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Omicron Sagittarii : ウィキペディア英語版 | Omicron Sagittarii
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==
*This star sometimes called by the name Manubrium of Manubrij, from Latin manus ‘hand’, the star does appear to mark the Archer's right ear.〔(MANUBRIUM )〕 *In Chinese, (), 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 (, (英語:the Second Star of Establishment).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日 )〕
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