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Star in the constellation Libra From Wikipedia, the free encyclopedia
Kappa Librae, Latinized from κ Librae, is the Bayer designation for a star system in the zodiac constellation of Libra. Its apparent visual magnitude is 4.72,[2] so it can be seen with the naked eye. The annual parallax shift of 10.57 mas[1] indicates it is roughly 310 light years away. It is positioned 0.02 degrees south of the ecliptic.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Libra |
Right ascension | 15h 41m 56.79858s[1] |
Declination | −19° 40′ 43.7745″[1] |
Apparent magnitude (V) | 4.72[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.94[2] |
B−V color index | +1.58[2] |
Astrometry | |
Radial velocity (Rv) | −4.5±1.5[4] km/s |
Proper motion (μ) | RA: −32.06[1] mas/yr Dec.: −103.15[1] mas/yr |
Parallax (π) | 10.57 ± 1.40 mas[1] |
Distance | approx. 310 ly (approx. 90 pc) |
Absolute magnitude (MV) | −0.62[5] |
Details | |
Radius | 38[6] R☉ |
Luminosity | 296[7] L☉ |
Temperature | 3,930[7] K |
Other designations | |
Database references | |
SIMBAD | data |
The star shows acceleration components in its proper motion, indicating with high probability that it is an astrometric binary.[9] The visible component is an evolved K-type giant star with a stellar classification of K5 III.[3] It is a suspected variable star with a brightness that ranges between 4.70 and 4.75.[10] The measured angular diameter is 3.71±0.10 mas,[11] which, at the estimated distance of Kappa Librae, yields a physical size of about 38 times the radius of the Sun.[6] It radiates 296 times the solar luminosity from its outer atmosphere at an effective temperature of 3,930 K.[7]
In Chinese astronomy, Kappa Librae is called 日, Pinyin: Rì, meaning Sun, because this star is marking itself and stand alone in Sun asterism, Room mansion (see : Chinese constellation).[12]
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