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.

β Eridani
Location of β Eridani (circled)
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
Distance90.0 ± 0.9 ly
(27.6 ± 0.3 pc)
Absolute magnitude (MV)+0.59
Details
Mass2.0 M
Radius2.4 R
Luminosity25 L
Surface gravity (log g)3.58 cgs
Temperature8,360, 8,104 K
Metallicity [Fe/H]–0.4 dex
Rotational velocity (v sin i)196 km/s
Other designations
Cursa/Kursa, Dhalim, β Eri, Beta Eridani, Beta Eri, 67 Eridani, 67 Eri, BD−05 1162, CCDM J05079-0506A, FK5 188, GC 6274, GJ 9175, HD 33111, HIP 23875, HR 1666, IDS 05030-0513 A, PPM 187729, SAO 131794, WDS 05078-0505A.
Database references
SIMBADdata
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