Psi Eridani

ψ Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 05h 01m 26.34599s[1]
Declination −07° 10′ 26.2662″[1]
Apparent magnitude (V) 4.81[2]
Characteristics
Spectral type B3 V[3] or B3 IV[4]
U−B color index −0.75[2]
B−V color index −0.19[2]
Astrometry
Radial velocity (Rv)20.7±1.1[5] km/s
Proper motion (μ) RA: +1.71[1] mas/yr
Dec.: +6.29[1] mas/yr
Parallax (π)4.41 ± 0.23 mas[1]
Distance740 ± 40 ly
(230 ± 10 pc)
Absolute magnitude (MV)−1.97[6]
Details
Mass7.00±0.43[7] M☉
Radius4.5[8] R☉
Luminosity2,878[7] L☉
Surface gravity (log g)3.859±0.025[9] cgs
Temperature18,700[7] K
Rotational velocity (v sin i)52±8[3] km/s
Age31.6±0.6[10] Myr
Other designations
ψ Eri, BD−07° 948, 65 Eridani, HD 32249, HIP 23364, HR 1617, SAO 131700[11]
Database references
SIMBADdata

Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81,[2] it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds,[1] it is located roughly 740 light-years away from the Sun.

This is a B-type main-sequence star with a stellar classification of B3 V.[3] However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32[10] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[7] and it has around 4.5 times the Sun's radius.[8] Psi Eridani shines with 2,878[7] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[7]

  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 Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Braganca2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Huang2010 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).