17 Eridani is a single[10] star in the equatorial constellation of Eridanus. It has the Bayer designation v Eridani (not to be confused with ν Eri), while 17 Eridani is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.74.[2] It is moving further from the Earth with a heliocentric radial velocity of around +15 km/s.[2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 30m 37.05823s[1] |
Declination | −05° 04′ 30.5239″[1] |
Apparent magnitude (V) | 4.74[2] |
Characteristics | |
Evolutionary stage | main sequence[3] |
Spectral type | B9 III[4] or B9Vs[5] |
B−V color index | −0.092±0.008[2] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.2[2] km/s |
Proper motion (μ) | RA: 14.23[1] mas/yr Dec.: 7.27[1] mas/yr |
Parallax (π) | 8.07 ± 0.20 mas[1] |
Distance | 400 ± 10 ly (124 ± 3 pc) |
Absolute magnitude (MV) | −0.72[2] |
Details | |
Mass | 3.55±0.04[3] M☉ |
Radius | 3.2[6] R☉ |
Luminosity | 267.9+15.2 −14.4[3] L☉ |
Surface gravity (log g) | 3.603±0.017[7] cgs |
Temperature | 11,143±51[3] K |
Rotational velocity (v sin i) | 86[3] km/s |
Age | 178+10 −9[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Houk and Swift (1999) found a stellar classification of B9 III[4] for this star, while Cowley et al. (1969) show B9 Vs.[5] Stellar models suggest this is a main-sequence star,[3] which indicates it is generating energy through hydrogen fusion at its core. It is about 178[8] million years old with 3.55[3] times the mass of the Sun and around 3.2[6] times the size of the Sun. The star is radiating 268[3] times the Sun's luminosity from its photosphere at an effective temperature of 11,143 K.[3] These coordinates are a source for X-ray emission, which may be coming from an unresolved companion.[7]