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Omicron Sagittarii

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Magnitude
  
3.76

Apparent magnitude (V)
  
3.76

Constellation
  
Sagittarius

Omicron Sagittarii httpsuploadwikimediaorgwikipediacommonsthu

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Omicron Sagittarii (Omicron Sgr, ο Sagittarii, ο Sgr) is a binary star in the constellation Sagittarius. ο Sagittarii is located 142 light years from Earth and is a spectral type K0 orange giant with an apparent magnitude of +3.77. It has a faint, 13th magnitude companion, ο Sagittarii B, 36 arc seconds away.

Because it is close to the ecliptic, ο Sagittarii can be occulted by the Moon and very rarely by planets. The last occultation of ο Sagittarii by a planet took place on 24 December 1937, when it was occulted by Mercury.

Name and etymology

  • In Chinese, 建 (Jiàn), meaning Establishment, refers to an asterism consisting of ο Sagittarii ξ² Sagittarii, π Sagittarii, 43 Sagittarii, ρ¹ Sagittarii and υ Sagittarii. Consequently, ο Sagittarii itself is known as 建二 (Jiàn èr, English: the Second Star of Establishment.)

    • References

    Omicron Sagittarii Wikipedia
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