Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 17h 25m 17.989s[1] |
Declination | −55° 31′ 47.574″[1] |
Apparent magnitude (V) | 2.84[2] |
Characteristics | |
Evolutionary stage | Red supergiant |
Spectral type | K0/1Ib[3] |
U−B color index | +1.56[4] |
B−V color index | +1.46[4] |
Astrometry | |
Radial velocity (Rv) | −0.30±0.20[5] km/s |
Proper motion (μ) | RA: −8.51[6] mas/yr Dec.: −25.24[6] mas/yr |
Parallax (π) | 4.5601 ± 0.2077 mas[1] |
Distance | 713+39 −34 ly (218.8+12 −10.4 pc)[7] |
Absolute magnitude (MV) | −3.494[8] |
Details[9] | |
Mass | 5.89±0.07 or 7.89±0.4 M☉ |
Radius | 141.4±6.6 R☉ |
Luminosity | 5,774±535 L☉ |
Surface gravity (log g) | 0.97±0.06 cgs |
Temperature | 4,232±17 K |
Metallicity [Fe/H] | 0.5±0.1 dex |
Rotational velocity (v sin i) | 5.4±1.0[5] km/s |
Age | 50.1±4.4[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Beta Arae (β Ara, β Arae), is the brightest star in the constellation of Ara. It is a very luminous, relatively young supergiant star with an apparent magnitude of 2.84 and an absolute magnitude of -3.494.[2][8] It is located about 713 light-years from Earth.[7] At this distance, its apparent magnitude is diminished by 0.193 magnitudes due to interstellar extinction between Earth and the star.[9]
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