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Coordinates: Sky map 03h 34m 36.23s, +20° 35′ 57.2″
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{{Short description|Extrasolar planet in the constellation Aries}}
⚫
'''BD+20594b''' (Also known as '''K2-56b'''<ref>{{cite web| url = http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=k2-56+b&type=CONFIRMED_PLANET | title = CONFIRMED PLANET OVERVIEW PAGE | website = NASA Exoplanet Archive | publisher = NASA | access-date = 2016-08-11}}</ref>) is an [[exoplanet]] discovered by the [[Kepler (spacecraft)|Kepler spacecraft]] in collaboration with the [[HARPS]] [[spectrometer]] at La Silla in [[Chile]].
{{Infobox planet
| name = BD +20° 594 b
| discovery_site = [[Kepler (spacecraft)|Kepler Space Observatory]], La Silla, Chile
| discovered = 2016
| discovery_method = Transit
| apsis = astron
| semimajor = 0.241 {{±|0.019|0.017}}<ref name=NasaExoplanetArchive/> [[astronomical unit|AU]]
| eccentricity = 0<ref name=NasaExoplanetArchive/>
| period = 41.6855 {{±|0.0030|0.0031}}<ref name=NasaExoplanetArchive/> [[day|d]]
| inclination = {{val|89.55|+0.17|-0.14}}<ref name=NasaExoplanetArchive/>
| star = [[BD+20°594]]
| mean_radius = {{val|2.23|+0.14|-0.11}}<ref name=NasaExoplanetArchive/> {{Earth radius|link=y}}
⚫
| mass = 16.3 {{±|6.0|6.1}}<ref name=NasaExoplanetArchive>{{cite web| url = http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=k2-56+b&type=CONFIRMED_PLANET | title = CONFIRMED PLANET OVERVIEW PAGE | website = NASA Exoplanet Archive | publisher = NASA | access-date = 2016-08-11}}</ref> {{Earth mass|link=y}}
| density = {{val|7.890|+3.400|-3.100}} [[gram|g]] [[cubic centimetre|cm<sup>−3</sup>]]
| single_temperature = {{convert|546|K|C F}} {{±|19|18}} [[Kelvin|K]]
}}
'''BD+ 20''°'' 594b''' (also known as '''K2-56b'''<ref name=NasaExoplanetArchive/>) is a massive [[exoplanet]] discovered by the [[Kepler (spacecraft)|Kepler spacecraft]] in collaboration with the [[HARPS]] [[spectrometer]] at La Silla in [[Chile]].


==Naming==
⚫
BD+20594b is substantially smaller than [[Neptune]] with a radius of 2.2 R<sub>e</sub> and a mass of 16.31 M<sub>e</sub>.<ref>http://exoplanet.eu/catalog/bd%2B20_594_b/</ref> Taking the estimates on its radius and mass at face value, the composition of the planet would be rocky, hence making it classified as a [[Mega-Earth]]. BD+20594b's exact composition is still unknown.
BD+20 594b indicates that the planet circles a star found in the [[Bonner Durchmusterung]] catalogue, ''BD +20° 594'', the 594th entry in the +20-degree zone (declinations from +19 to +20 degrees),<ref>{{cite web|url=http://vizier.u-strasbg.fr/cgi-bin/Dic-Simbad?BD|title=Dictionary of Nomenclature of Celestial Objects: Details on Acronym: BD|date=2020-09-20|website=[[SIMBAD]]|publisher=[[Centre de Données astronomiques de Strasbourg]]| url-status=live|archive-url=https://web.archive.org/web/20201006034506/http://cdsweb.u-strasbg.fr/cgi-bin/Dic-Simbad?BD| archive-date=2020-10-06}}</ref> and that it is the first planet discovered orbiting that star.


