| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 24m 10.32s [1] |
| Declination | –34° 23′ 04.6″ [1] |
| Apparent magnitude (V) | 1.79 |
| Characteristics | |
| Spectral type | B9.5 III |
| U−B color index | -0.13 |
| B−V color index | -0.03 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | -15 km/s |
| Proper motion (μ) | RA: -39.42 ± 0.22 [1] mas/yr Dec.: -124.20 ± 0.14 [1] mas/yr |
| Parallax (π) | 22.76 ± 0.24[1] mas |
| Distance | 143 ± 2 ly (43.9 ± 0.5 pc) |
| Absolute magnitude (MV) | -1.45 |
| Details | |
| Mass | 5 M☉ |
| Radius | 7 R☉ |
| Luminosity | 375 L☉ |
| Temperature | 9,200 K |
| Metallicity | ? |
| Rotation | 140 km/s. |
| Age | ? years |
| Other designations | |
Epsilon Sagittarii (ε Sgr, ε Sagittarii) is a binary star that lies 144.64 light-years distant in the constellation Sagittarius. It has a faint, 14th magnitude, companion, Epsilon Sagittarii B, 32 arcseconds distant.
The star forms the base of the archer's "bow" in Sagittarius and also marks the base of the spout of the so-called "Teapot" asterism. Its traditional name is Kaus Australis, from Arabic قوس qaws 'bow' and Latin austrālis 'southern'.
Its traditional name is Kaus Australis, from Arabic قوس qaws 'bow' and Latin austrālis 'southern'.
The traditional Chinese name for this star is 箕宿三 (Mandarin: qí xìu sān), the Third Star of the Winnowing Basket.
Kaus Australis is listed in MUL.APIN as MA.GUR8, meaning "the Bark".[2].
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