Star in the constellation Libra
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0
       Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
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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, so it can be seen with the naked eye. The annual parallax shift of 10.57 mas indicates it is roughly 310 light years away. It is positioned 0.02 degrees south of the ecliptic.
The star shows acceleration components in its proper motion, indicating with high probability that it is an astrometric binary. The visible component is an evolved K-type giant star with a stellar classification of K5 III. It is a suspected variable star with a brightness that ranges between 4.70 and 4.75. The measured angular diameter is , which, at the estimated distance of Kappa Librae, yields a physical size of about 38 times the radius of the Sun. It radiates 296 times the solar luminosity from its outer atmosphere at an effective temperature of 3,930 K.
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).
References.
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