Kappa Eridani

κ Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 02h 26m 59.12177s[1]
Declination −47° 42′ 13.8247″[1]
Apparent magnitude (V) 4.25[2]
Characteristics
Spectral type B7 IV[3]
U−B color index −0.50[2]
B−V color index −0.14[2]
Astrometry
Radial velocity (Rv)+25.5±0.5[4] km/s
Proper motion (μ) RA: +19.32[1] mas/yr
Dec.: −5.54[1] mas/yr
Parallax (π)6.42 ± 0.15 mas[1]
Distance510 ± 10 ly
(156 ± 4 pc)
Absolute magnitude (MV)−1.72[5]
Details[3]
Mass5.0±0.8 M☉
Radius6[6][7] R☉
Luminosity1,175 L☉
Surface gravity (log g)3.5±0.1 cgs
Temperature14,700±400 K
Metallicity [Fe/H]0.02±0.06[8] dex
Rotational velocity (v sin i)10±8 km/s
Age93 Myr
Other designations
κ Eri, CD-48° 637, FK5 86, HD 15371, HIP 11407, HR 721, SAO 215906.[9]
Database references
SIMBADdata

Kappa Eridani, Latinized from κ Eridani, is a solitary star in the constellation Eridanus. With an apparent visual magnitude of 4.25,[2] it is bright enough to be visible to the naked eye on a dark night. Based upon an annual parallax shift of 0.00642 arc seconds,[1] it is roughly 510 light years distant from the Sun.

This appears to be an evolving B-type subgiant star with a stellar classification of B7 IV.[3] The measured angular diameter is 0.346±0.008 mas.[8] At an estimated distance of Kappa Eridani, this yields a physical size of about six times the radius of the Sun.[6] It has five times the Sun's mass, and radiates 1,175 times the solar luminosity from its outer atmosphere at an effective temperature of 14,700 K. Kappa Eridani is spinning with a projected rotational velocity of 10 km/s and is around 93 million years old.[3]

  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 Levenhagen2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference cadars was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Niemczura2003 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).