M33 – Triangulum Galaxy (LRGB)

M33 – Triangulum Galaxy

M33, the Triangulum Galaxy, is a spiral galaxy 2.73 million light years from Earth in the Triangulum constellation. It is the third largest member of the Local Group of galaxies after the Milky Way and Andromeda. It was first discovered by Giovanni Hodierna in 1654. M33 is thought to be a satellite of the Andromeda Galaxy. They are linked by a stream of hydrogen and stars that suggest an interaction sometime in the last 8 billion years and a potentially violent encounter 2.5 billion years in the future.

  • Date – 1/5/6/19 January 2020
  • Location – Backyard
  • Telescope – AT130EDT @ f/5.6 (728mm focal length)
  • Camera – ASI1600MM-C @ -10C
  • Guiding – ASI120MM-Mini / ZWO OAG
  • Mount – Orion Atlas Pro AZ/EQ-G
  • Pixel Scale – 1.08″/pixel
  • Exposures
    • Ha: 21x300s (Gain 200, Offset 50)
    • Lum: 173x60s (Gain 76, Offset 50)
    • Red: 20x180s (Gain 76, Offset 50)
    • Green: 20x180s (Gain 76, Offset 50)
    • Blue: 20x180s (Gain 76, Offset 50)
    • Total integration: 7.7 hours
  • Processing – PixInsight (M33_HaLRGB_20200101_Processing)


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