Psi Leonis

ψ Leonis (Latinised as Psi Leonis, abbreviated to ψ Leo or psi Leo), is a solitary[3] star located in the zodiac constellation of Leo, to the east-northeast of Regulus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38.[2] Based upon stellar parallax measurements,[1] it is located around 95 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an absorption factor of 0.3 due to interstellar dust.[5]

ψ Leonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Leo
Right ascension  09h 43m 43.90499s[1]
Declination +14° 01′ 18.1033″[1]
Apparent magnitude (V) 5.38[2]
Characteristics
Spectral type M2 IIIab[3]
U−B color index +1.95[2]
B−V color index +1.60[2]
Astrometry
Radial velocity (Rv)10.31±0.41[4] km/s
Proper motion (μ) RA: −344.28[1] mas/yr
Dec.: −47.65[1] mas/yr
Parallax (π)34.49 ± 0.20[1] mas
Distance94.6 ± 0.5 ly
(29.0 ± 0.2 pc)
Absolute magnitude (MV)−1.39[5]
Details
Luminosity903[6] L☉
Temperature3,756[6] K
Other designations
ψ Leo, 16 Leo, BD+14°2136, FK5 1252, HD 84194, HIP 47723, HR 3866, SAO 98733[7]
Database references
SIMBADdata

Psi Leonis is an evolved red giant star with a stellar classification of M2 IIIab.[3] It shines with a luminosity over 900 times that of the Sun from a relatively cool outer atmosphere that has an effective temperature of 3,756.[6] It is a suspected variable star with a measured brightness variation of 0m.018.[8] Psi Leonis has a magnitude 11.63 visual companion at an angular separation of 281.60 arcseconds along a position angle of 139°, as of 2000.[9]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
  3. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. Famaey, B.; et al. (May 2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698.
  5. Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
  6. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  7. "* psi Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-29.
  8. Percy, John R.; et al. (June 1994), "Photometric surveys of suspected small-amplitude red variables. III: An AAVSO photometric photometry survey", Publications of the Astronomical Society of the Pacific, 106 (700): 611–615, Bibcode:1994PASP..106..611P, doi:10.1086/133420.
  9. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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