[74], Because of the proximity and Sun-like properties of Epsilon Eridani, in 1985 physicist and author Robert L. Forward considered the system as a plausible target for interstellar travel. If Epsilon Eridani has an Oort cloud, Luyten 726-8 could gravitationally perturb some of its comets with long orbital periods. Hence, the current dust disk must have been created by collisions or other effects of larger parent bodies, and the disk represents a late stage in the planet-formation process. ε Eridani (Latinised to Epsilon Eridani) is the system's Bayer designation (see below). Planets more than 150% as massive as Jupiter can be ruled out at the inner edge of the debris disk at 30–35 AU. [24], The Epsilon Eridani system also includes two belts of rocky asteroids: at about 3 AU and 20 AU from the star. Epsilon Eridani (Latinized from ε Eridani), formally named Ran,[18] is a star in the southern constellation of Eridanus, at a declination of 9.46° south of the celestial equator. startxref The absorption spectrum from this gas has been measured with the Hubble Space Telescope, allowing the properties of the stellar wind to be estimated. This behaviour suggests that the moving group originated in an open cluster that has since diffused. H���}Pw�7�M�B5c���zX����T�������/�R���7E%�D����l6�@$R�1 /!��zz��N��h��qx��y��c��ٙ�����۴w�����ٙ�cg�g����>� �!�@ Xxhϡ��1IY�ʂ�U�eŪ�w�@���[�$���a$XռX���H�@UQp� �8���,eNv����$Z�,!����Pd3���]�H�D��!�)J=�d T��d? endstream endobj 398 0 obj <>/Filter/FlateDecode/Index[22 345]/Length 34/Size 367/Type/XRef/W[1 1 1]>>stream

0000000016 00000 n a#�*��H ��u�E�_O����L�f�l"a���X�7 b�C+σ+�zH. [107], Computer simulations of the dusty disk orbiting Epsilon Eridani suggest that the shape of the disk may be explained by the presence of a second planet, tentatively dubbed Epsilon Eridani c. Clumping in the dust disk may occur because dust particles are being trapped in orbits that have resonant orbital periods with a planet in an eccentric orbit. [28][better source needed] From Epsilon Eridani, the Sun would appear as a 2.4-magnitude star in Serpens. for the academic world: for school, primary, secondary, high school, middle, technical degree, college, university, undergraduate, master's or doctoral degrees; 1@

Despite being a relatively bright star, it was not given a proper name by early astronomers. It's free to use and each article or document can be downloaded. [96] Epsilon Eridani's hot corona results in a mass loss rate in Epsilon Eridani's stellar wind that is 30 times higher than the Sun's.

[96], The stellar wind emitted by Epsilon Eridani expands until it collides with the surrounding interstellar medium of diffuse gas and dust, resulting in a bubble of heated hydrogen gas (an astrosphere, the equivalent of the heliosphere that surrounds the Sun). 0000011499 00000 n [93], The X-ray luminosity of Epsilon Eridani is about 2 × 1028 ergs/s (2 × 1021 W).

She stirs up the tempests that swallow ships beneath the angry waves, or shatters their hulls against the jagged rocks lurking beneath the swells. Because no such correlation was found, a planetary companion was deemed the most likely cause. [31] In December 2015, the IAU announced the winning names were Ran for the star and AEgir [sic] for the planet. [6] Measurement of this rotational modulation suggests that its equatorial region rotates with an average period of 11.2 days,[16] which is less than half of the rotation period of the Sun.

Here you can see how to pronounce these names in a British English style. [16], The high levels of chromospheric activity, strong magnetic field, and relatively fast rotation rate of Epsilon Eridani are characteristic of a young star. 0000012270 00000 n With a declination of −9.46°, Epsilon Eridani can be viewed from much of Earth's surface, at suitable times of year. [26], As one of the nearest Sun-like stars with a planet,[27] Epsilon Eridani has been the target of several observations in the search for extraterrestrial intelligence. [8][105], If the planet exists, its mass remains unknown, but a lower limit can be estimated based on the orbital displacement of Epsilon Eridani. Flyting or fliting is a contest consisting of the exchange of insults, often conducted in verse, between two parties. No signals of intelligent extraterrestrial origin were detected. 0000012855 00000 n [102], Epsilon Eridani made its closest approach to the Sun about 105,000 years ago, when they were separated by 7 ly (2.1 pc). [19][100] The estimated age of this group is 500±100 million years,[101] which lies within the range of the age estimates for Epsilon Eridani. [37][44] The star catalogue of English astronomer John Flamsteed, published in 1712, gave Epsilon Eridani the Flamsteed designation of 18 Eridani, because it was the eighteenth catalogued star in the constellation of Eridanus by order of increasing right ascension. {�����0F��8�F�. [46][47][48], In 1801 Epsilon Eridani was included in Histoire Céleste Française, Joseph Jérôme Lefrançois de Lalande's catalogue of about 50,000 stars, based on his observations of 1791–1800, in which observations are arranged in time order. 0000014446 00000 n In Norse mythology, Aegir and Ran are a married couple that lives under the sea. Their model suggested that the clumping of the dust particles could be explained by the presence of a second planet in an eccentric orbit, which they announced in 2002. Here is the definition, explanation, description, or the meaning of each significant on which you need information, and a list of their associated concepts as a glossary. [15] The proportion of lithium in the atmosphere is five times less than that in the Sun.

