Beta Aquilae

Beta Aquilae
Location of β Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 55m 18.79256s[1]
Declination +06° 24′ 24.3425″[1]
Apparent magnitude (V) 3.87 + 12.0[2]
Characteristics
Spectral type G9.5 IV[3] + M2.5 V[4]
U−B color index 0.48[5]
B−V color index 0.86[5]
R−I color index 0.49
Variable type Suspected
Astrometry
Radial velocity (Rv)−40.3±0.09[6] km/s
Proper motion (μ) RA: 45.27[1] mas/yr
Dec.: −481.91[1] mas/yr
Parallax (π)73.00 ± 0.20 mas[1]
Distance44.7 ± 0.1 ly
(13.70 ± 0.04 pc)
Absolute magnitude (MV)+3.03[7]
Details[8]
A
Mass1.26±0.18[9] M☉
Radius3.064±0.020 R☉
Luminosity5.60±0.17 L☉
Surface gravity (log g)3.54±0.14 cgs
Temperature5,071±37 K
Metallicity [Fe/H]−0.19±0.05 dex
Rotation5.08697±0.00031 d[10]
Rotational velocity (v sin i)22.28 km/s
Age9.6–11.4[11] Gyr
Other designations
Alshain, Alschairn, β Aql, 60 Aquilae, BD+06° 4357, FK5 749, GJ 771, HD 188512, HIP 98036, HR 7602, SAO 125235, WDS 19553+0624, LHS 5350a, LTT 15822
Database references
SIMBADdata
ARICNSdata

Beta Aquilae, Latinized from β Aquilae, is a triple star[12] system in the equatorial constellation of Aquila. It is visible to the naked eye as a point-like source with an apparent visual magnitude of 3.87.[2] Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 44.7 light-years from the Sun.[1] It is drifting closer to the Sun with a radial velocity of −40 km/s.[6]

Its two components are designated Beta Aquilae A (formally named Alshain /ælˈʃeɪn/, the traditional name for the system)[13][14] 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 Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Montes_et_al_2018 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Oja1986 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Rains2020 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference mnras405_3_1907 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Butkovskaya_et_al_2018 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference apj687 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Fuhrmann_et_al_2017 was invoked but never defined (see the help page).
  13. ^ 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.
  14. ^ "Naming Stars". IAU.org. Retrieved 3 March 2018.