17 Eridani
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 30m 37.05823s |
| Declination | −05° 04′ 30.5239″ |
| Apparent magnitude (V) | 4.74 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9 III or B9Vs |
| B−V color index | −0.092±0.008 |
| Astrometry | |
| Radial velocity (Rv) | +15.0±4.2 km/s |
| Proper motion (μ) | RA: 14.23 mas/yr Dec.: 7.27 mas/yr |
| Parallax (π) | 8.07±0.20 mas |
| Distance | 400 ± 10 ly (124 ± 3 pc) |
| Absolute magnitude (MV) | −0.72 |
| Details | |
| Mass | 3.55±0.04 M☉ |
| Radius | 3.2 R☉ |
| Luminosity | 267.9+15.2 −14.4 L☉ |
| Surface gravity (log g) | 3.603±0.017 cgs |
| Temperature | 11,143±51 K |
| Rotational velocity (v sin i) | 86 km/s |
| Age | 178+10 −9 Myr |
| Other designations | |
| v Eri, 17 Eri, BD−05°674, HD 21790, HIP 16341, HR 1070, SAO 130528 | |
| Database references | |
| SIMBAD | data |
17 Eridani is a single 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. It is moving further from the Earth with a heliocentric radial velocity of around +15 km/s.
Houk and Swift (1999) found a stellar classification of B9 III for this star, while Cowley et al. (1969) show B9 Vs. Stellar models suggest the star is still generating energy through hydrogen fusion at its core, although nearing the end of its main sequence life. It is about 178 million years old with 3.55 times the mass of the Sun and around 3.2 times the size of the Sun. The star is radiating 268 times the Sun's luminosity from its photosphere at an effective temperature of 11,143 K. These coordinates are a source for X-ray emission, which may be coming from an unresolved companion.