Beta Aquarii

Beta Aquarii
Location of β Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 31m 33.53171s[1]
Declination –05° 34′ 16.2320″[1]
Apparent magnitude (V) 2.87[2]
Characteristics
Evolutionary stage Yellow supergiant
Spectral type G0 Ib[3]
U−B color index +0.58[2]
B−V color index +0.84[2]
Astrometry
Radial velocity (Rv)6.451±0.0627[4] km/s
Proper motion (μ) RA: +18.77[1] mas/yr
Dec.: −8.21[1] mas/yr
Parallax (π)5.9728 ± 0.2147 mas[5]
Distance541.55+18.39
−15.49 ly
(166.12+5.64
−4.75 pc)[6]
Absolute magnitude (MV)−3.04[7]
Details[8]
Mass4.97±0.10[8] – 6.3[9] M☉
Radius47.88+1.68
−1.81 R☉
Luminosity2046±180 L☉
Surface gravity (log g)2.05[10] cgs
Temperature5608±71 K
Metallicity [Fe/H]–0.03[11] dex
Rotational velocity (v sin i)6.3±1.3[12] km/s
Age56[9] – 110±10 Myr
Other designations
Sadalsuud, Saad el Sund, β Aqr, 22 Aqr, BD–06 5770, FK5 808, GC 30137, HD 204867, HIP 106278, HR 8232, SAO 145457, ADS 15050 A, CCDM J21316-0534A[13]
Database references
SIMBADdata

Beta Aquarii is a single[14] yellow supergiant star in the constellation of Aquarius. It has the official name Sadalsuud (/ˌsædəlˈsuːəd/)[15] and the Bayer designation β Aquarii, abbreviated Beta Aqr or β Aqr. Based upon parallax measurements obtained during the Hipparcos mission, this component is located at a distance of approximately 540 light years (165 parsecs) from the Sun.[1] It is drifting further away with a radial velocity of 6.5 km/s.[4] The star serves as an IAU radial velocity standard.[16]

  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).
  3. ^ Cite error: The named reference araa11_29 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  5. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  6. ^ Cite error: The named reference b-j was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference huang2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Baines2018 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference leonid was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aaa449_2_655 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa480_1_91 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference apj627_1_L53 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Scarfe1985 was invoked but never defined (see the help page).