18 Aquarii

18 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 24m 11.49206s[1]
Declination −12° 52′ 41.1928″[1]
Apparent magnitude (V) 5.49[2]
Characteristics
Spectral type F0 V[3]
B−V color index +0.29[2]
Astrometry
Radial velocity (Rv)−3.0±6.9[4] km/s
Proper motion (μ) RA: +89.60[1] mas/yr
Dec.: +8.62[1] mas/yr
Parallax (π)21.23 ± 0.29 mas
Distance154 ± 2 ly
(47.1 ± 0.6 pc)
Absolute magnitude (MV)2.12[4]
Details
Mass1.54[5] M☉
Luminosity11.8[4] L☉
Surface gravity (log g)3.98[6] cgs
Temperature7,194[6] K
Metallicity [Fe/H]–0.16[6] dex
Rotational velocity (v sin i)138[7] km/s
Age480[5] Myr
Other designations
18 Aqr, BD−13° 5923, FK5 1562, HD 203705, HIP 105668, HR 8187, SAO 164364[8]
Database references
SIMBADdata

18 Aquarii is a single,[9] yellow-white hued star in the equatorial constellation of Aquarius. The designation is from the catalogue of English astronomer John Flamsteed, first published in 1712. The star is faintly visible to the naked eye with an apparent visual magnitude of 5.49[2] and is located about 154 light-years (47 parsecs) from Earth.[1]

This is an F-type main sequence star with a stellar classification of F0 V.[3] It is an estimated 480[5] million years old and has a high rate of spin with a projected rotational velocity of 138 km/s.[7] The star has 1.54[5] times the mass of the Sun and is radiating 11.8[4] times the Sun's luminosity from its photosphere at an effective temperature of 7,194 K.[6]

  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. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference aaa515_A11 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  8. ^ "18 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-02.
  9. ^ Cite error: The named reference derosa2014 was invoked but never defined (see the help page).