Английская Википедия:55 Cancri f
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet 55 Cancri f (abbreviated 55 Cnc f), also designated Rho1 Cancri f and formally named Harriot Шаблон:IPAc-en,[1] is an exoplanet approximately 41 light-years away from Earth in the constellation of Cancer (the Crab). 55 Cancri f is the fourth known planet (in order of distance) from the star 55 Cancri and the first planet to have been given the designation of "f".[2]
Name
In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[3] The process involved public nomination and voting for the new names.[4] In December 2015, the IAU announced the winning name was Harriot for this planet.[5] The winning name was submitted by the Royal Netherlands Association for Meteorology and Astronomy of the Netherlands. It honors the astronomer Thomas Harriot.[6]
Discovery
The initial presentation of this planet occurred at a meeting of the American Astronomical Society in April 2005,[7] however it was another two and a half years before the planet was to be published in a peer-reviewed journal.[8] It is the first known planet outside the Solar System to spend its entire orbit within what astronomers call the "habitable zone".[9] Furthermore, its discovery made 55 Cancri the first star other than the Sun known to have at least five planets.
Orbit and mass
55 Cancri f is located about 0.781 AU away from the star and takes 262 days to complete a full orbit.[10] A limitation of the radial velocity method used to detect 55 Cancri f is that only a minimum mass can be obtained, in this case around 0.144 times that of Jupiter, or half the mass of Saturn.[10] A Keplerian fit to the radial velocity data of 55 Cancri A indicates that the orbit is consistent with being circular, however changing the value in a range between 0 and 0.4 does not significantly alter the chi-squared statistic of the fit, thus a representative eccentricity of 0.2±0.2 was assumed.[8] In a Newtonian model which takes interactions between the planets into account, the eccentricity comes out as 0.0002, almost perfectly circular.[8]
Astrometric observations made with the Hubble Space Telescope suggest that the outer planet 55 Cancri d is inclined at 53° with respect to the plane of the sky.[11] The inner planets b and e are inclined at 85°. The inclination of f is unknown.
Characteristics
Since the planet was detected indirectly through observations of its star, properties such as its radius, composition and temperature are unknown. With a mass half that of Saturn,[10] 55 Cancri f is likely to be a gas giant with no solid surface. It orbits in the so-called "habitable zone," which means that liquid water and life could exist on the surface of a possible moon or moons.[9]
It is not known if the composition and appearance is more like that of Saturn or Neptune.[2]
See also
References
External links
Шаблон:55 Cancri Шаблон:Stars of Cancer Шаблон:Portal bar Шаблон:Sky
- ↑ Шаблон:Cite web
- ↑ 2,0 2,1 Шаблон:Cite web
- ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ↑ Шаблон:Cite web
- ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ 8,0 8,1 8,2 Ошибка цитирования Неверный тег
<ref>; для сносокfischer08не указан текст - ↑ 9,0 9,1 Шаблон:Cite news
- ↑ 10,0 10,1 10,2 Шаблон:Cite web
- ↑ Шаблон:Cite journal
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