Beta Canum Venaticorum
 The location of β Canum Venaticorum (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 12h 33m 44.54482s |
| Declination | +41° 21′ 26.9248″ |
| Apparent magnitude (V) | 4.26 |
| Characteristics | |
| Spectral type | G0 V |
| U−B color index | 0.04 |
| B−V color index | 0.58 |
| Astrometry | |
| Radial velocity (Rv) | +6.9 km/s |
| Proper motion (μ) |
RA: –704.75 mas/yr Dec.: +292.74 mas/yr |
| Parallax (π) | 118.49 ± 0.20mas |
| Distance | 27.53 ± 0.05 ly (8.44 ± 0.01 pc) |
| Absolute magnitude (MV) | 4.64 |
| Details | |
| Mass | 1.025 ± 0.050 M☉ |
| Radius | 1.123 ± 0.028 R☉ |
| Luminosity | 1.151 ± 0.018 L☉ |
| Surface gravity (log g) | 4.60 cgs |
| Temperature | 5,653 ± 72 K |
| Metallicity [Fe/H] | –0.21 dex |
| Rotational velocity (v sin i) | 2.9 ± 0.4 km/s |
| Age | 5.3 to 7.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Beta Canum Venaticorum (β Canum Venaticorum, abbreviated Beta CVn, β CVn), also named Chara, is a G-type main-sequence star in the northern constellation of Canes Venatici. At an apparent visual magnitude of 4.26, it is the second-brightest star in this relatively faint constellation. Based upon an annual parallax shift of 118.49 mas, this star is 27.53 light-years (8.44 parsecs) distant from the Sun.
Along with the brighter star Cor Caroli, the pair form the "southern dog" in this constellation that represents hunting dogs.
β Canum Venaticorum (Latinised to Beta Canum Venaticorum) is the star's Bayer designation.
The traditional name Chara was originally applied to the "southern dog", but it later became used specifically to refer to Beta Canum Venaticorum. Chara (χαρά) means 'joy' in Greek. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Chara for this star.
In Chinese, 常陳 (Cháng Chén), meaning Imperial Guards, refers to an asterism consisting of Beta Canum Venaticorum, Alpha Canum Venaticorum, 10 Canum Venaticorum, 6 Canum Venaticorum, 2 Canum Venaticorum, and 67 Ursae Majoris. Consequently, Beta Canum Venaticorum itself is known as 常陳四 (Cháng Chén sì, English: the Fourth Star of Imperial Guards.)
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