Eta Leporis

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η Leporis
Observation data
Epoch 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−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
Distance48.5 ± 0.2 ly
(14.88 ± 0.06 pc)
Absolute magnitude (MV)+2.85[6]
Details
Mass1.42[5] M
Radius1.52[7] R
Luminosity6.03[6] L
Surface gravity (log g)4.13[5] cgs
Temperature6,899±80[5] K
Metallicity [Fe/H]−0.19[5] dex
Rotational velocity (v sin i)26[8] km/s
Age1.80[5] Gyr
Other designations
η Lep, 16 Leporis, BD−14° 1286, FK5 226, GC 7492, GJ 225, HD 40136, HIP 28103, HR 2085, SAO 150957, PPM 216474[9]
Database references
SIMBADdata

Eta Leporis, Latinized 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[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ 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). Bibcode:1966CoLPL...4...99J. 
  3. ^ 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: 161. arXiv:astro-ph/0603770Freely accessible. Bibcode:2006AJ....132..161G. doi:10.1086/504637. 
  4. ^ 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. ^ 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:1103.4651Freely accessible. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. 
  6. ^ a b c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  7. ^ 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/0609555Freely accessible, Bibcode:2007ApJ...660.1556R, doi:10.1086/509912 
  8. ^ a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052Freely accessible. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. 
  9. ^ "eta Lep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-12-27. 
  10. ^ 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:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ 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:0909.0058Freely accessible. Bibcode:2009ApJ...705...89L. doi:10.1088/0004-637X/705/1/89.  See Table 7.