68 Aquarii

This article is about g2 Aquarii. For other stars with this Bayer designation, see g Aquarii.
68 Aquarii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aquarius
Right ascension 22h 47m 33.12362s[1]
Declination −19° 36′ 48.1619″[1]
Apparent magnitude (V) 5.24[2]
Characteristics
Spectral type G8III
B−V color index +0.941±0.002[2]
Astrometry
Radial velocity (Rv)+24.54±0.27[2] km/s
Proper motion (μ) RA: −103.390[1] mas/yr
Dec.: −205.545[1] mas/yr
Parallax (π)12.0902 ± 0.1605 mas[1]
Distance270 ± 4 ly
(83 ± 1 pc)
Absolute magnitude (MV)0.78[2]
Details
Mass1.39[3] M☉
Radius10.05+0.35
−1.62[1] R☉
Luminosity58.5±0.9[1] L☉
Surface gravity (log g)2.8[4] cgs
Temperature5,036+461
−85[1] K
Metallicity [Fe/H]−0.43±0.02[2] dex
Rotational velocity (v sin i)0.0[4] km/s
Age3.79[3] Gyr
Other designations
68 Aqr, BD−20°6486, HD 215721, HIP 112529, HR 8670, SAO 165293, LTT 9194[5]
Database references
SIMBADdata

68 Aquarii is a single[6] star located 270 light years away from the Sun in the zodiac constellation of Aquarius. 68 Aquarii is its Flamsteed designation, though it also bears the Bayer designation of g2 Aquarii.[7] It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.24.[2] The object is moving further from the Earth with a heliocentric radial velocity of +24.5 km/s.[2]

This star is 3.79[3] billion years old with a stellar classification of G8 III,[8] indicating the star is a giant star that has exhausted the hydrogen at its core and expanded off the main sequence. It is a red clump giant,[9] which means it is on the horizontal branch and is generating energy through helium fusion at its core. It has 1.39[3] times the mass of the Sun and 10 times the Sun's radius. The star is radiating 59 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,036 K.[1]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Kostjuk2002 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).