M101 – Pinwheel Galaxy

M101 – Pinwheel Galaxy

M101, the Pinwheel Galaxy, was discovered in 1781 by Pierre Mechain and is a spiral galaxy in the constellation Ursa Major (the Big Dipper) at a distance of 20 million light years. M101 is a large spiral with a diameter of about 170,000 light years across, but is asymmetrical due to gravitational interactions with five companion galaxies nearby. M101 shines at a magnitude of 7.8.

  • Date – April/May 2018
  • Location – Backyard
  • Telescope – Meade 8” SCT @ f/7 (1397 focal length)
  • Camera – ASI1600MM-C @ -15C
  • Guiding – Orion Starshoot Autoguider w/50mm Guidescope
  • Mount – Orion Atlas Pro AZ/EQ-G
  • Pixel Scale – 0.61″/pixel
  • Exposures (Gain 0, Offset 50)
    • Luminance: 155x180s
    • Red: 10x300s
    • Green: 12x300s
    • Blue: 14x300s
    • Total integration: 10.75 hours
  • Processing – PixInsight
 


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