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- Epsilon_Eridani abstract "Epsilon Eridani (ε Eri, ε Eridani) 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 system 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 the 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.".
- 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 wikiPageID "167664".
- Epsilon_Eridani wikiPageRevisionID "606133356".
- Epsilon_Eridani absmagV "6.19".
- Epsilon_Eridani ageGyr "0.2".
- Epsilon_Eridani align "right".
- Epsilon_Eridani alt "An uneven, multi-colored ring arranged around a five-sided star at the middle, with the strongest concentration below center. A smaller oval showing the scale of Pluto's orbit is in the lower right".
- Epsilon_Eridani alt "The upper two illustrations show brown oval bands for the asteroid belts and oval lines for the known planet orbits, with the glowing star at the center. The second brown band is narrower than the first. The lower two illustrations have gray bands for the comet belts, oval lines for the planetary orbits and the glowing stars at the center. The lower gray band is much wider than the upper gray band.".
- Epsilon_Eridani apoapsis "100".
- Epsilon_Eridani appmag "~3.73".
- Epsilon_Eridani appmag "~4.61".
- Epsilon_Eridani appmag1Passband "B".
- Epsilon_Eridani appmag2Passband "V".
- Epsilon_Eridani appmag3Passband "J".
- Epsilon_Eridani appmag4Passband "H".
- Epsilon_Eridani appmag5Passband "K".
- Epsilon_Eridani appmagV "3.736".
- Epsilon_Eridani bV "+0.887".
- Epsilon_Eridani caption "Comparison of the planets and debris belts in the Solar System to the Epsilon Eridani system. At the top is the asteroid belt and the inner planets of the Solar System. Second from top is the proposed inner asteroid belt and planet b of Epsilon Eridani. The lower illustrations show the corresponding features for the two stars' outer systems.".
- Epsilon_Eridani caption "Submillimeter wavelength image of a ring of dust particles around Epsilon Eridani . The brightest areas indicate the regions with the highest concentrations of dust.".
- Epsilon_Eridani class "K2V".
- Epsilon_Eridani colwidth "25".
- Epsilon_Eridani colwidth "50".
- Epsilon_Eridani constell Eridanus_(constellation).
- Epsilon_Eridani direction "vertical".
- Epsilon_Eridani disk "Asteroid belt".
- Epsilon_Eridani disk "Dust disk".
- Epsilon_Eridani eccentricity "0.3".
- Epsilon_Eridani epe "eps+Eridani".
- Epsilon_Eridani epoch Epoch_(astronomy).
- Epsilon_Eridani exoplanet Epsilon_Eridani.
- Epsilon_Eridani exoplanet Epsilon_Eridani_b.
- Epsilon_Eridani group "note".
- Epsilon_Eridani hasPhotoCollection Epsilon_Eridani.
- Epsilon_Eridani image "Epsilon eridani dustring.gif".
- Epsilon_Eridani image "System Epsilon Eridani.JPG".
- Epsilon_Eridani luminosity "0.34".
- Epsilon_Eridani mass "0.1".
- Epsilon_Eridani name "Epsilon Eridani".
- Epsilon_Eridani nsted "eps+Eridani".
- Epsilon_Eridani pError "0.16".
- Epsilon_Eridani parallax "310.94".
- Epsilon_Eridani periapsis "20".
- Epsilon_Eridani periapsis "3".
- Epsilon_Eridani periapsis "35".
- Epsilon_Eridani period "102270".
- Epsilon_Eridani propMoDec "19.49".
- Epsilon_Eridani propMoRa "−975.17".
- Epsilon_Eridani refs "ref|The rotation period Pβ at latitude β is given by: :Pβ = Peq/(1 − k sin β) where Peq is the equatorial rotation period and k is the differential rotation parameter. The value of this parameter is estimated to be in the range: :0.03 ≤ k ≤ 0.10|group="note"|name=rotation".
- Epsilon_Eridani rotation "967680.0".
- Epsilon_Eridani semimajor "40".
- Epsilon_Eridani simbad "HD+22049".
- Epsilon_Eridani uB "+0.571".
- Epsilon_Eridani variable BY_Draconis_variable.
- Epsilon_Eridani width "300".
- Epsilon_Eridani subject Category:Bayer_objects.
- Epsilon_Eridani subject Category:Circumstellar_disks.
- Epsilon_Eridani subject Category:Eridanus_(constellation).
- Epsilon_Eridani subject Category:Gliese_and_GJ_objects.
- Epsilon_Eridani subject Category:HR_objects.
- Epsilon_Eridani subject Category:Henry_Draper_Catalogue_objects.
- Epsilon_Eridani subject Category:Hipparcos_objects.
- Epsilon_Eridani subject Category:K-type_main-sequence_stars.
- Epsilon_Eridani subject Category:Objects_within_100_ly_of_Earth.
- Epsilon_Eridani subject Category:Planetary_systems.
- Epsilon_Eridani subject Category:Solar-type_stars.
- Epsilon_Eridani subject Category:Stars_with_proper_names.
- Epsilon_Eridani type BayerObjects.
- Epsilon_Eridani type CelestialBody109239740.
- Epsilon_Eridani type HIPObjects.
- Epsilon_Eridani type HRObjects.
- Epsilon_Eridani type HenryDraperCatalogueObjects.
- Epsilon_Eridani type K-typeMainSequenceStars.
- Epsilon_Eridani type NaturalObject100019128.
- Epsilon_Eridani type Object100002684.
- Epsilon_Eridani type PhysicalEntity100001930.
- Epsilon_Eridani type Star109444100.
- Epsilon_Eridani type StarsWithProperNames.
- Epsilon_Eridani type Whole100003553.
- Epsilon_Eridani type CelestialBody.
- Epsilon_Eridani type Star.
- Epsilon_Eridani type PhysicalBody.
- Epsilon_Eridani comment "Epsilon Eridani (ε Eri, ε Eridani) 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.".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Epsilon Eridani".
- Epsilon_Eridani label "Épsilon Eridani".
- Epsilon_Eridani label "Эпсилон Эридана".
- Epsilon_Eridani label "エリダヌス座イプシロン星".
- Epsilon_Eridani label "天苑四".
- Epsilon_Eridani sameAs Epsilon_Eridani.