Beta Eridani
Star in the constellation of Eridanus / From Wikipedia, the free encyclopedia
Beta Eridani (β Eridani, abbreviated Beta Eri, β Eri), formally named Cursa /ˈkɜːrsə/,[14] 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,[2] 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.[1]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 05h 07m 50.98549s[1] |
Declination | −05° 05′ 11.2055″[1] |
Apparent magnitude (V) | 2.796[2] |
Characteristics | |
Spectral type | A3 III var[3] |
U−B color index | +0.124[2] |
B−V color index | +0.110[2] |
R−I color index | +0.08[4] |
Astrometry | |
Radial velocity (Rv) | –3.6[5] km/s |
Proper motion (μ) | RA: -82.82[1] mas/yr Dec.: -75.39[1] mas/yr |
Parallax (π) | 36.2456 ± 0.3575 mas[6] |
Distance | 90.0 ± 0.9 ly (27.6 ± 0.3 pc) |
Absolute magnitude (MV) | +0.59[7] |
Details | |
Mass | 2.0[8] M☉ |
Radius | 2.4[8] R☉ |
Luminosity | 25[8] L☉ |
Surface gravity (log g) | 3.58[5] cgs |
Temperature | 8,360,[9] 8,104[5] K |
Metallicity [Fe/H] | –0.4[10] dex |
Rotational velocity (v sin i) | 196[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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