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Epsilon Sagittarii
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
Spectral type B9.5 III
U-B color index -0.13
B-V color index -0.03
Variable type ?
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
Mass 5 M
Radius 7 R
Luminosity 375 L
Temperature 9,200 K
Metallicity ?
Rotation 140 km/s.
Age ? years
Other designations
Kaus Australis, 20 Sagittarii, HR 6879, HD 169022, SAO 210091, FK5 689, CCDM 18242-3423, HIP 90185.

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'.


  1. ^ a b c d e van Leeuwen, F. (2007). "HIP 90185". Hipparcos, the New Reduction. Retrieved 2009-12-12.  

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