Astronomy:Eta Leporis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lepus |
| Right ascension | 05h 56m 24.29300s[1] |
| Declination | −14° 10′ 03.7189″[1] |
| Apparent magnitude (V) | 3.72[2] |
| Characteristics | |
| Spectral type | F2 V[3] |
| U−B color index | +0.01[2] |
| B−V color index | +0.33[2] |
| R−I color index | +0.16[4] |
| Astrometry | |
| Radial velocity (Rv) | −1.6±0.2[5] km/s |
| Proper motion (μ) | RA: −42.06[1] mas/yr Dec.: +139.26[1] mas/yr |
| Parallax (π) | 67.21 ± 0.25[1] mas |
| Distance | 48.5 ± 0.2 ly (14.88 ± 0.06 pc) |
| Absolute magnitude (MV) | +2.85[6] |
| Details | |
| Mass | 1.42[5] M☉ |
| Radius | 1.52[7] R☉ |
| Luminosity | 6.03[6] L☉ |
| Surface gravity (log g) | 4.13[5] cgs |
| Temperature | 6,899±80[5] K |
| Metallicity [Fe/H] | −0.19[5] dex |
| Rotational velocity (v sin i) | 26[8] km/s |
| Age | 1.80[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Leporis, Latinised from η Leporis, is a single,[10] yellow-white-hued star in the southern constellation of Lepus, the hare. It is visible to the naked eye with an apparent visual magnitude of approximately 3.72.[2] The annual parallax shift of 67.21 mas yields a distance estimate of 49 light-years. It is moving closer to the Sun with a radial velocity of −1.6 km/s.[5]
This is an ordinary F-type main-sequence star with a stellar classification of F2 V.[3] It is about 1.8[5] billion years old and spinning with a projected rotational velocity of 26 km/s.[8] The star has 1.4[5] times the mass of the Sun and 1.5[7] times the Sun's radius. It shines with six[6] times the Sun's luminosity, which is being radiated from its photosphere at an effective temperature of around 6,899 K.[5] Using the IRS instrument on the Spitzer Space Telescope, excess infrared emission has been observed from the star, which can be modeled by a dust disk extending from 1 to 16 astronomical units from Eta Leporis.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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. http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99): 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (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. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ Hoffleit, D.; Warren, Jr., W. H.. The Bright Star Catalogue (5th Revised (Preliminary Version) ed.).HR 2085, database entry, CDS ID V/50. Accessed on line February 3, 2011.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 Casagrande, L. et al. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. Bibcode: 2011A&A...530A.138C.
- ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 7.0 7.1 Rhee, Joseph H. et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal 660 (2): 1556–1571, doi:10.1086/509912, Bibcode: 2007ApJ...660.1556R
- ↑ 8.0 8.1 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ "eta Lep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=eta+Lep.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (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.
- ↑ Lawler, S. M. et al. (November 2009). "Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars". The Astrophysical Journal 705 (1): 89–111. doi:10.1088/0004-637X/705/1/89. Bibcode: 2009ApJ...705...89L. See Table 7.
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