Contains: NGC 6946
Getting plate-solving status, please wait...

NGC 6946 Fireworks Galaxy and SN 2017eaw

Technical card

Imaging telescope or lens: APM LZOS 130/780 f/6 LW CNC II 130mm APO

Imaging camera: FLI ML16200

Mount: Takahashi EM-200 Temma2

Guiding telescope or lens: Orion Deluxe 50mm MiniGuider

Guiding camera: Orion SSAG

Focal reducer: Riccardi Model 1 1.0x Flattener

Software: PixInsight 1.8.5TheSkyXPS CS6

Filters: Astrodon 5nm HalphaAstrodon Gen2I LRGB

Resolution: 2290x1636

Astrodon 5nm Halpha: 5x1200" -20C bin 1x1
Astrodon Gen2E Lum: 34x600" -20C bin 1x1
Astrodon Gen2E RGB: 26x600" -20C bin 1x1

Integration: 11.7 hours

Mean SQM: 21.59 job: 1721854

RA center: 308.713 degrees

DEC center: 60.157 degrees

Pixel scale: 0.776 arcsec/pixel

Orientation: 2.178 degrees

Field radius: 0.303 degrees


NGC 6946 (Fireworks Galaxy) with Supernova 2017eaw in the strong upper arm at about 1 o’clock. That is the 10th supernova going off in this galaxy in the last 100 years, leading to its common name. In contrast, the Milky Way is only good for one per century. The face-on galaxy is classified as an intermediate spiral starburst galaxy. It is about one-third of the size of the Milky Way and is at 22 million light-years distance in Cepheus and Cygnus.
This 11.7 hr HaLRGB was collected during three nights (6/24, 7/22, 7/29/2017) at a very dark site in Pinnacles National Park, CA (Bear Gulch Users Area on the East side) with SQM readings as high as 21.80 (a fellow imager got 21.90 at one point that night).

8/23/17 Version C: REPROCESSED with DRIZZLE plus new PI 1.8.5 features of: Local Normalization and Large-scale Pixel Rejection. Both this version and previous versions used PI 1.8.5 but previously with the new Photometric Color Calibration only. All three seem to be significant improvements of PI.






SN 2017eaw marked


Reprocessed using Local Normalization, Large-Scale Pixel Rejection in PI 1.8.5 and DRIZZLE (Lum only)

Sky plot

Sky plot


NGC 6946 Fireworks Galaxy and SN 2017eaw, jeffweiss9