64 Eridani

This article is about S Eridani. For s Eridani, see HD 16754.
64 Eridani

A light curve for S Eridani, adapted from Koen and Eyer (2002)[1]
Observation data
Epoch J2000      Equinox
Constellation Eridanus
Right ascension 04h 59m 55.73677s[2]
Declination −12° 32′ 14.6983″[2]
Apparent magnitude (V) 4.77[3]
Characteristics
Spectral type F0 V[4]
B−V color index 0.266[3]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)−8.9±4.2[6] km/s
Proper motion (μ) RA: +39.67[2] mas/yr
Dec.: −87.04[2] mas/yr
Parallax (π)12.0106 ± 0.2199 mas[7]
Distance272 ± 5 ly
(83 ± 2 pc)
Absolute magnitude (MV)0.03[8]
Details
Mass1.52[9] M☉
Luminosity80.17[8] L☉
Surface gravity (log g)3.37[9] cgs
Temperature7,346±250[9] K
Rotational velocity (v sin i)212[10] km/s
Age644[9] Myr
Other designations
64 Eri, S Eri, BD−12° 1047, HD 32045, HIP 23231, HR 1611, SAO 150064[11]
Database references
SIMBADdata

64 Eridani is a single,[12] yellow-white hued star in the constellation Eridanus having variable star designation S Eridani. It is faintly visible to the naked eye with an apparent visual magnitude of 4.77.[3] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 272 light years.[7] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.[6]

This is an F-type main-sequence star with a stellar classification of F0 V.[4] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[5] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.[13]

64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[10] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.[14] The star is an estimated 644 million years old with 1.5 times the mass of the Sun.[9] It is radiating 80[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 7,346 K.[9]

  1. ^ Cite error: The named reference Koen was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference tycho2 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Rodriguez2001 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference dr2 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  11. ^ "64 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-29.
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference belle2012 was invoked but never defined (see the help page).