Xi Eridani
Star in the constellation Eridanus
From Wikipedia, the free encyclopedia
ξ Eridani (Latinised as Xi Eridani) is a solitary[6] star in the constellation Eridanus. With an apparent visual magnitude of 5.17,[2] it is faintly visible to the naked eye on a clear, dark night. Based upon an annual parallax shift of 0.00156 arcseconds,[1] it is located around 209 light years from the Sun. The star is considered a member of the Sirius supercluster.[5]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 23m 40.85270s[1] |
| Declination | −03° 44′ 43.6771″[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | A2 V[3] |
| U−B color index | +0.08[2] |
| B−V color index | +0.08[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.0[4] km/s |
| Proper motion (μ) | RA: −47.36[1] mas/yr Dec.: −54.91[1] mas/yr |
| Parallax (π) | 15.60±0.25 mas[1] |
| Distance | 209 ± 3 ly (64 ± 1 pc) |
| Absolute magnitude (MV) | +1.59[5] |
| Details | |
| Mass | 2.29[6] M☉ |
| Radius | 2.2[7] R☉ |
| Luminosity | 27.6[8] L☉ |
| Surface gravity (log g) | 3.73[9] cgs |
| Temperature | 8,400[8] K |
| Rotational velocity (v sin i) | 194.3±2.3[3] km/s |
| Age | 450[6] Myr |
| Other designations | |
| ξ Eri, BD−04°818, 42 Eridani, FK5 1120, HD 27861, HIP 20507, HR 1383, SAO 131176[10] | |
| Database references | |
| SIMBAD | data |
This is an ordinary A-type main sequence star with a stellar classification of A2 V,[3] indicating that it is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It is around 450[6] million years old and has a relatively high rate of rotation with a projected rotational velocity of 194 km/s.[3] The star has about 2.3 times the mass of the Sun,[6] 2.2 times the Sun's radius,[7] and radiates 27.6[8] times the solar luminosity from its outer atmosphere at an effective temperature of 8,400 K.[8]