64 Eridani
Single, yellow-white hued star in the constellation Eridanus
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64 Eridani is a single,[13] 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 4.8.[6] The annual parallax shift is measured at 12.01 mas, which equates to a distance of about 283 light years.[2] In addition to its proper motion, it is moving closer to the Sun with a radial velocity of around −9 km/s.[8]
  | |
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 04h 59m 55.73680s[2] |
| Declination | −12° 32′ 14.7004″[2] |
| Apparent magnitude (V) | 4.77 – 4.79[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4] |
| Spectral type | F0 V[5] |
| B−V color index | 0.266[6] |
| Variable type | δ Sct[7][3] |
| Astrometry | |
| Radial velocity (Rv) | −8.9±4.2[8] km/s |
| Proper motion (μ) | RA: +39.894[2] mas/yr Dec.: −87.358[2] mas/yr |
| Parallax (π) | 11.5441±0.0851 mas[2] |
| Distance | 283 ± 2 ly (86.6 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.03[1] |
| Details | |
| Mass | 2.33[9] M☉ |
| Radius | 5.22[10] R☉ |
| Luminosity | 65[10] L☉ |
| Surface gravity (log g) | 3.37[9] cgs |
| Temperature | 7,346±250[9] K |
| Rotational velocity (v sin i) | 212[11] km/s |
| Age | 756[9] Myr |
| Other designations | |
| 64 Eri, S Eri, BD−12°1047, HD 32045, HIP 23231, HR 1611, SAO 150064[12] | |
| Database references | |
| SIMBAD | data |
This is an F-type star with a stellar classification of F0 V.[5] It is catalogued a low amplitude Delta Scuti variable with a primary period of 0.273 days.[7] It was originally classified, tentatively, as an RR Lyrae variable of type 'c'.[15]
64 Eridani is spinning rapidly with a projected rotational velocity of 212 km/s.[11] This is giving the star an oblate shape with an equatorial bulge; its equatorial radius is 8% larger than its polar radius.[16] The star is an estimated 756 million years old with 2.3 times the mass of the Sun.[9] It is radiating 65 times the Sun's luminosity[10] from its photosphere at an effective temperature of roughly 7,346 K.[9]