87 Leonis
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 30m 18.89335s |
| Declination | −03° 00′ 12.5712″ |
| Apparent magnitude (V) | 4.77 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K3+ III Fe−0.5 |
| U−B color index | +1.83 |
| B−V color index | +1.529±0.016 |
| R−I color index | +0.84 |
| Astrometry | |
| Radial velocity (Rv) | 18.40±0.15 km/s |
| Proper motion (μ) | RA: +19.554 mas/yr Dec.: −16.149 mas/yr |
| Parallax (π) | 6.5892±0.1128 mas |
| Distance | 495 ± 8 ly (152 ± 3 pc) |
| Absolute magnitude (MV) | −1.56 |
| Details | |
| Mass | 0.86 or 0.94 M☉ |
| Radius | 52.4±1.0 R☉ |
| Luminosity | 544±54 L☉ |
| Surface gravity (log g) | 0.95±0.06 cgs |
| Temperature | 3,852±90 K |
| Metallicity [Fe/H] | −0.39±0.05 dex |
| Rotational velocity (v sin i) | ≤ 19 km/s |
| Other designations | |
| e Leonis, 87 Leo, BD−02°3360, FK5 2917, GC 15779, HD 99998, HIP 56127, HR 4432, SAO 138238, PPM 178510 | |
| Database references | |
| SIMBAD | data |
87 Leonis is a single star in the zodiac constellation of Leo, located approximately 495 light years away from Earth. It has the Bayer designation e Leonis; 87 Leonis is the Flamsteed designation. This object is visible by the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.77. It is moving away from the Earth with a heliocentric radial velocity of 19 km/s. The star is positioned near the ecliptic and thus is subject to occultation by the Moon.
This is an aging K-type giant star with a stellar classification of K3+ III Fe−0.5, which means it has exhausted the hydrogen at its core and evolved away from the main sequence. The suffix notation indicates a mild underabundance of iron in the atmosphere. It has expanded to 52 times the Sun's radius and is radiating around 540 times the Sun's luminosity from its photosphere at an effective temperature of 3,852 K.
References
- 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 4 5 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.
- 1 2 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.
- 1 2 3 Hoffleit, Dorrit; Jaschek, Carlos (1991), "HR 4432", The Bright star catalogue (5th Revised ed.), New Haven, Conn.: Yale University Observatory, Bibcode:1991bsc..book.....H, retrieved 2010-11-08.
- 1 2 Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics. 682: A145. Bibcode:2024A&A...682A.145S. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. 87 Leonis' database entry in VizieR.
- 1 2 "87 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.
- ↑ Dunham, D. W.; Evans, D. S.; et al. (April 1974), "The angular diameter of 87 Leonis.", Astronomical Journal, 79: 483–484, Bibcode:1974AJ.....79..483D, doi:10.1086/111568
