Global InformationPsi Eridani information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 05h 01m 26.34599s[1] |
| Declination | −07° 10′ 26.2662″[1] |
| Apparent magnitude (V) | 4.81[2] |
| Characteristics | |
| Spectral type | B3 V[3] or B3 IV[4] |
| U−B color index | −0.75[2] |
| B−V color index | −0.19[2] |
| Astrometry | |
| Radial velocity (Rv) | 20.7±1.1[5] km/s |
| Proper motion (μ) | RA: +1.71[1] mas/yr Dec.: +6.29[1] mas/yr |
| Parallax (π) | 4.41 ± 0.23 mas[1] |
| Distance | 740 ± 40 ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.97[6] |
| Details | |
| Mass | 7.00±0.43[7] M☉ |
| Radius | 4.5[8] R☉ |
| Luminosity | 2,878[7] L☉ |
| Surface gravity (log g) | 3.859±0.025[9] cgs |
| Temperature | 18,700[7] K |
| Rotational velocity (v sin i) | 52±8[3] km/s |
| Age | 31.6±0.6[10] Myr |
| Other designations | |
ψ Eri, BD−07° 948, 65 Eridani, HD 32249, HIP 23364, HR 1617, SAO 131700[11] | |
| Database references | |
| SIMBAD | data |
Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81,[2] it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds,[1] it is located roughly 740 light-years away from the Sun.
This is a B-type main-sequence star with a stellar classification of B3 V.[3] However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32[10] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[7] and it has around 4.5 times the Sun's radius.[8] Psi Eridani shines with 2,878[7] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[7]
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