Tau7 Eridani
Tau7 Eridani is a solitary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 5.235. Using the parallax method, the distance to this star can be estimated as around 251 light years.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03h 47m 39.65058s |
| Declination | −23° 52′ 28.8352″ |
| Apparent magnitude (V) | 5.235 |
| Characteristics | |
| Spectral type | A3 Vs |
| U−B color index | +0.168 |
| B−V color index | +0.067 |
| Astrometry | |
| Radial velocity (Rv) | 28.4±0.5 km/s |
| Proper motion (μ) | RA: +47.46 mas/yr Dec.: +49.10 mas/yr |
| Parallax (π) | 13.00 ± 0.28 mas |
| Distance | 251 ± 5 ly (77 ± 2 pc) |
| Absolute magnitude (MV) | +0.81 |
| Details | |
| τ7 Eri A | |
| Mass | 2.03 M☉ |
| Luminosity | 37.6 L☉ |
| Surface gravity (log g) | 3.86±0.2 cgs |
| Temperature | 8,740±200 K |
| Rotational velocity (v sin i) | 18 km/s |
| Age | 387 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an A-type main sequence star with a stellar classification of A3 Vs, where the 's' indicates it has narrow absorption lines. It may be a chemically peculiar Am star, which means it displays unusual abundances of certain elements in its surface layers. Tau7 Eridani appears to be a low amplitude variable that displays slight fluctuations in luminosity over a period of 7.17 days. It is slowly rotating with a projected rotational velocity of 18 km/s, and is around 387 million years old.
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