Beta Sagittae
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 Location of β Sagittae (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 41m 02.9393s[1] |
| Declination | +17° 28′ 33.748″[1] |
| Apparent magnitude (V) | 4.387[1] |
| Characteristics | |
| Spectral type | G8IIIa[1] |
| U−B color index | +0.89[2] |
| B−V color index | +1.05[2] |
| R−I color index | +0.50[2] |
| Astrometry | |
| Radial velocity (Rv) | −22.4 ± 0.9[1] km/s |
| Proper motion (μ) | RA: 9.06[1] mas/yr Dec.: −33.90[1] mas/yr |
| Parallax (π) | 6.99 ± 0.67[1] mas |
| Distance | 470 ± 40 ly (140 ± 10 pc) |
| Absolute magnitude (MV) | –1.39+0.22 −0.20[3] |
| Details | |
| Radius | 10[4] R☉ |
| Surface gravity (log g) | 2.79[3] cgs |
| Temperature | 4,850[3] K |
| Metallicity [Fe/H] | –0.03[3] dex |
| Rotational velocity (v sin i) | 9.1 ± 0.[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Sagittae (Beta Sge, β Sagittae, β Sge) is a G-type giant star in the constellation of Sagitta.[1] It has an apparent visual magnitude of approximately 4.387.[1]
Beta Sagittae projected Galactic orbit carries it between 18,400 and 24,100 light years from the center of the Galaxy. [5]
Beta Sagittae will come closest to the Sun 3.0 million years from now when it will brighten to magnitude 3.64 from a distance of 310 light years. [5]
Naming
In Chinese, 左旗 (Zuǒ Qí), meaning Left Flag, refers to an asterism consisting of β Sagittae, α Sagittae, δ Sagittae, ζ Sagittae, γ Sagittae, 13 Sagittae, 11 Sagittae, 14 Sagittae and ρ Aquilae. Consequently, β Sagittae itself is known as 左旗二 (Zuǒ Qí èr, English: the Second Star of Left Flag.)[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 * bet Sge -- Star, database entry, SIMBAD. Accessed on line October 13, 2010.
- ↑ 2.0 2.1 2.2 HR 7488, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line October 13, 2010.
- ↑ 3.0 3.1 3.2 3.3 3.4 Carney, Bruce W. et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal 135 (3): 892–906, arXiv:0711.4984, Bibcode:2008AJ....135..892C, doi:10.1088/0004-6256/135/3/892
- ↑ HD 185958, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line October 13, 2010.
- ↑ 5.0 5.1 Beta Sagittae (HIP 96837)
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
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