M57 – Ring Nebula

M57 – Ring Nebula

M57, the Ring Nebula, is a bright planetary nebula in the constellation Lyra. M57 was formed when a red giant star shed its outer layers of gas on its way to becoming a white dwarf. It was discovered in 1779 by Charles Messier. The white dwarf remnant can be seen in the center of the nebula shining at a dim magnitude 15, as opposed to the nebula at magnitude 8.8. M57 is located 2,200 light years from Earth and is still expanding at a rate of approximately one arcsecond per century, which corresponds to a velocity of about 20-30 km/s.

  • Date – 10 July 2017
  • Location – Backyard
  • Telescope – Meade 8” SCT @ f/6.3 (1320 focal length)
  • Camera – ASI224MC
  • Guiding – Orion Starshoot Autoguider w/50mm Guidescope
  • Mount – Orion Atlas Pro AZ/EQ-G
  • Pixel Scale – 0.61″/pixel
  • Exposures (Gain 375)
    • 500×2.5s
    • Total integration: 21 minutes
  • Processing – PixInsight
 


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