Epsilon Sagittarii
Binary star in the constellation Sagittarius / From Wikipedia, the free encyclopedia
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Epsilon Sagittarii (Latinised from ε Sagittarii, abbreviated Epsilon Sgr, ε Sgr), formally named Kaus Australis /ˈkɔːs ɔːˈstreɪlɪs/,[10][11] 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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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 | |
ε Sgr A | |
Mass | 3.515 ± 0.138[5] M☉ |
Radius | 6.8[6] R☉ |
Luminosity | 363[5] L☉ |
Surface gravity (log g) | 4.50[7] cgs |
Temperature | 9,960[8] K |
Rotational velocity (v sin i) | 236[9] km/s |
Age | 232[5] Myr |
ε Sgr B | |
Mass | 0.95[5] M☉ |
Luminosity | 0.89[5] L☉ |
Temperature | 5,807[5] K |
Other designations | |
Database references | |
SIMBAD | data |
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