Kappa Leonis

κ Leonis
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]
Distance201 ± 3 ly
(61.7 ± 0.8 pc)
Absolute magnitude (MV)0.66±0.028[5]
Details
Mass1.44[2] M☉
Radius17[6] R☉
Luminosity89[2] L☉
Surface gravity (log g)2.34[7] cgs
Temperature4,403±24[2] K
Metallicity [Fe/H]+0.01[7] dex
Rotational velocity (v sin i)10[8] km/s
Age4.33[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
SIMBADdata

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]

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]

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  2. ^ a b c d e f g h i j k Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aaa430 was invoked but never defined (see the help page).
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  6. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference apjss74 was invoked but never defined (see the help page).
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  9. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
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  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).