2 Sextantis

2 Sextantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hydra
Right ascension 09h 38m 27.28962s[1]
Declination +04° 38′ 57.4461″[1]
Apparent magnitude (V) 4.68[2]
Characteristics
Evolutionary stage giant
Spectral type K3 III[2]
B−V color index +1.310±0.033[3]
Astrometry
Radial velocity (Rv)+44.61±0.23[4] km/s
Proper motion (μ) RA: −163.18[1] mas/yr
Dec.: −50.88[1] mas/yr
Parallax (π)11.04 ± 0.27 mas[1]
Distance295 ± 7 ly
(91 ± 2 pc)
Absolute magnitude (MV)−0.10[3]
Details
Mass1.32[2] M☉
Radius24[4] R☉
Luminosity190.5[2] L☉
Surface gravity (log g)2.09±0.22[5] cgs
Temperature4,188±33[2] K
Metallicity [Fe/H]−0.30±0.09[5] dex
Rotational velocity (v sin i)3.0[4] km/s
Age4.58[2] Gyr
Other designations
2 Sex, BD+05° 2207, FK5 1249, HD 83425, HIP 47310, HR 3834, SAO 117821[6]
Database references
SIMBADdata

2 Sextantis is a single[7] star that is now in the equatorial constellation Hydra, located around 295 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.68.[2] This object is moving further from the Earth with a heliocentric radial velocity of +44.6 km/s.[4] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.173″ per year.[8]

This is a giant star with a stellar classification of K3 III,[2] which, at the age of 4.58[2] billion years old, has exhausted the hydrogen at its core and evolved away from the main sequence. The star has 1.32[2] times the mass of the Sun and has expanded to 24[4] times the Sun's radius. It is radiating 190.5[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,188 K.[2]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Alessandro2008 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Prugniel2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Lépine2005 was invoked but never defined (see the help page).