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- Epsilon_Eridani abstract "Epsilon Eridani (ε Eri, ε Eridani), or Ran, is a star in the southern constellation Eridanus, along a declination 9.46° south of the celestial equator. This allows it to be viewed from most of Earth's surface. At a distance of 10.5 light years (ly), it has an apparent magnitude of 3.73. It is the third closest individual star or star system visible to the unaided eye and was the closest star known to host a planet until the unconfirmed discovery of Alpha Centauri Bb. Its age is estimated at less than a billion years. Because of its youth, Epsilon Eridani has a higher level of magnetic activity than the present-day Sun, with a stellar wind 30 times as strong. Its rotation period is 11.2 days at the equator. Epsilon Eridani is smaller and less massive than the Sun, and has a comparatively lower level of elements heavier than helium. It is a main-sequence star of spectral class K2, which means that energy generated at the core through nuclear fusion of hydrogen is emitted from the surface at a temperature of about 5,000 K, giving it an orange hue.The motion of Epsilon Eridani along the line of sight to Earth, known as the radial velocity, has been regularly observed for more than twenty years. Periodic changes in this data yielded evidence of a giant planet orbiting Epsilon Eridani, making it one of the nearest extrasolar systems with a candidate exoplanet. This object, Epsilon Eridani b, was formally announced in 2000 by a team of astronomers led by Artie Hatzes. Current data indicate that this planet orbits with a period of about 7 years at a mean separation of 3.4 astronomical units (AU), where 1 AU is the mean distance between Earth and the Sun. Although this discovery has been controversial because of the amount of background noise in the radial velocity data, many astronomers now regard the planet as confirmed.The system includes two belts of rocky asteroids: one at about 3 AU and a second at about 20 AU, whose structure may be maintained by a hypothetical second planet, Epsilon Eridani c. Epsilon Eridani harbors an extensive outer debris disk of remnant planetesimals left over from the system's formation.Epsilon Eridani's designation was established in 1603 by Johann Bayer. It may be a member of the Ursa Major Moving Group of stars that share a similar motion through the Milky Way, implying these stars shared a common origin in an open cluster. Its nearest neighbor, the binary star system Luyten 726-8, will have a close encounter with Epsilon Eridani in approximately 31,500 years when they will be separated by about 0.93 ly. As one of the nearest Sun-like stars with the potential for a planet that may harbor life, Epsilon Eridani has been the target of SETI searches. Epsilon Eridani appears in science fiction stories and has been suggested as a destination for interstellar travel. From Epsilon Eridani, the Sun would appear as a 2.4-magnitude star in Serpens.".
- Epsilon_Eridani thumbnail Eridanus_IAU.svg?width=300.
- Epsilon_Eridani wikiPageExternalLink epseri.shtml.
- Epsilon_Eridani wikiPageExternalLink 1998_epseri.
- Epsilon_Eridani wikiPageExternalLink atlas_skymap.cfm?Planet=109&Zoom=1.
- Epsilon_Eridani wikiPageExternalLink eps-erid.htm.
- Epsilon_Eridani wikiPageExternalLink ?id=arYYRoYjKacC&pg=PA174.
- Epsilon_Eridani wikiPageExternalLink books?id=IyjrCAAAQBAJ&pg=PA103.
- Epsilon_Eridani wikiPageID "167664".
- Epsilon_Eridani wikiPageLength "103456".
- Epsilon_Eridani wikiPageOutDegree "297".
- Epsilon_Eridani wikiPageRevisionID "707322099".
- Epsilon_Eridani wikiPageWikiLink 80th_parallel_north.
- Epsilon_Eridani wikiPageWikiLink Abd_al-Rahman_al-Sufi.
- Epsilon_Eridani wikiPageWikiLink Absorption_spectroscopy.
- Epsilon_Eridani wikiPageWikiLink Al-Biruni.
- Epsilon_Eridani wikiPageWikiLink Alexandria.
- Epsilon_Eridani wikiPageWikiLink Almagest.
- Epsilon_Eridani wikiPageWikiLink Alpha_Centauri.
- Epsilon_Eridani wikiPageWikiLink Alpha_Centauri_Bb.
- Epsilon_Eridani wikiPageWikiLink Alpha_Serpentis.
- Epsilon_Eridani wikiPageWikiLink Ancient_Greek_astronomy.
- Epsilon_Eridani wikiPageWikiLink Angular_diameter.
- Epsilon_Eridani wikiPageWikiLink Angular_velocity.
- Epsilon_Eridani wikiPageWikiLink Apparent_magnitude.
- Epsilon_Eridani wikiPageWikiLink Artie_P._Hatzes.
- Epsilon_Eridani wikiPageWikiLink Asteroid.
- Epsilon_Eridani wikiPageWikiLink Astrometry.
- Epsilon_Eridani wikiPageWikiLink Astronomical_unit.
- Epsilon_Eridani wikiPageWikiLink Astronomy_in_the_medieval_Islamic_world.
- Epsilon_Eridani wikiPageWikiLink Axial_tilt.
- Epsilon_Eridani wikiPageWikiLink BY_Draconis_variable.
- Epsilon_Eridani wikiPageWikiLink Bayer_designation.
- Epsilon_Eridani wikiPageWikiLink Book_of_Fixed_Stars.
- Epsilon_Eridani wikiPageWikiLink Bow_shocks_in_astrophysics.
