Upsilon1 Eridani
Upsilon1 Eridani (υ1 Eri) is a single star in the constellation Eridanus. It has an apparent visual magnitude is 4.51, which is bright enough to be faintly visible to the naked eye on a clear, dark night. The distance to this star, as determined using the parallax method, is around 127 light years.
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 33m 30.55236s |
| Declination | −29° 45′ 59.3725″ |
| Apparent magnitude (V) | 4.51 |
| Characteristics | |
| Spectral type | K0 III-IV |
| U−B color index | +0.70 |
| B−V color index | +0.98 |
| Astrometry | |
| Radial velocity (Rv) | +20.89±0.69 km/s |
| Proper motion (μ) | RA: −114.78 mas/yr Dec.: −271.79 mas/yr |
| Parallax (π) | 25.67 ± 0.24 mas |
| Distance | 127 ± 1 ly (39.0 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.60 |
| Details | |
| Mass | 1.54 M☉ |
| Radius | 7.3 R☉ |
| Luminosity | 24 L☉ |
| Surface gravity (log g) | 3.09 cgs |
| Temperature | 4,941 K |
| Metallicity [Fe/H] | −0.16±0.08 dex |
| Rotational velocity (v sin i) | 2.15 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved red clump giant star with a stellar classification of K0III-IV. The measured angular diameter, after correction for limb darkening, is 1.74±0.02 mas. At an estimated distance of this star, this yields a physical size of about 7.3 times the radius of the Sun. It has 154% of the Sun's mass and radiates 24 times the solar luminosity from its outer atmosphere at an effective temperature of 4,941 K.
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