17 Eridani
Star in the constellation Eridanus
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17 Eridani is a single[10] star in the equatorial constellation of Eridanus. It has the Bayer designation v Eridani, 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 | |
| v Eri, 17 Eri, BD−05°674, HD 21790, HIP 16341, HR 1070, SAO 130528[9] | |
| 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 the star is still generating energy through hydrogen fusion at its core, although nearing the end of its main sequence life.[3] 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]