| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 11 34 21.94862 |
| Declination | +03° 03′ 36.5931″ |
| Apparent magnitude (V) | 5.70 |
| Characteristics | |
| Spectral type | F5.5V |
| B−V color index | 0.480±0.005 |
| Astrometry | |
| Radial velocity (Rv) | +4.775±0.0006 km/s |
| Proper motion (μ) | RA: −183.582 mas/yr Dec.: −102.903 mas/yr |
| Parallax (π) | 36.9527 ± 0.0817 mas |
| Distance | 88.3 ± 0.2 ly (27.06 ± 0.06 pc) |
| Absolute magnitude (MV) | 3.53 |
| Details | |
| Mass | 1.29 M☉ |
| Radius | 1.38±0.04 R☉ |
| Luminosity | 2.990+0.009 −0.010 L☉ |
| Surface gravity (log g) | 4.22 cgs |
| Temperature | 6,461+93 −90 K |
| Metallicity | −0.04 dex |
| Rotational velocity (v sin i) | 15.1 km/s |
| Age | 1.13 Gyr |
| Other designations | |
| 89 Leonis, BD+03°2521, FK5 2924, GJ 9367, HD 100563, HIP 56445, HR 4455, SAO 118929 | |
| Database references | |
| SIMBAD | data |
89 Leonis is a single star in the equatorial constellation of Leo, the lion. It has a yellow-white hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.70. Based upon parallax measurements, it is located at a distance of 88 light years from the Sun. The star has a high proper motion and is moving further away with a radial velocity of +4.8 km/s. It is a candidate member of the TW Hydrae stellar kinematic group.
This is an F-type main-sequence star with a stellar classification of F5.5V. It is an estimated 1.13 billion years old and is spinning with a rotation period of 7.73 days. It shows evidence of a short-term activity cycle lasting 222.5±3.3 days. The star has 1.3 times the mass of the Sun and 1.4 times the Sun's radius. It is radiating three times the luminosity of the Sun from its photosphere at an effective temperature of 6,461 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
- ^ Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- 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.
- ^ Soubiran, C.; et al. (2018), "Gaia Data Release 2. The catalogue of radial velocity standard stars", Astronomy and Astrophysics, 616: A7, arXiv:1804.09370, Bibcode:2018A&A...616A...7S, doi:10.1051/0004-6361/201832795, S2CID 52952408.
- "89 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-05.
- 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.
- ^ Nakajima, Tadashi; Morino, Jun-Ichi (2012), "Potential Members of Stellar Kinematic Groups within 30 pc of the Sun", The Astronomical Journal, 143 (1): 2, Bibcode:2012AJ....143....2N, doi:10.1088/0004-6256/143/1/2.
- ^ Mittag, M.; et al. (January 2019), "Discovery of short-term activity cycles in F-type stars", Astronomy & Astrophysics, 621: 7, Bibcode:2019A&A...621A.136M, doi:10.1051/0004-6361/201834319, A136.
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