Star in the constellation of Lepus
η Leporis Location of η Leporis (circled in red)
Observation dataEpoch J2000.0 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−Bcolor index +0.01[ 2] B−Vcolor index +0.33[ 2] R−Icolor index +0.16[ 4] Astrometry Radial velocity (Rv )± 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 mas [ 1] Distance 48.5 ± 0.2 ly 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 ± 80[ 5] K Metallicity [Fe/H] −0.19[ 5] dex Rotational velocity (v sin i )26[ 8] Age 1.80[ 5] Gyr Other designations η Lep ,16 Leporis ,BD −14°1286FK5 226GC 7492GJ 225HD 40136HIP 28103HR 2085SAO 150957PPM 216474[ 9] Database references SIMBAD data
Eta Leporis ,Latinised from η Leporis, is a single,[ 10] star in thesouthern constellation ofLepus , the hare. It is visible to the naked eye with anapparent visual magnitude of approximately 3.72.[ 2] parallax shift of 67.21 mas yields a distance estimate of 49 light-years . It is moving closer to theSun with aradial velocity of −1.6 km/s.[ 5]
This is an ordinaryF-type main-sequence star with astellar classification of F2 V.[ 3] [ 5] projected rotational velocity of 26 km/s.[ 8] [ 5] mass of the Sun and 1.5[ 7] Sun's radius . It shines with six[ 6] Sun's luminosity , which is being radiated from itsphotosphere at aneffective temperature of aroundK [ 5] Spitzer Space Telescope ,excess infrared emission has been observed from the star, which can be modeled by adust disk extending from 1 to 16astronomical units from Eta Leporis.[ 11]
^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 .S2CID 18759600 . Vizier catalog entry ^a b c d 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 . ^a b 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.arXiv :astro-ph/0603770 Bibcode :2006AJ....132..161G .doi :10.1086/504637 .S2CID 119476992 . ^ Hoffleit, D.; Warren, Jr., W. H.The Bright Star Catalogue (5th Revised (Preliminary Version) ed.). HR 2085 , database entry,CDS IDV/50 . Accessed on line February 3, 2011.^a b c d e f g h i j 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.arXiv :1103.4651 Bibcode :2011A&A...530A.138C .doi :10.1051/0004-6361/201016276 .S2CID 56118016 . ^a b c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation".Astronomy Letters .38 (5):331– 346.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 .S2CID 119257644 . Vizier catalog entry ^a b Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs",The Astrophysical Journal ,660 (2):1556– 1571,arXiv :astro-ph/0609555 Bibcode :2007ApJ...660.1556R ,doi :10.1086/509912 ,S2CID 11879505 ^a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities".Astronomy & Astrophysics .537 : A120.arXiv :1201.2052 Bibcode :2012A&A...537A.120Z .doi :10.1051/0004-6361/201117691 .S2CID 55586789 . ^ "eta Lep" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2017-12-27 .^ 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.arXiv :0806.2878 Bibcode :2008MNRAS.389..869E .doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ 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.arXiv :0909.0058 Bibcode :2009ApJ...705...89L .doi :10.1088/0004-637X/705/1/89 .S2CID 1272803 .
