NGC 18 is a double star system located in the constellation of Pegasus.[1] It was first recorded by Herman Schultz on 15 October 1866. It was looked for but not found by Édouard Stephan on 2 October 1882. It was independently observed by Guillaume Bigourdan in November 1886.[1]

Both stars are 2528±20 light-years away, and based on this distance have a minimum separation of approximately 2,700 astronomical units, an unusually wide separation for a binary system.

See also

References

  1. ^ a b c d e f Seligman, Courtney (March 2010). "NGC Objects: NGC 1 - 49". Celestial Atlas. Retrieved 27 October 2010.
  2. ^ "Pul-3 10207". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 January 2018.
  3. ^ "Pul-3 10208". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 January 2018.
  • Media related to NGC 18 at Wikimedia Commons
Allikas: https://en.wikipedia.org/wiki/NGC_18
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