NGC 550 is a spiral galaxy in the constellation Cetus. It is estimated to be about 300 million light-years from the Milky Way and has a diameter of approximately 110,000 light years. The German-British astronomer William Herschel discovered it on 8 October 1785.
One supernova has been observed in NGC 550: SN 1961Q (type unknown, mag. 17.2) was discovered by Milton Humason on 30 November 1961.
See also List of NGC objects (1–1000)
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