Pi Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 00m 12.80589s[1] |
| Declination | +08° 02′ 39.2032″[1] |
| Apparent magnitude (V) | 4.70[2] |
| Characteristics | |
| Spectral type | M2 III[3] |
| U−B color index | +1.88[2] |
| B−V color index | +1.60[2] |
| Astrometry | |
| Radial velocity (Rv) | 22.36±0.29[4] km/s |
| Proper motion (μ) | RA: −31.41[1] mas/yr Dec.: −22.15[1] mas/yr |
| Parallax (π) | 8.03 ± 0.29 mas[1] |
| Distance | 410 ± 10 ly (125 ± 4 pc) |
| Details | |
| Radius | 56[5] R☉ |
| Luminosity | 656[6] L☉ |
| Temperature | 3,829[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Pi Leonis (π Leo) is a star in the zodiac constellation Leo. It is visible to the naked eye with an apparent visual magnitude of 4.70,[2] and is located some 410 light years from the Sun. Because the star lies near the ecliptic it is subject to occultations by the Moon.[8]
This is an evolved, red giant star with a stellar classification of M2 III.[3] It has 56 times the Sun's radius, and shines with 656 times the luminosity of the Sun from an expanded outer atmosphere that has an effective temperature of 3,829 K.[6] According to the General Catalogue of Variable Stars, it is a suspected variable star with a maximum magnitude of 4.67.[9]
References
- ^ a b c d e 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.
- ^ a b c d Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
- ^ Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, H. A. (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.
{{citation}}: Unknown parameter|displayauthors=ignored (|display-authors=suggested) (help) - ^ Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- ^ a b c 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.
- ^ "pi. Leo -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-29.
- ^ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal, 94: 751, Bibcode:1987AJ.....94..751W, doi:10.1086/114513.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2007), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-09-30. VizieR On-line Data Catalog: B/gcvs.
{{citation}}: External link in|postscript=
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