- Epsilon_Eridani wikiPageWikiLink Bright_Star_Catalogue.
- Epsilon_Eridani wikiPageWikiLink British_Interplanetary_Society.
- Epsilon_Eridani wikiPageWikiLink Calcium.
- Epsilon_Eridani wikiPageWikiLink Carbon_monoxide.
- Epsilon_Eridani wikiPageWikiLink Category:Astronomical_objects_discovered_in_the_2nd_century.
- Epsilon_Eridani wikiPageWikiLink Category:Bayer_objects.
- Epsilon_Eridani wikiPageWikiLink Category:Circumstellar_disks.
- Epsilon_Eridani wikiPageWikiLink Category:Durchmusterung_objects.
- Epsilon_Eridani wikiPageWikiLink Category:Eridanus_(constellation).
- Epsilon_Eridani wikiPageWikiLink Category:Flamsteed_objects.
- Epsilon_Eridani wikiPageWikiLink Category:Gliese_and_GJ_objects.
- Epsilon_Eridani wikiPageWikiLink Category:HR_objects.
- Epsilon_Eridani wikiPageWikiLink Category:Henry_Draper_Catalogue_objects.
- Epsilon_Eridani wikiPageWikiLink Category:Hipparcos_objects.
- Epsilon_Eridani wikiPageWikiLink Category:K-type_main-sequence_stars.
- Epsilon_Eridani wikiPageWikiLink Category:Local_Bubble.
- Epsilon_Eridani wikiPageWikiLink Category:Planetary_systems.
- Epsilon_Eridani wikiPageWikiLink Category:Solar-type_stars.
- Epsilon_Eridani wikiPageWikiLink Category:Stars_with_proper_names.
- Epsilon_Eridani wikiPageWikiLink Celestial_equator.
- Epsilon_Eridani wikiPageWikiLink Celestial_sphere.
- Epsilon_Eridani wikiPageWikiLink Chromosphere.
- Epsilon_Eridani wikiPageWikiLink Circumstellar_habitable_zone.
- Epsilon_Eridani wikiPageWikiLink Convection_zone.
- Epsilon_Eridani wikiPageWikiLink Corona.
- Epsilon_Eridani wikiPageWikiLink Cosmic_dust.
- Epsilon_Eridani wikiPageWikiLink Debris_disk.
- Epsilon_Eridani wikiPageWikiLink Declination.
- Epsilon_Eridani wikiPageWikiLink Delta_Eridani.
- Epsilon_Eridani wikiPageWikiLink Differential_rotation.
- Epsilon_Eridani wikiPageWikiLink Diffusion.
- Epsilon_Eridani wikiPageWikiLink Doppler_effect.
- Epsilon_Eridani wikiPageWikiLink Durchmusterung.
- Epsilon_Eridani wikiPageWikiLink Egypt.
- Epsilon_Eridani wikiPageWikiLink Elliptic_orbit.
- Epsilon_Eridani wikiPageWikiLink Epoch_(astronomy).
- Epsilon_Eridani wikiPageWikiLink Epsilon_Eridani.
- Epsilon_Eridani wikiPageWikiLink Epsilon_Eridani_b.
- Epsilon_Eridani wikiPageWikiLink Epsilon_Eridani_in_fiction.
- Epsilon_Eridani wikiPageWikiLink Erg.
- Epsilon_Eridani wikiPageWikiLink Eridanus_(constellation).
- Epsilon_Eridani wikiPageWikiLink Exocomet.
- Epsilon_Eridani wikiPageWikiLink Exoplanet.
- Epsilon_Eridani wikiPageWikiLink Exozodiacal_dust.
- Epsilon_Eridani wikiPageWikiLink Extinction_(astronomy).
- Epsilon_Eridani wikiPageWikiLink Extraterrestrial_life.
- Epsilon_Eridani wikiPageWikiLink Flamsteed_designation.
- Epsilon_Eridani wikiPageWikiLink Fluid_dynamics.
- Epsilon_Eridani wikiPageWikiLink Francis_Baily.
- Epsilon_Eridani wikiPageWikiLink Frank_Drake.
- Epsilon_Eridani wikiPageWikiLink Friedrich_Bessel.
- Epsilon_Eridani wikiPageWikiLink Galactic_coordinate_system.
- Epsilon_Eridani wikiPageWikiLink Galactocentric_distance.
- Epsilon_Eridani wikiPageWikiLink Gamma_Eridani.
- Epsilon_Eridani wikiPageWikiLink Giant_planet.
- Epsilon_Eridani wikiPageWikiLink Giuseppe_Cocconi.
- Epsilon_Eridani wikiPageWikiLink Giuseppe_Piazzi.
- Epsilon_Eridani wikiPageWikiLink Gliese_Catalogue_of_Nearby_Stars.
- Epsilon_Eridani wikiPageWikiLink Greek_alphabet.
- Epsilon_Eridani wikiPageWikiLink Greek_language.
- Epsilon_Eridani wikiPageWikiLink Green_Bank_Interferometer.
- Epsilon_Eridani wikiPageWikiLink Heliometer.
- Epsilon_Eridani wikiPageWikiLink Heliosphere.
- Epsilon_Eridani wikiPageWikiLink Helium.
- Epsilon_Eridani wikiPageWikiLink Henry_Draper_Catalogue.