page_title: Triangulum Galaxy
section_title: Properties
hierarchical_section_title: Triangulum Galaxy / Properties
caption_attribution_description: English: Telescope: Newton 10", mount: EQ6, kamera: Canon EOS 400Da, Coma Corrector: Baader MPCC 2", Filter: Baader Planetarium UHC-S, CLS 42 x 15min.
context_page_description: The Triangulum Galaxy is a spiral galaxy 2.73 million light-years from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Milky Way and the Andromeda Galaxy. It is one of the most distant permanent objects that can be viewed with the naked eye.
  The galaxy is the smallest spiral galaxy in the Local Group and is believed to be a satellite of the Andromeda Galaxy or on its rebound into the latter due to their interactions, velocities, and proximity to one another in the night sky. It also has an H II nucleus.
context_section_description: With a diameter of about 60,000 light-years, the Triangulum galaxy is the third largest member of the Local Group of galaxies, roughly 60% the size of the Milky Way. It may be a gravitationally bound companion of the Andromeda Galaxy. Triangulum may be home to 40 billion stars, compared to 400 billion for the Milky Way, and 1 trillion stars for Andromeda Galaxy.
  The disk of Triangulum has an estimated mass of (3–6) × 10⁹ solar masses, while the gas component is about 3.2 × 10⁹ solar masses. Thus the combined mass of all baryonic matter in the galaxy may be 10¹⁰ solar masses. The contribution of the dark matter component out to a radius of 55×10³ ly (17 kpc) is equivalent to about 5 × 10¹⁰ solar masses.
caption: Another image of Triangulum Galaxy made by an amateur telescope
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