At a distance of 10.5 light-years (3.2 parsecs) from the Sun, it has an apparent magnitude of 3.73. The star is estimated to be less than a billion years old. 0000001964 00000 n Upon its discovery, the planet was designated Epsilon Eridani b, following the usual designation system for extrasolar planets. Bode assigned Epsilon Eridani magnitude 3. 0000015040 00000 n 0000002676 00000 n Bode's catalogue was based on observations of various astronomers, including Bode himself, but mostly on Lalande's and Lacaille's (for the southern sky). [72], In Habitable Planets for Man, a 1964 RAND Corporation study by space scientist Stephen H. Dole, the probability of a habitable planet being in orbit around Epsilon Eridani were estimated at 3.3%. [19] The low abundance of heavy elements in the chromosphere of Epsilon Eridani usually indicates an older star, because the interstellar medium (out of which stars form) is steadily enriched by heavier elements produced by older generations of stars. As Epsilon Eridani ages over a period of 20 billion years, the net luminosity will increase, causing this zone to slowly expand outward to about 0.6–1.4 AU. ���۹��X��U��"�w��M�a=�᫂�S5�^���X&�Cmv���������d��W�8m�QK+����fUe[����!�����J{X��x� �Wh8Þ=C��n�� �Q�+����ح��89w@N%�c5�@/�ɰ�c���j������M�m,�M�-

[90] Photometry has also shown that the surface of Epsilon Eridani, like the Sun, is undergoing differential rotation i.e. %%EOF 0000011033 00000 n trailer 0000009606 00000 n xref endstream endobj 368 0 obj <>/Metadata 20 0 R/Pages 19 0 R/StructTreeRoot 22 0 R/Type/Catalog/ViewerPreferences<>>> endobj 369 0 obj <>/Font<>/ProcSet[/PDF/Text]>>/Rotate 0/StructParents 0/TrimBox[0.0 0.0 595.276 841.89]/Type/Page>> endobj 370 0 obj <> endobj 371 0 obj <> endobj 372 0 obj <> endobj 373 0 obj <>stream Brahe assigned it magnitude 3.

[20] 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 (8,500 °F), giving it an orange hue. [53] In 1918 Epsilon Eridani appeared in the Henry Draper Catalogue with the designation HD 22049 and a preliminary spectral classification of K0. 0000001391 00000 n [87] The magnetic properties can be modelled by assuming that regions with a magnetic flux of about 0.14 T randomly cover approximately 9% of the photosphere, whereas the remainder of the surface is free of magnetic fields. pronunciation guide Tales of Norse gods and heroes have been passed down in many countries for more than a thousand years. ���!Ӎ�Gy�qb����Q2�>�V����G�m0z�H�yw\:?���o'�,H�Et�ϖ&RR�L-Y��l��V$H�SR���p����Sѩqhj��Ծ,.�Α�l�% This process involves recording the position of Epsilon Eridani as Earth moves around the Sun, which allows a star's distance to be estimated. New!! 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. They will be less than 1 ly (0.3 parsecs) apart for about 4,600 years. This makes interpretation of periodicities in the radial velocity of Epsilon Eridani, such as those caused by an orbiting planet, more difficult. Epsilon Eridani is number 89 in hour 3. [108][109] The disk around Epsilon Eridani contains less than 2.2 × 1017 kg of carbon monoxide. Epsilon Eridani (Latinized from ε Eridani), formally named Ran, is a star in the southern constellation of Eridanus, at a declination of 9.46° south of the celestial equator.This allows it to be visible from most of Earth's surface.

0000007871 00000 n [9] Its proximity makes it one of the most studied stars of its spectral type. 0000021431 00000 n [1][note 5] The star has a radial velocity of +15.5 km/s (35,000 mph) (away from the Sun). Google Play, Android and the Google Play logo are trademarks of Google Inc. Rán and Henry Adams Bellows (businessman), Rán and Viking Society for Northern Research, Creative Commons Attribution-ShareAlike License. [52] In 1814 Giuseppe Piazzi published the second edition of his star catalogue (its first edition was published in 1803), based on observations during 1792–1813, in which more than 7000 stars were grouped into 24 hours (0–23). It gives a brief definition of each concept and its relationships. 0000024004 00000 n It is thought that the temple dedicated to her cult was in the northern part of the city.

�pA�����4 [note 2] Bayer assigned Epsilon Eridani magnitude 3.

[15] In Epsilon Eridani's chromosphere, a region of the outer atmosphere just above the light emitting photosphere, the abundance of iron is estimated at 74% of the Sun's value. In its first bulletin of July 2016,[34] the WGSN explicitly recognised the names of exoplanets and their host stars that were produced by the competition. Submillimeter wavelength image of a ring of dust particles around Epsilon Eridani (above centre). The clumping in the dust distribution could be explained by gravitational interactions with a planet orbiting just inside the dust ring. [91] Most estimates of the age of Epsilon Eridani place it in the range from 200 million to 800 million years. [75][76][121], The orbital radius at which the stellar flux from Epsilon Eridani matches the solar constant—where the emission matches the Sun's output at the orbital distance of the Earth—is 0.61 astronomical units (AU). The energy released by fusion is transported outward from the core through radiation, which results in no net motion of the surrounding plasma. Although this system was not chosen as a primary candidate for the now-canceled Terrestrial Planet Finder, it was a target star for NASA's proposed Space Interferometry Mission to search for Earth-sized planets. From Epsilon Eridani, the Sun would appear on the diametrically opposite side of the sky at the coordinates RA=, This is because Bayer designated 21 stars in the northern part of Eridanus by preceding along the 'river' from east to west, starting from β (, 1796 September 17 (page 246), 1796 December 3 (page 248) and 1797 November 13 (page 307).

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