Mu Leonis

Mu Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension 09h 52m 45.81654s[1]
Declination +26° 00′ 25.0319″[1]
Apparent magnitude (V) 3.88[2]
Characteristics
Evolutionary stage Red giant branch[3]
Spectral type K2 IIIb CN1 Ca1[4]
U−B color index +1.38[2]
B−V color index +1.23[2]
Astrometry
Radial velocity (Rv)14.03±0.19[5] km/s
Proper motion (μ) RA: −217.31[1] mas/yr
Dec.: −54.26[1] mas/yr
Parallax (π)26.28 ± 0.16 mas[1]
Distance124.1 ± 0.8 ly
(38.1 ± 0.2 pc)
Absolute magnitude (MV)+0.83[6]
Details
Mass1.5±0.1[7] M☉
Radius11.89±0.11[8] R☉
Luminosity53±1[8] L☉
Surface gravity (log g)2.43±0.06[8] cgs
Temperature4,519±23[8] K
Metallicity [Fe/H]0.27±0.03[8] dex
Rotational velocity (v sin i)4.5[5] km/s
Age3.35±0.70,[7] ~5.0[3] Gyr
Other designations
Rasalas, Alshemali, μ Leo, 24 Leonis, BD+26°2019, HD 85503, HIP 48455, HR 3905, SAO 81064[9]
Database references
SIMBADdata

Mu Leonis (μ Leonis, abbreviated Mu Leo, μ Leo), also named Rasalas /ˈræsəlæs/,[10][11] is a star in the constellation of Leo. The apparent visual magnitude of this star is 3.88,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 0.02628 arc seconds as measured by the Hipparcos satellite,[1] this system is 124 light-years (38.1 parsecs) from the Sun. In 2014, an exoplanet was discovered to be orbiting the star.

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference :0 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cardini2005 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Lee2014 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference soubiran was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Rumrill, H. B. (June 1936). "Star Name Pronunciation". Publications of the Astronomical Society of the Pacific. 48 (283). San Francisco, California: 139. Bibcode:1936PASP...48..139R. doi:10.1086/124681. S2CID 120743052.
  11. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.