Eta Leporis

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η Leporis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 05h 56m 24.2929s[1]
Declination −14° 10′ 03.721″[1]
Apparent magnitude (V) 3.719[1]
Characteristics
Spectral type F2V[1]
U−B color index +0.01[2]
B−V color index +0.33[2]
R−I color index +0.16[2]
Astrometry
Radial velocity (Rv) −2.4 ± 0.9[1] km/s
Proper motion (μ) RA: −42.23[1] mas/yr
Dec.: 139.02[1] mas/yr
Parallax (π) 66.47 ± 0.74[1] mas
Distance 49.1 ± 0.5 ly
(15.0 ± 0.2 pc)
Absolute magnitude (MV) 2.83[3]
Details
Mass 1.42 (1.38 to 1.47)[4] M
Radius 1.5[5] R
Temperature 6900[4] K
Metallicity [Fe/H] = −0.25[4]
Rotational velocity (v sin i) 17[4] km/s
Age 1.8 (1.5 to 1.9) × 109[4] years
Other designations
η Lep, Eta Leporis, Eta Lep, 16 Leporis, 16 Lep, BD−14 1286, FK5 226, GC 7492, GJ 225, HD 40136, HIP 28103, HR 2085, PPM 216474, SAO 150957.[1]
Database references
SIMBAD data

Eta Leporis (Eta Lep, η Leporis, η Lep) is a F-type main sequence star in the constellation of Lepus.[1] It has an apparent visual magnitude of approximately 3.719.[1] Using the IRS instrument on the Spitzer Space Telescope, excess infrared emission has been observed from the star, which can be modelled by a dust disk extending from 1 to 16 astronomical units from the star.[6]

References[edit]

  1. ^ a b c d e f g h i j k * eta Lep -- Star, database entry, SIMBAD. Accessed on line February 3, 2011.
  2. ^ a b c HR 2085, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 3, 2011.
  3. ^ From apparent magnitude and parallax.
  4. ^ a b c d e HD 40136, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 3, 2011.
  5. ^ HD 40136, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 3, 2011.
  6. ^ Table 7, Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars, S. M. Lawler et al., The Astrophysical Journal 705, #1 (November 2009), pp. 89-111, doi:10.1088/0004-637X/705/1/89, Bibcode2009ApJ...705...89L.