Epsilon Sextantis

ε Sextantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 17m 37.80200s[1]
Declination −08° 04′ 08.0898″[1]
Apparent magnitude (V) 5.24[2]
Characteristics
Spectral type F0 IV[3]
U−B color index +0.09[2]
B−V color index +0.32[2]
Astrometry
Radial velocity (Rv)+15.2[4] km/s
Proper motion (μ) RA: −160.57[1] mas/yr
Dec.: +2.91[1] mas/yr
Parallax (π)16.86 ± 0.28 mas[1]
Distance193 ± 3 ly
(59.3 ± 1.0 pc)
Absolute magnitude (MV)2.42[5]
Details
Mass1.94[6] M☉
Radius3.14+0.18
−0.30[7] R☉
Luminosity23.24±0.55[7] L☉
Surface gravity (log g)3.83±0.08[8] cgs
Temperature7,166±88[8] K
Metallicity [Fe/H]+0.31±0.05[8] dex
Rotational velocity (v sin i)63.5±3.2[5] km/s
Age1.1[6] Gyr
Other designations
ε Sex, 22 Sextantis, BD−07°3001, FK5 1263, HD 89254, HIP 50414, HR 4042, SAO 137469[9]
Database references
SIMBADdata

Epsilon Sextantis, Latinized from ε Sextantis, is a solitary,[10] yellow-white hued star in the equatorial constellation of Sextans. With an apparent visual magnitude of 5.24,[2] it is faintly visible to the naked eye on a dark night. The distance to this star, based upon an annual parallax shift of 16.86 mas,[1] is about 193 light years. It is drifting further away from the Sun with a radial velocity of +15 km/s.[4]

This is an F-type subgiant star with a stellar classification of F0 IV.[3] However, Malaroda (1975) gave a classification of F2 III,[11] which would indicate a more evolved giant star. It is estimated to have nearly double the mass of the Sun[6] with 3.1[7] times the Sun's radius. The star is around 1.1 billion years old and has a projected rotational velocity of 63.5 km/s.[5] It is radiating 23[7] times the luminosity of the Sun from its photosphere at an effective temperature of 7,166 K.[8]

  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 c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Malaroda1975 was invoked but never defined (see the help page).