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2018-09-07 Omega/Swan/Horseshoe nebula (M17)
© Fabien COUTANT

2018-09-07 Omega/Swan/Horseshoe nebula (M17)

Yet another summer DSO catched in my early september sessions.

I find this looks like more a horseshoe than a swan; I have read the swan could be seen with a different orientation, and less exposure (such as Herschel's drawings).

Interesting facts: The nebula is estimated about 15 ly diameter at a distance of 5-6000 ly (~1/20 milky way diameter), and weights 800 solar masses; Its cluster hosts 800 stars, is forming another thousand in the outer regions, and would be aged "just" 1 million years.

Gear: Olympus E-PL6 with Skywatcher 130PDS 632mm/4.86 and SWCC at f/4.55 on Omegon EQ-300 tracking RA
Capture: 24 lights × 40s × 3200 ISO, master dark
Site: deep country 26km from Limoges, France
Sky: good (given bortle class 3, usual sqm >21), subject high enough for no LP
Processing: Regim 3.4, Fotoxx 12.01+


© Fabien COUTANT

From the album:

Other (Narrow field, DSO, EQ)

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Photo Information for 2018-09-07 Omega/Swan/Horseshoe nebula (M17)


  • 0 mm
  • 40/1
  • f f/1.0
  • ISO 3200
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