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Observatory Parameters
Nov 19
Clouds: Seeing:
Waxing Crescent
07:46 18:04
NGC 660 is a representative of the rare class of galaxies known as polar ring galaxies. Galaxies of this type are thought to be the result either of a perpendicular collision of two galaxies or of a close pass that tidally strips material from one, which then forms a ring around the other. The central portion of NGC 660 is a lenticular galaxy. As many as 5% of lenticulars might have polar rings at some point in their lifetimes. NGC 660 was well positioned in my skies during this imaging session to provide me with the opportunity to acquire 3.5 hours of integration time. I was not sure that this would be sufficient time to allow me to pull its ring out of the background light pollution. I was pleasantly surprised to see how much of the ring I was able to resolve.
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NGC 660, Astrophotography by georgemsimon


  • Imaging telescope / lens: TPO/GSO Newtonian 150/900 mm Imaging Newtonian
  • Imaging camera: Canon 1100D (CMOS)
  • Mount: Equatorial Sky-Watcher EQ-6
  • Guiding telescope / lens: Orion Refractor 50/162 mm Mini 50mm Guide Scope
  • Guiding camera: Orion Star Shoot Autoguider
  • Accessories: Coma corrector Baader Planetarium 2.00"
  • Processed with: BackyardEOS 3.1.16
    PHD Guiding (Stark Labs) 2.6.4dev4
    Nebulosity (Stark Labs) 3.3.3
    GIMP (GNU Image Manipulation Program) 2.9.6

Frames / Subs

  • Lights: 140 x 90 sec
  • Darks: 16 x 90 sec
  • Flats: 50
  • Bias: 50
  • Total integration time: 3:54 hours


  • Date: Tue Oct 17th 2017
  • Seeing: 3 / 5
  • Transparency: 4 / 5
  • Sky darkness: 6 / 9
  • Ambient temperature: 10.0 ºC
  • ISO: 800

Spatial Info

  • Image Size: 1,262 x 845 pixels
  • Image Scale: 3.316 arcsec / pixel
  • Visual Field: 1º 09' 40''
  • RA Center: 1h 43m 02s
  • DEC Center: 13º 38' 31''
  • Orientation: -8.932 degrees E of N

Sky Maps



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