K2-56b indicates that the planet circles a star catalogued in the Kepler 2 mission catalogue (part of the extended K2 [[Kepler (spacecraft)|Kepler mission]]), the 56th one in the catalogue,<ref>{{cite web|url=https://exoplanetarchive.ipac.caltech.edu/docs/K2Numbers.html|title=K2 Confirmed Planet and Candidate Naming Policy|date=2022-01-24|website=[[NASA Exoplanet Archive]]|publisher=[[NASA]]|access-date=2024-05-09}}</ref> and that it is the first planet discovered orbiting that star.
The planet was first discovered on January 28, 2016 by astrophysicist Néstor Espinoza and his team from the [[Catholic University of Chile]], using data from the two-wheeled Kepler mission (K2). It orbits a K-type star 496.08 light years away in the [[constellation]] [[Taurus constellation|Taurus]].<ref>[http://arxiv.org/abs/1601.07608 A Neptune-sized Exoplanet Consistent with a Pure Rock Composition]</ref>


==Planet==
It is believed that most planets with a radius greater than 1.6 times the Earth are not usually rocky,<ref>[http://arxiv.org/abs/1407.4457 Most 1.6 Earth-Radius Planets are not Rocky]</ref> making BD+20594b an exception to this rule along with [[Kepler-10c]] and [[K2-3d]].
⚫
With a radius of 2.2 R<sub>🜨</sub> and a mass of 16.31 M<sub>🜨</sub>, BD+20594b is substantially smaller than [[Neptune]].<ref>{{cite encyclopedia |url=https://exoplanet.eu/catalog/bd_20_594_b--2546/ |encyclopedia=[[Extrasolar Planets Encyclopaedia]] |title=Planet BD+20 594 b |date=2016 }}</ref> Taking the estimates of its radius and mass at face value, the composition of the planet would be rocky, hence making it classified as a [[mega-Earth]]. BD+20594b's exact composition is still unknown.

The planet was discovered on January 28, 2016 by astrophysicist Néstor Espinoza and his team from the [[Catholic University of Chile]], using data from the two-wheeled Kepler mission (K2). It orbits a K-type star 496.08 light years away in the [[constellation]] [[Taurus constellation|Taurus]].<ref>{{Cite journal |arxiv = 1601.07608|bibcode = 2016ApJ...830...43E|title = Discovery and Validation of a High-Density sub-Neptune from the K2 Mission|journal = The Astrophysical Journal|volume = 830|issue = 1|pages = 43|last1 = Espinoza|first1 = Néstor|last2 = Brahm|first2 = Rafael|last3 = Jordán|first3 = Andrés|last4 = Jenkins|first4 = James S|last5 = Rojas|first5 = Felipe|last6 = Jofré|first6 = Paula|last7 = Mädler|first7 = Thomas|last8 = Rabus|first8 = Markus|last9 = Chanamé|first9 = Julio|last10 = Pantoja|first10 = Blake|last11 = Soto|first11 = Maritza G|last12 = Morzinski|first12 = Katie M|last13 = Males|first13 = Jared R|last14 = Ward-Duong|first14 = Kimberly|last15 = Close|first15 = Laird M|year = 2016|doi = 10.3847/0004-637X/830/1/43|s2cid = 119118301 | doi-access=free }}</ref>

It is believed that planets with a radius greater than 1.6 times the Earth's are not usually rocky,<ref>{{Cite journal |arxiv = 1407.4457|bibcode = 2015ApJ...801...41R|title = Most 1.6 Earth-radius Planets are Not Rocky|journal = The Astrophysical Journal|volume = 801|issue = 1|pages = 41|last1 = Rogers|first1 = Leslie A|last2 = Brahm|first2 = Rafael|last3 = Jordán|first3 = Andrés|last4 = Jenkins|first4 = James S|last5 = Rojas|first5 = Felipe|last6 = Jofré|first6 = Paula|last7 = Mädler|first7 = Thomas|last8 = Rabus|first8 = Markus|last9 = Chanamé|first9 = Julio|last10 = Pantoja|first10 = Blake|last11 = Soto|first11 = Maritza G|last12 = Morzinski|first12 = Katie M|last13 = Males|first13 = Jared R|last14 = Ward-Duong|first14 = Kimberly|last15 = Close|first15 = Laird M|year = 2015|doi = 10.1088/0004-637X/801/1/41|s2cid = 9472389}}</ref> making BD+20594b an exception to this rule.


