| |
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h59m 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] |
| Distance | 272 ± 5 ly (83 ± 2 pc) |
| Absolute magnitude (MV) | 0.03[8] |
| Details | |
| Mass | 1.52[9] M☉ |
| Luminosity | 80.17[8] L☉ |
| Surface gravity (log g) | 3.37[9] cgs |
| Temperature | 7,346±250[9] K |
| Rotational velocity (v sin i) | 212[10] km/s |
| Age | 644[9] Myr |
| Other designations | |
64 Eri, S Eri, BD−12° 1047, HD 32045, HIP 23231, HR 1611, SAO 150064[11] | |
| Database references | |
| SIMBAD | data |
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]
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