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Location of β Arae |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Ara |
| Right ascension | 17h 25m 17.9887s |
| Declination | -55° 31′ 47.583″ |
| Apparent magnitude (V) | 2.832 |
| Characteristics | |
| Spectral type | K3Ib-II |
| U−B color index | 1.56 |
| B−V color index | 1.46 |
| R−I color index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | -0.4 km/s |
| Proper motion (μ) | RA: -8.23 mas/yr Dec.: -24.71 mas/yr |
| Parallax (π) | 5.41 ± 0.76 mas |
| Distance | approx. 600 ly (approx. 180 pc) |
| Absolute magnitude (MV) | -3.5 |
| Details | |
| Mass | 7.8 M☉ |
| Radius | 110 R☉ |
| Luminosity | 4500 L☉ |
| Temperature | 4240 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Beta Arae (β Ara, β Arae) is the brightest star in the constellation Ara.
Beta Arae is an orange K-type bright giant or supergiant with an apparent magnitude of +2.84. It is approximately 603 light years from Earth.
Rarely, this star is called by the name Vasat-ül-cemre in Turkish spelling, derived from Arabic word ﻭﺳﻂ (wasath) and ﺟﻤﻩﺮ (khamra), meaning "middle of fire".[1]
In Chinese, 杵 (Chǔ), meaning Pestle, refers to an asterism consisting of β Arae, σ Arae and α Arae.[2] Consequently, β Arae itself is known as 杵三 (Chǔ sān, English: the Third Star of Pestle.)[3]
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