true diameter of the galaxy is approximately 40,000 light-years or just about one-third of the Milky Way's size.

Ten supernovae have been observed in NGC 6946 in the last 100 years: SN 1917ASN 1939C, SN 1948B, SN 1968D, SN 1969P, SN 1980K, SN 2002hh, SN 2004et, SN 2008S, and SN 2017eaw. This makes it the most prolific known galaxy for this type of event over a period of 100 years. By comparison, the Milky Way galaxy, which has double the number of stars as NGC 6946, averages one supernova event per century. It also contains a failed supernova, potential black hole-forming star N6946-BH1

In this image you can also see the open cluster NGC 6939.

Here the whole image (wide field):

Exposure Information:

2h40 minutes exposure

Lights: 31x200" 0 Gain bin1

RGB: 15x90" 0 Gain bin 2

Darks: 30
Flats: no
Bias: no

Sensor temperature -20ºC
Moon phase 0%

Imaged at: Prades, Tarragona, CATALUNYA - SPAIN

Optics - Takahashi FSQ 85 - Focal lenght: 450mm - Diameter: 85mm
Camera - ASI 1600 MM-Cooled + ZWO 8pos 31mm Filter Wheel + ZWO OAG

Mount - Mesu 200
Guiding and planetary camera – ASI 174MC

Software: Sequence Generator Pro (SGP), PHD2, DSS, PIX

Image date: May 20th to 27th, 2017