Epsilon Sagittarii

ε Sagittarii
Location of ε Sagittarii (circled)
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]
Distance143 ± 2 ly
(43.9 ± 0.5 pc)
Absolute magnitude (MV)–1.41[5]
Details[6]
ε Sgr A
Mass3.80 M☉
Radius8.8 (equatorial)
6.01 (polar) R☉
Luminosity497 L☉
Surface gravity (log g)3.46 (polar)
2.00 (equatorial) cgs
Temperature11,720 (polar)
7,433 (equatorial)
9,950 (mean) K
Rotation1.61 days
Rotational velocity (v sin i)236[7] km/s
Age232[5] Myr
ε Sgr B
Mass0.95[5] M☉
Radius0.93[5][a] R☉
Luminosity0.891[5] L☉
Temperature5,808[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
SIMBADdata

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.

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference aaa372 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Bailey was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aaa393_897 was invoked but never defined (see the help page).
  8. ^ 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.
  9. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.


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