Image of the day 10/11/2017

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SH2-129 & Ou4 Flying Bat & Squid Nebula

Technical card

Resolution: 3357x4199

Dates: Sept. 28, 2017Oct. 2, 2017

Frames:
Astrodon Ha 5nm: 60x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 509x240" (gain: 139.00) -20C bin 1x1

Integration: 37.9 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 9.11 days

Avg. Moon phase: 66.58%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 1757469

RA center: 317.365 degrees

DEC center: 60.159 degrees

Pixel scale: 2.315 arcsec/pixel

Orientation: 67.276 degrees

Field radius: 1.728 degrees

Locations: Future World Media Home Observatory, Taylor, MI, Michigan, United States

Description

Sharpless 129 is an H-alpha emission nebula commonly called the Flying Bat Nebula located in Cepheus very close to the famous IC 1396 (the nebula that contains the Elephant's Trunk). The large blue/green nebula inside it, which is over a degree long, is formally known as Ou4 but is colloquially called the Squid (or Giant Squid) Nebula. Ou4 is remarkable for having been discovered very recently, in 2011, by amateur astronomer Nicolas Outters (hence the "Ou" in "Ou4"). It was originally called a planetary nebula but is now thought to be some kind of bipolar outflow from the bright blue star at its center (which is HR 8119).

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Author

Douglas J Struble
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SH2-129 & Ou4 Flying Bat & Squid Nebula, Douglas J Struble