Epsilon Sagittarii information

ε Sagittarii
	Location of ε Sagittarii (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Sagittarius
Right ascension	18h 24m 10.31840s
Declination	–34° 23′ 04.6193″
Apparent magnitude (V)	+1.85
Characteristics
Spectral type	B9.5 III
U−B color index	+0.13
B−V color index	–0.03
Astrometry
Radial velocity (Rv)	–15 km/s
Proper motion (μ)	RA: –39.42 mas/yr ; Dec.: –124.20 mas/yr
Parallax (π)	22.76 ± 0.24 mas
Distance	143 ± 2 ly ; (43.9 ± 0.5 pc)
Absolute magnitude (MV)	–1.41
Details
ε Sgr A
Mass	3.515 ± 0.138 M☉
Radius	6.8 R☉
Luminosity	363 L☉
Surface gravity (log g)	4.50 cgs
Temperature	9,960 K
Rotational velocity (v sin i)	236 km/s
Age	232 Myr
ε Sgr B
Mass	0.95 M☉
Luminosity	0.89 L☉
Temperature	5,807 K
Other designations
	Kaus Australis, ε Sagittarii, ε Sgr, Epsilon Sgr, 20 Sagittarii, CCDM J18242-3423A, FK5 689, GC 25100, HD 169022, HIP 90185, HR 6879, IDS 18175-3427 A, PPM 297655, SAO 210091, WDS J18242-3423A
Database references
SIMBAD	data

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.

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^ 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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[Kunitzsch-10] 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-CSN-11] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000 Equinox J2000
Location of ε Sagittarii (circled)
Constellation	Sagittarius
Right ascension	18^h 24^m 10.31840^s^[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 (R_v)	–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 (M_V)	–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
Kaus Australis, ε Sagittarii, ε Sgr, Epsilon Sgr, 20 Sagittarii, CCDM J18242-3423A, FK5 689, GC 25100, HD 169022, HIP 90185, HR 6879, IDS 18175-3427 A, PPM 297655, SAO 210091, WDS J18242-3423A
Database references
SIMBAD	data

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