Omicron Sagittarii
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 19h 04m 40.98s [1] |
| Declination | −21° 44′ 29.4″ [1] |
| Apparent magnitude (V) | +3.76 |
| Characteristics | |
| Spectral type | K0III |
| Astrometry | |
| Proper motion (μ) | RA: 76.35 ± 0.31 [1] mas/yr Dec.: −58.12 ± 0.18 [1] mas/yr |
| Parallax (π) | 22.96 ± 0.24[1] mas |
| Distance | 142 ± 1 ly (43.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.61 |
| Other designations | |
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[1] 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.[2]
- 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.)[3]
References
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