Kappa Leonis
Star in the constellation Leo
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Kappa Leonis, Latinized from κ Leonis, is a double star in the constellation Leo.[9] It was called Al-minħar al-asad (Arabic: المنخر الأسد), meaning "the Lion's nose."[10] The name is corrupted to Al Minliar al Asad in the Yale Bright Star Catalogue.[11] This star is visible to the naked eye with an apparent visual magnitude of 4.46.[2] It has an annual parallax shift of 16.20 mas as seen from Earth, which provides a distance estimate of about 201 light years. Kappa Leonis is moving away from the Sun with a radial velocity of +28 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 24m 39.25874s[1] |
| Declination | +26° 10′ 56.3650″[1] |
| Apparent magnitude (V) | 4.460[2] |
| Characteristics | |
| Spectral type | K2 III[2] |
| U−B color index | +1.31[3] |
| B−V color index | +1.23[3] |
| Astrometry | |
| Radial velocity (Rv) | +27.94[4] km/s |
| Proper motion (μ) | RA: –31.64[1] mas/yr Dec.: –48.20[1] mas/yr |
| Parallax (π) | 16.20±0.21 mas[1] |
| Distance | 201 ± 3 ly (61.7 ± 0.8 pc) |
| Absolute magnitude (MV) | 0.66±0.028[5] |
| Details | |
| Mass | 1.44[2] M☉ |
| Radius | 17[6] R☉ |
| Luminosity | 89[2] L☉ |
| Surface gravity (log g) | 2.34[7] cgs |
| Temperature | 4,403±24[2] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Rotational velocity (v sin i) | 10[8] km/s |
| Age | 4.33[2] Gyr |
| Other designations | |
| Al Min'ħar al A'sad, κ Leo, 1 Leo, BD+26°1939, FK5 1244, HD 81146, HIP 46146, HR 3731, SAO 80807[9] | |
| Database references | |
| SIMBAD | data |
The primary component is an evolved K-type giant star with a stellar classification of K2 III.[2] It is about the same age as the Sun with an estimated 144%[2] of the Sun's mass and has expanded to 17[6] times the Sun's girth. It is radiating 89[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,400 K.[2]
Kappa Leonis has a magnitude 10.4 companion at an angular separation of 2.1 arc seconds. The pair most likely form a binary star system.[12] The companion is a suspected variable star.[13]