Xi Eridani

ξ Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 04h 23m 40.85270s[1]
Declination −03° 44′ 43.6771″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type A2 V[3]
U−B color index +0.08[2]
B−V color index +0.08[2]
Astrometry
Radial velocity (Rv)−11.0[4] km/s
Proper motion (μ) RA: −47.36[1] mas/yr
Dec.: −54.91[1] mas/yr
Parallax (π)15.60 ± 0.25 mas[1]
Distance209 ± 3 ly
(64 ± 1 pc)
Absolute magnitude (MV)+1.59[5]
Details
Mass2.29[6] M☉
Radius2.2[7] R☉
Luminosity27.6[8] L☉
Surface gravity (log g)3.73[9] cgs
Temperature8,400[8] K
Rotational velocity (v sin i)194.3±2.3[3] km/s
Age450[6] Myr
Other designations
ξ Eri, BD−04° 818, 42 Eridani, FK5 1120, HD 27861, HIP 20507, HR 1383, SAO 131176.[10]
Database references
SIMBADdata

ξ Eridani (Latinised as Xi Eridani) is a solitary[6] star in the constellation Eridanus. With an apparent visual magnitude of 5.17,[2] it is faintly visible to the naked eye on a clear, dark night. Based upon an annual parallax shift of 0.00156 arcseconds,[1] it is located around 209 light years from the Sun. The star is considered a member of the Sirius supercluster.[5]

This is an ordinary A-type main sequence star with a stellar classification of A2 V,[3] indicating that it is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It is around 450[6] million years old and has a relatively high rate of rotation with a projected rotational velocity of 194 km/s.[3] The star has about 2.3 times the mass of the Sun,[6] 2.2 times the Sun's radius,[7] and radiates 27.6[8] times the solar luminosity from its outer atmosphere at an effective temperature of 8,400 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 c d Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Wielen1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Eggen1998 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference King2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).