Beta Eridani
Beta Eridani (β Eridani, abbreviated Beta Eri, β Eri), formally named Cursa /ˈkɜːrsə/, is the second-brightest star in the constellation of Eridanus, located in the northeast end of this constellation near the shared border with Orion. The apparent visual magnitude of this star is 2.796, so it can be viewed with the naked eye in dark skies. Parallax measurements yield an estimated distance of about 89 light-years (27 parsecs) from the Earth.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 05h 07m 50.98549s |
| Declination | −05° 05′ 11.2055″ |
| Apparent magnitude (V) | 2.796 |
| Characteristics | |
| Spectral type | A3 III var |
| U−B color index | +0.124 |
| B−V color index | +0.110 |
| R−I color index | +0.08 |
| Astrometry | |
| Radial velocity (Rv) | –3.6 km/s |
| Proper motion (μ) | RA: -82.82 mas/yr Dec.: -75.39 mas/yr |
| Parallax (π) | 36.2456 ± 0.3575 mas |
| Distance | 90.0 ± 0.9 ly (27.6 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.59 |
| Details | |
| Mass | 2.0 M☉ |
| Radius | 2.4 R☉ |
| Luminosity | 25 L☉ |
| Surface gravity (log g) | 3.58 cgs |
| Temperature | 8,360, 8,104 K |
| Metallicity [Fe/H] | –0.4 dex |
| Rotational velocity (v sin i) | 196 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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