Kepler-11: Razlika med redakcijama
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'''Kepler-11''' is a [[Sun]]-like star with a confirmed system of at least six [[exoplanet]]s with short-period orbits, announced on 2 February, 2011.<ref name = "Lissauer">{{Cite journal
| last = Lissauer | first = J. J. | authorlink = Jack J. Lissauer | coauthors = ''et al.''
| title = A closely packed system of low-mass, low-density planets transiting Kepler-11
| journal = [[Nature (journal)|Nature]] | volume = 470| issue = | pages = 53–58
| publisher = [[Nature Publishing Group]] | location = | date = 2011-02-03 | url = http://arxiv.org/pdf/1102.0291v1.pdf | issn =
| doi = 10.1038/nature09760| id = | accessdate = 2011-02-02}}</ref> It is in the direction of the constellation [[Cygnus_(constellation)|Cygnus]] and about 2,000 light years distant. It was discovered by the Small Sky Survey of the [[Kepler (spacecraft)|Kepler space telescope]]. All six planets transit the star's disk as viewed from the Earth's perspective. This allows, via monitoring of the eclipsing of the star by the planets, direct measurements of the planets' periods and diameters. Kepler-11 is the first discovered exoplanetary system with more than three planets [[Methods_of_detecting_extrasolar_planets#Transit_method|transiting]] and is also the most compact known system.<ref>[http://www.nasa.gov/mission_pages/kepler/news/new_planetary_system.html Nasa Report]</ref> The planets are named alphabetically, starting with the innermost: ''b'', ''c'', ''d'', ''e'', ''f'', and ''g''.
== Planets ==
The low density estimates of planets ''b''-''f'' imply that none of them have an Earth-like composition;<ref name = "Boyle">{{Cite web
| last = Boyle | first = Alan | authorlink = Alan Boyle
| title = Planetary six-pack poses a puzzle
| work = [http://cosmiclog.msnbc.msn.com/ MSNBC Cosmic Log]
| publisher = [[msnbc.com]] | date = 2011-02-02
| url = http://cosmiclog.msnbc.msn.com/_news/2011/02/01/5972312-planetary-six-pack-poses-a-puzzle
| format = | doi = | accessdate = 2011-02-02}}</ref> a significant [[hydrogen]] atmosphere is indicated for planets ''d'', ''e'' and perhaps ''f'', while ''b'' and ''c'' probably contain substantial amounts of [[Volatiles|ices]] and/or H/[[helium|He]].<ref name = "Lissauer"/>
{| class="toccolours sortable" border=1 cellspacing=0 cellpadding=2 align=center style="text-align:center; border-collapse:collapse; margin-left: 0; margin-right: auto;"
|- bgcolor="#a0b0ff"
! [[Planet]]
! [[Mass]]<br /><small>([[Earth mass|M<sub>E</sub>]])</small>
! [[Radius]]<br /><small>([[Earth radius|R<sub>E</sub>]])</small>
! [[Density]]<br /><small>(g/cm<sup>3</sup>)</small>
! [[Orbital period|Orbital<br />period]]<br /><small>([[day|d]])</small>
! [[Semimajor axis|Semimajor<br />axis]]<br /><small>([[Astronomical unit|AU]])</small>
! [[Eccentricity (orbit)|Orbital<br />ecc.]]
! [[Inclination|Inc.]]<br /><small>([[degree (angle)|°]])</small>
! Discovery<br />year
|-
! [[Kepler-11b|b]]
|| 4.3 (2.3 - 6.5) || 1.97 ± 0.19 || 3.1 (1.6 - 5.2) ||10.30375 || 0.091 || 0 || 88.5 || 2011<ref name="EPE2">{{cite web|title=Star : Kepler-11|publisher=Extrasolar Planets Encyclopaedia|url=http://exoplanet.eu/star.php?st=Kepler-11#a_publi|accessdate=2011-02-02}}</ref>
|-
! [[Kepler-11c|c]]
|| 13.5 (7.4 - 18.3) || 3.15 ± 0.30 || 2.3 (1.2 - 3.6) ||13.02502 || 0.106 || 0 || 89 || 2011<ref name="EPE2"/>
|-
! [[Kepler-11d|d]]
|| 6.1 (4.4 - 9.2) || 3.43 ± 0.32 || 0.9 (0.6 - 1.4) ||22.68719 || 0.159 || 0 || 89.3 || 2011<ref name="EPE2"/>
|-
! [[Kepler-11e|e]]
|| 8.4 (6.5 - 10.9) || 4.52 ± 0.43 || 0.5 (0.3 - 0.7) ||31.9959 || 0.194 || 0 || 88.8 || 2011<ref name="EPE2"/>
|-
! [[Kepler-11f|f]]
|| 2.3 (1.1 - 4.5) || 2.61 ± 0.25 || 0.7 (0.3 - 1.4) ||46.68876 || 0.25 || 0 || 89.4 || 2011<ref name="EPE2"/>
|-
! [[Kepler-11g|g]]
|| < 300 (0.95 [[Jupiter mass|M<sub>J</sub>]]) || 3.66 ± 0.35 || ||118.37774 || 0.462 || 0 || 89.8 || 2011<ref name="EPE2"/>
|-
|colspan=10|[[File:Kepler11 system sideview.png|640px]]<BR>Relative size and positions of the 6 planets of Kepler-11<BR>(The star ''a'' in yellow has a true scale diameter, while planet diameters are scaled up by a factor of 50)
|}
== See also ==
* [[List of extrasolar planets]]
* [[Kepler Mission]]
== References ==
{{Reflist}}
[[Category:Exoplanets]]
[[Category:Stars]]
{{Exoplanet-stub}}
== External links==
* [http://www.nasa.gov/mission_pages/kepler/news/new_planetary_system.html Official release: NASA's Kepler Spacecraft Discovers Extraordinary New Planetary System]
* [http://www.youtube.com/watch?v=c8Ipowj6X5s YouTube: Animation of Kepler-11 planetary system]
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