Location of 72 Leonis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11 15 12.22709 |
| Declination | +23° 05′ 43.8373″ |
| Apparent magnitude (V) | 4.63 |
| Characteristics | |
| Spectral type | M3 IIb |
| B−V color index | 1.657±0.003 |
| Variable type | LC |
| Astrometry | |
| Radial velocity (Rv) | 14.76±0.21 km/s |
| Proper motion (μ) | RA: −25.56 mas/yr Dec.: −6.00 mas/yr |
| Parallax (π) | 3.40 ± 0.65 mas |
| Distance | approx. 1,000 ly (approx. 290 pc) |
| Absolute magnitude (MV) | −2.69 |
| Details | |
| Mass | 3.11 M☉ |
| Radius | 195 R☉ |
| Luminosity | 5,770 L☉ |
| Surface gravity (log g) | 1.16 cgs |
| Temperature | 3,613±48 K |
| Metallicity | −0.03 dex |
| Age | 400 Myr |
| Other designations | |
| 72 Leo, FN Leo, BD+23°2322, FK5 2897, HD 97778, HIP 54951, HR 4362, SAO 81736 | |
| Database references | |
| SIMBAD | data |
72 Leonis is a single variable star in the zodiac constellation of Leo, located roughly 1,000 light years away from the Sun. It has the variable star designation FN Leonis; 72 Leonis is the Flamsteed designation. In Chinese astronomy, 72 Leonis is called 虎賁, Pinyin: Hǔbēn, meaning Emperor’s Bodyguard, because this star is marking itself and stands alone in the Emperor’s Bodyguard asterism, Supreme Palace enclosure mansion (see : Chinese constellation).
This object is visible to the naked eye as a red-hued star with an apparent visual magnitude of 4.56. It is an evolved bright giant with a stellar classification of M3 IIb and was listed as a spectral standard star for that class. The star is classified as an irregular variable of type LC, ranging from Hipparcos magnitude 4.56 down to 4.64. It has a radius 162 to 179 times that of the Sun and radiates 5,407 times the Sun's luminosity at an effective temperature of around 3,734 K. The star is moving away from the Earth with a heliocentric radial velocity of 15 km/s.
References
- ^ 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, S2CID 18759600.
- Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues, 2237, Bibcode:2002yCat.2237....0D.
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Van Belle, Gerard T. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1): 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
- McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471 (1): 770, arXiv:1706.02208, Bibcode:2017MNRAS.471..770M, doi:10.1093/mnras/stx1433, S2CID 73594365.
- "72 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-09.
- 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, S2CID 14878976.
- Leo the Lion, Ian Ridpath's Startales, retrieved 2019-02-10.
- Kaler, James B. (May 11, 2012), "72 Leonis", stars.astro.illinois.edu, retrieved 2017-10-09.
- McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- Dyck, H. M.; et al. (1998), "Radii and Effective Temperatures for K and M Giants and Supergiants. II", The Astronomical Journal, 116 (2): 981, Bibcode:1998AJ....116..981D, CiteSeerX 10.1.1.24.1889, doi:10.1086/300453, S2CID 16674990.
- "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
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