Alpha Sagittarii

Alpha Sagittarii
Location of α Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 19h 23m 53.17483s[1]
Declination −40° 36′ 57.3705″[1]
Apparent magnitude (V) +3.97[2]
Characteristics
Spectral type B8 V[3]
U−B color index −0.33[2]
B−V color index −0.10[2]
Astrometry
Radial velocity (Rv)−0.7[4] km/s
Proper motion (μ) RA: +30.49[1] mas/yr
Dec.: −119.21[1] mas/yr
Parallax (π)17.94 ± 0.22 mas[1]
Distance182 ± 2 ly
(55.7 ± 0.7 pc)
Absolute magnitude (MV)+0.23[5]
Details
Mass2.95[6] M☉
Luminosity117[7] L☉
Surface gravity (log g)4.11[6] cgs
Temperature12,387±421[6] K
Metallicity [Fe/H]−0.02[8] dex
Rotational velocity (v sin i)71[6] km/s
Age33[6] Myr
Other designations
Rukbat, α Sgr, CD−40° 13245, FK5 728, GC 26737, HD 181869, HIP 95347, HR 7348, SAO 325060, PPM 353699
Database references
SIMBADdata

Alpha Sagittarii (α Sagittarii, abbreviated Alpha Sgr, α Sgr), also named Rukbat /ˈrʌkbæt/,[9][10] is a star in the constellation of Sagittarius.

  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 Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
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  6. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
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  9. ^ 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.
  10. ^ "IAU Catalog of Star Names". Retrieved July 28, 2016.