Epsilon Eridani

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Epsilon Eridani
Epsilon Eridani is locatit in 100x100
Epsilon Eridani
A starn chairt o the Eridanus constellation shawin the poseetion o ε Eridani (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Richt ascension 03h 32m 55.84496s[1]
Declination −09° 27′ 29.7312″[1]
Apparent magnitude (V) 3.736[2]
Chairacteristics
Spectral teep K2V[3]
Apparent magnitude (B) 4.61[4]
Apparent magnitude (V) 3.73[4]
Apparent magnitude (J) 2.228 ±0.298[5]
Apparent magnitude (H) 1.880 ± 0.276[5]
Apparent magnitude (K) 1.776 ± 0.286[5]
U−B colour index +0.571[2]
B−V colour index +0.887[2]
Variable teep BY Dra[4][6]
Astrometry
Radial velocity (Rv)+15.5 ± 0.9[7] km/s
Proper motion (μ) RA: −975.17[1] mas/yr
Dec.: 19.49[1] mas/yr
Parallax (π)311.37 ± 0.1[8] mas
Distance10.475 ± 0.003 ly
(3.212 ± 0.001 pc)
Absolute magnitude (MV)6.19[9]
Details
Mass0.82 ± 0.02[10][11] M
Radius0.735 ± 0.005[12] R
Luminosity0.34[13] L
Surface gravity (log g)4.30 ± 0.08[10] cgs
Temperatur5,084 ± 5.9[14] K
Metallicity [Fe/H]−0.13 ± 0.04[15] dex
Rotation11.2 days[16]
Rotational velocity (v sin i)2.4 ± 0.5[16] km/s
Age360–720[17] Myr
Ither designations
Ran, 18 Eridani, BD -09°697, GCTP 742.00, GJ 144, HD 22049, HIP 16537, HR 1084, LHS 1557, SAO 130564, WDS 03330-0928.[4]
Database references
SIMBADThe star
planet b
planet c

Epsilon Eridani (ε Eridani, abbreviatit Epsilon Eri, ε Eri), an aa named Ran,[18] is a starn in the soothren constellation o Eridanus, at a declination o 9.46° sooth o the celestial equator.

References[eedit | eedit soorce]

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.  Note: see VizieR catalogue I/311.
  2. 2.0 2.1 2.2 Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C. 
  3. Gray, R. O.; et al. (July 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/0603770Freely accessible, Bibcode:2006AJ....132..161G, doi:10.1086/504637. 
  4. 4.0 4.1 4.2 4.3 "V* eps Eri – variable of BY Dra type", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved November 5, 2010. 
  5. 5.0 5.1 5.2 Cutri, R. M.; et al. (June 2003), "The IRSA 2MASS all-sky point source catalog, NASA/IPAC infrared science archive", The IRSA 2MASS All-Sky Point Source Catalog, Bibcode:2003tmc..book.....C. 
  6. "GCVS query=eps Eri", General Catalog of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia, retrieved May 20, 2009. 
  7. Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The revision of the general catalogue of radial velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, 30, p. 57, Bibcode:1967IAUS...30...57E. 
  8. Benedict, G. Fritz; et al. (November 2006), "The extrasolar planet e Eridani b – orbit and mass", The Astronomical Journal, 132 (5): 2206–2218, arXiv:astro-ph/0610247Freely accessible, Bibcode:2006AJ....132.2206B, doi:10.1086/508323. 
  9. Staff (June 8, 2007), The one hundred nearest star systems, Research Consortium on Nearby Stars, retrieved November 29, 2007 
  10. 10.0 10.1 Gonzalez, G.; Carlson, M. K.; Tobin, R. W. (April 2010), "Parent stars of extrasolar planets – X. Lithium abundances and v sini revisited", Monthly Notices of the Royal Astronomical Society, 403 (3): 1368–1380, arXiv:0912.1621Freely accessible, Bibcode:2010MNRAS.403.1368G, doi:10.1111/j.1365-2966.2009.16195.x.  See table 3.
  11. Baines, Ellyn K.; Armstrong, J. Thomas (2011), "Confirming Fundamental Parameters of the Exoplanet Host Star epsilon Eridani Using the Navy Optical Interferometer", The Astrophysical Journal, 748: 72, arXiv:1112.0447Freely accessible, Bibcode:2012ApJ...748...72B, doi:10.1088/0004-637X/748/1/72. 
  12. Demory, B.-O.; et al. (October 2009), "Mass-radius relation of low and very low-mass stars revisited with the VLTI", Astronomy and Astrophysics, 505 (1): 205–215, arXiv:0906.0602Freely accessible, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976.  See Table B.1
  13. Saumon, D.; et al. (April 1996), "A theory of extrasolar giant planets", The Astrophysical Journal, 460: 993, arXiv:astro-ph/9510046Freely accessible, Bibcode:1996ApJ...460..993S, doi:10.1086/177027.  See Table A1, p. 21.
  14. Kovtyukh, V. V.; et al. (December 2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics, 411 (3): 559–564, arXiv:astro-ph/0308429Freely accessible, Bibcode:2003A&A...411..559K, doi:10.1051/0004-6361:20031378. 
  15. Santos, N. C.; Israelian, G.; Mayor, M. (March 2004), "Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation", Astronomy and Astrophysics, 415 (3): 1153–1166, arXiv:astro-ph/0311541Freely accessible, Bibcode:2004A&A...415.1153S, doi:10.1051/0004-6361:20034469. —the percentage of iron is given by , or 74%
  16. 16.0 16.1 Fröhlich, H.-E. (December 2007), "The differential rotation of Epsilon Eri from MOST data", Astronomische Nachrichten, 328 (10): 1037–1039, arXiv:0711.0806Freely accessible, Bibcode:2007AN....328.1037F, doi:10.1002/asna.200710876. 
  17. Janson, Markus; et al. (February 2015), "High-contrast imaging with Spitzer: deep observations of Vega, Fomalhaut, and ε Eridani", Astronomy & Astrophysics, 574: 10, arXiv:1412.4816Freely accessible, Bibcode:2015A&A...574A.120J, doi:10.1051/0004-6361/201424944, A120. 
  18. "IAU Catalog of Star Names". Retrieved July 28, 2016. 

Coordinates: Sky map 03h 32m 55.8442s, −09° 27′ 29.744″