Astronomy:Psi Leonis
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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 |
| Distance | 94.6 ± 0.5 ly (29.0 ± 0.2 pc) |
| Absolute magnitude (MV) | −1.39[5] |
| Details | |
| Luminosity | 903[6] L☉ |
| Temperature | 3,756[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1051/0004-6361/200810698, Bibcode: 2009A&A...498..627F.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
- ↑ 6.0 6.1 6.2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "* psi Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+psi+Leo.
- ↑ 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, doi:10.1086/133420, Bibcode: 1994PASP..106..611P.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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