Kepler-11: Razlika med redakcijama
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Redakcija: 23:46, 3. februar 2011
| Opazovalni podatki Epoha J2000 Enakonočje J2000 | |
|---|---|
| Ozvezdje | Cygnus |
| Rektascenzija | 19h 48m 27.62s |
| Deklinacija | +41° 54′ 32.9″ |
| Navidezni sij (V) | 14.2[1] |
| Astrometrija | |
| Oddaljenost | 613[1] pc |
| Značilnosti | |
| Spektralni razred | GV[2] |
| Podrobnosti | |
| Masa | 0.95 (± 0.1)[3] M☉ |
| Polmer | 1.1 (± 0.1)[3] R☉ |
| Temperatura | 5680 (± 100)[3] K |
| Kovinskost | [Fe/H] = 0 (± 0.1)[3] |
| Starost | 8 (± 2)[3] Ga |
| Druge oznake | |
Predloga:KIC, KOI-157[1] | |
Kepler-11 is a Sun-like star with a confirmed system of at least six exoplanets with short-period orbits, announced on 2 February, 2011.[2] It is in the direction of the constellation Cygnus and about 2,000 light years distant. It was discovered by the Small Sky Survey of the 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 transiting and is also the most compact known system.[4] 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;[5] a significant hydrogen atmosphere is indicated for planets d, e and perhaps f, while b and c probably contain substantial amounts of ices and/or H/He.[2]
| Planet | Mass (ME) |
Radius (RE) |
Density (g/cm3) |
Orbital period (d) |
Semimajor axis (AU) |
Orbital ecc. |
Inc. (°) |
Discovery year | |
|---|---|---|---|---|---|---|---|---|---|
| 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[3] | |
| c | 13.5 (7.4 - 18.3) | 3.15 ± 0.30 | 2.3 (1.2 - 3.6) | 13.02502 | 0.106 | 0 | 89 | 2011[3] | |
| 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[3] | |
| 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[3] | |
| 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[3] | |
| g | < 300 (0.95 MJ) | 3.66 ± 0.35 | 118.37774 | 0.462 | 0 | 89.8 | 2011[3] | ||
 Relative size and positions of the 6 planets of Kepler-11 (The star a in yellow has a true scale diameter, while planet diameters are scaled up by a factor of 50) | |||||||||
See also
References
- ↑ 1,0 1,1 1,2 »Kepler Discoveries«. NASA Ames Research Center. Pridobljeno 2. februarja 2011.
- ↑ 2,0 2,1 2,2 Lissauer, J. J. (3. februar 2011). »A closely packed system of low-mass, low-density planets transiting Kepler-11« (PDF). Nature. Nature Publishing Group. 470: 53–58. doi:10.1038/nature09760. Pridobljeno 2. februarja 2011.
{{navedi časopis}}: Prezrt neznani parameter|coauthors=(predlagano je|author=) (pomoč) - ↑ 3,00 3,01 3,02 3,03 3,04 3,05 3,06 3,07 3,08 3,09 3,10 »Star : Kepler-11«. Extrasolar Planets Encyclopaedia. Pridobljeno 2. februarja 2011.
- ↑ Nasa Report
- ↑ Boyle, Alan (2. februar 2011). »Planetary six-pack poses a puzzle«. MSNBC Cosmic Log. msnbc.com. Pridobljeno 2. februarja 2011.
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