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Beta2 Sagittarii

For other stars with this Bayer designation, see β Sagittarii.
Beta2 Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Location of β2 Sagittarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 23m 13.13745s[1]
Declination −44° 47′ 59.2051″[1]
Apparent magnitude (V) +4.29[2]
Characteristics
Spectral type F2/3 V[3] or F2 III[4]
U−B color index +0.07[2]
B−V color index +0.34[2]
Astrometry
Radial velocity (Rv)+19.0[5] km/s
Proper motion (μ) RA: +93.45[1] mas/yr
Dec.: −54.09[1] mas/yr
Parallax (π)24.31 ± 0.19 mas[1]
Distance134 ± 1 ly
(41.1 ± 0.3 pc)
Absolute magnitude (MV)+1.20[6]
Details
Mass1.43[7] M☉
Luminosity20[8] L☉
Surface gravity (log g)3.57[7] cgs
Temperature7,035±239[7] K
Metallicity [Fe/H]−0.54[5] dex
Rotational velocity (v sin i)155[9] km/s
Age933[7] Myr
Other designations
Arkab Posterior, β2 Sgr, CD−45° 13171, HD 181623, HIP 95294, HR 7343, SAO 229654[10]
Database references
SIMBADdata

Beta2 Sagittarii (β2 Sagittarii, abbreviated Beta2 Sgr, β2 Sgr) is a star in the zodiac constellation of Sagittarius. It is visible to the naked eye, having an apparent visual magnitude of +4.29.[2] Based upon an annual parallax shift of 24.31 mas as seen from Earth,[1] it is located 134 light-years from the Sun.

Based upon variations in its proper motion, this is a probable astrometric binary system.[11] As such, its two components would be designated Beta2 Sagittarii A (officially named Arkab Posterior /ˈɑːrkæb pɒˈstɪəriər/, the traditional name of the system)[12][13] and B.

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Malaroda1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference belle2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ 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.
  13. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.

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Arkab Posterior AST Arkab Posterior German Arkab Posterior Spanish Arkab Posterior EU Beta2 Sagittarii French いて座ベータ2星 Japanese 아르카브 포스테리오르 Korean Arkab Posterior (Stär) LB Arkab Posterior Dutch Beta2 Sagittarii Polish

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