==See also==
==See also==
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==References==
==References==
{{Reflist}}
{{reflist}}

==External links==
*[http://www.universetoday.com/127325/largest-rocky-world-found Largest Rocky World Found - Universe Today]
*[http://www.universetoday.com/127325/largest-rocky-world-found Largest Rocky World Found - Universe Today]

{{Exoplanet}}
{{Exoplanet}}
{{2016 in space}}
{{2016 in space}}{{Taurus (constellation)}}{{sky|03|34|36.23|+|20|35|57.2|496.08}}


{{DEFAULTSORT:K2-56b}}
[[Category:Aries (constellation)]]
[[Category:Taurus (constellation)]]
[[Category:Exoplanets discovered in 2016]]
[[Category:Exoplanets discovered in 2016]]
[[Category:Transiting exoplanets]]
[[Category:Transiting exoplanets]]
[[Category:Mega-Earths]]

[[Category:Exoplanets discovered by K2]]




Latest revision as of 13:54, 13 May 2024

BD +20° 594 b
Discovery
Discovery siteKepler Space Observatory, La Silla, Chile
Discovery date2016
Transit
Orbital characteristics
0.241 +0.019
−0.017[1] AU
Eccentricity0[1]
41.6855 +0.0030
−0.0031[1] d
Inclination89.55+0.17
−0.14[1]
StarBD+20°594
Physical characteristics
2.23+0.14
−0.11[1] R🜨
Mass16.3 +6.0
−6.1[1] ME
Mean density
7.890+3.400
−3.100 g cm−3
Temperature546 K (273 °C; 523 °F) +19
−18 K

BD+ 20° 594b (also known as K2-56b[1]) is a massive exoplanet discovered by the Kepler spacecraft in collaboration with the HARPS spectrometer at La Silla in Chile.

Naming

[edit]

BD+20 594b indicates that the planet circles a star found in the Bonner Durchmusterung catalogue, BD +20° 594, the 594th entry in the +20-degree zone (declinations from +19 to +20 degrees),[2] and that it is the first planet discovered orbiting that star.

K2-56b indicates that the planet circles a star catalogued in the Kepler 2 mission catalogue (part of the extended K2 Kepler mission), the 56th one in the catalogue,[3] and that it is the first planet discovered orbiting that star.

Planet

[edit]

With a radius of 2.2 R🜨 and a mass of 16.31 M🜨, BD+20594b is substantially smaller than Neptune.[4] Taking the estimates of its radius and mass at face value, the composition of the planet would be rocky, hence making it classified as a mega-Earth. BD+20594b's exact composition is still unknown.

The planet was discovered on January 28, 2016 by astrophysicist Néstor Espinoza and his team from the Catholic University of Chile, using data from the two-wheeled Kepler mission (K2). It orbits a K-type star 496.08 light years away in the constellation Taurus.[5]

It is believed that planets with a radius greater than 1.6 times the Earth's are not usually rocky,[6] making BD+20594b an exception to this rule.

See also

[edit]

References

[edit]
  1. ^ a b c d e f g "CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. NASA. Retrieved 2016-08-11.
  2. ^ "Dictionary of Nomenclature of Celestial Objects: Details on Acronym: BD". SIMBAD. Centre de Données astronomiques de Strasbourg. 2020-09-20. Archived from the original on 2020-10-06.
  3. ^ "K2 Confirmed Planet and Candidate Naming Policy". NASA Exoplanet Archive. NASA. 2022-01-24. Retrieved 2024-05-09.
  4. ^ "Planet BD+20 594 b". Extrasolar Planets Encyclopaedia. 2016.
  5. ^ Espinoza, Néstor; Brahm, Rafael; Jordán, Andrés; Jenkins, James S; Rojas, Felipe; Jofré, Paula; Mädler, Thomas; Rabus, Markus; Chanamé, Julio; Pantoja, Blake; Soto, Maritza G; Morzinski, Katie M; Males, Jared R; Ward-Duong, Kimberly; Close, Laird M (2016). "Discovery and Validation of a High-Density sub-Neptune from the K2 Mission". The Astrophysical Journal. 830 (1): 43. arXiv:1601.07608. Bibcode:2016ApJ...830...43E. doi:10.3847/0004-637X/830/1/43. S2CID 119118301.
  6. ^ Rogers, Leslie A; Brahm, Rafael; Jordán, Andrés; Jenkins, James S; Rojas, Felipe; Jofré, Paula; Mädler, Thomas; Rabus, Markus; Chanamé, Julio; Pantoja, Blake; Soto, Maritza G; Morzinski, Katie M; Males, Jared R; Ward-Duong, Kimberly; Close, Laird M (2015). "Most 1.6 Earth-radius Planets are Not Rocky". The Astrophysical Journal. 801 (1): 41. arXiv:1407.4457. Bibcode:2015ApJ...801...41R. doi:10.1088/0004-637X/801/1/41. S2CID 9472389.
[edit]


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