From Wikipedia, the free encyclopedia
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  mas [1]
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
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. ^ 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
  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): 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 (1): 161–170. arXiv: astro-ph/0603770. Bibcode: 2006AJ....132..161G. doi: 10.1086/504637. S2CID  119476992.
  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: 1103.4651. Bibcode: 2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276. S2CID  56118016.
  6. ^ 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
  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/0609555, Bibcode: 2007ApJ...660.1556R, doi: 10.1086/509912, S2CID  11879505
  8. ^ a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID  55586789.
  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: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID  14878976.
  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: 0909.0058. Bibcode: 2009ApJ...705...89L. doi: 10.1088/0004-637X/705/1/89. S2CID  1272803. See Table 7.
From Wikipedia, the free encyclopedia
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  mas [1]
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
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. ^ 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
  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): 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 (1): 161–170. arXiv: astro-ph/0603770. Bibcode: 2006AJ....132..161G. doi: 10.1086/504637. S2CID  119476992.
  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: 1103.4651. Bibcode: 2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276. S2CID  56118016.
  6. ^ 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
  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/0609555, Bibcode: 2007ApJ...660.1556R, doi: 10.1086/509912, S2CID  11879505
  8. ^ a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052. Bibcode: 2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691. S2CID  55586789.
  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: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID  14878976.
  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: 0909.0058. Bibcode: 2009ApJ...705...89L. doi: 10.1088/0004-637X/705/1/89. S2CID  1272803. See Table 7.

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