Back Epsilon Sagittarii Afrikaans القوس الجنوبي Arabic Kaus Australis AST Kaus Australis Catalan Kaus Australis Czech Kaus Australis German Kaus Australis Spanish Kaus Australis Basque قوس جنوبی Persian Epsilon Sagittarii Finnish
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 24m 10.31840s[1] |
| Declination | –34° 23′ 04.6193″[1] |
| Apparent magnitude (V) | +1.85[2] |
| Characteristics | |
| Spectral type | B9.5 III[3] |
| U−B color index | +0.13[2] |
| B−V color index | –0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | –15[4] km/s |
| Proper motion (μ) | RA: –39.42[1] mas/yr Dec.: –124.20[1] mas/yr |
| Parallax (π) | 22.76 ± 0.24 mas[1] |
| Distance | 143 ± 2 ly (43.9 ± 0.5 pc) |
| Absolute magnitude (MV) | –1.41[5] |
| Details[6] | |
| ε Sgr A | |
| Mass | 3.80 M☉ |
| Radius | 8.80 (equatorial) 6.01 (polar) R☉ |
| Luminosity | 497 L☉ |
| Surface gravity (log g) | 3.46 (polar) 2.00 (equatorial) cgs |
| Temperature | 11,720 (polar) 7,433 (equatorial) K |
| Rotation | 1.61 days |
| Rotational velocity (v sin i) | 236[7] km/s |
| Age | 232[5] Myr |
| ε Sgr B | |
| Mass | 0.95[5] M☉ |
| Radius | 0.93[5][a] R☉ |
| Luminosity | 0.891[5] L☉ |
| Temperature | 5,808[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Sagittarii (Latinised from ε Sagittarii, abbreviated Epsilon Sgr, ε Sgr), formally named Kaus Australis /ˈkɔːs ɔːˈstreɪlɪs/,[8][9] is a binary star system in the southern zodiac constellation of Sagittarius. The apparent visual magnitude of +1.85[2] makes it the brightest object in Sagittarius. Based upon parallax measurements, this star is around 143 light-years (44 parsecs) from the Sun.
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aaa393_897was invoked but never defined (see the help page). - ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
- ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
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