55 Cancri f: Difference between revisions
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== Characteristics == |
== Characteristics == |
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Since the planet was detected indirectly through observations of its star, properties such as its [[radius]], composition and [[temperature]] are unknown. With a mass similar to that of Saturn, 55 Cancri f is likely to be a [[gas giant]] with no solid surface. Orbiting |
Since the planet was detected indirectly through observations of its star, properties such as its [[radius]], composition and [[temperature]] are unknown. With a mass similar to that of [[Saturn]], 55 Cancri f is likely to be a [[gas giant]] with no solid surface. Orbiting through 55 Cancri A's so-called "[[habitable zone]]," but receiving more [[insolation]] than [[Venus]] at [[Perihelion]], [[Extraterrestrial liquid water|liquid water]] is not likey to exist on any moons it might have. |
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=== Insolation recieved by 55 Cancri f === |
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''Main articles: [[thermodynamic equilibrium]] & [[Climate_model#Zero-dimensional_models|Climate modeling]]'' |
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! [[Insolation]] (W/m<sup>2</sup>) |
! [[Insolation]] (W/m<sup>2</sup>) |
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! % of Earth's |
! % of Earth's |
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| Mars' Aphelion Flux || 494.00||36.06% |
| Mars' Aphelion Flux || 494.00||36.06% |
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| '''55 Cnc f''' Average Flux ||547.395|| 39.99% |
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| Mars' Average Flux ||590.589 ||43.11% |
| Mars' Average Flux ||590.589 ||43.11% |
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| Mars' Perihelion Flux ||718.545 ||52.45% |
| Mars' Perihelion Flux ||718.545 ||52.45% |
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| Earth's Aphelion Flux ||1325.277 || 93.74% |
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| Earth's |
| Earth's Average Flux ||1366.078 || 100.00% |
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| '''55 Cancri f''' Apastron Flux || '''1396.446''' || '''102.22%''' |
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| Earth's Perihelion Flux ||1416.896|| 103.43% |
| Earth's Perihelion Flux ||1416.896|| 103.43% |
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| Venus' Aphelion Flux ||2,585.411||188.72% |
| Venus' Aphelion Flux ||2,585.411||188.72% |
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| Venus' Perihelion Flux ||2,656.700||193.93% |
| Venus' Perihelion Flux ||2,656.700||193.93% |
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| '''55 Cancri f''' Periastron Flux ||'''3142.004''' <ref><math>f_p= \frac{( (1.15\times 6.955 \times 10^8 )^2 ) \times (5.67051 \times 10^{-8}) \times (5243^4)} { ( ( 0.781- ( 0.781\times 0.2 ) ) \times 149597876600 )^2 }</math></ref>||'''230.00%''' |
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[1] f<sub>p</sub>=((((0.6 × 6.96e8)<sup>4</sup>)×(5.6704e-8)×(5243<sup>4</sup>)) ÷ ((0.781-(0.781×0.2))×149597876600)<sup>2</sup> |
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== References == |
== References == |
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Revision as of 03:39, 21 July 2008
Template:Planetbox begin Template:Planetbox image Template:Planetbox star Template:Planetbox orbit Template:Planetbox character Template:Planetbox discovery Template:Planetbox catalog Template:Planetbox end
55 Cancri f, also cataloged as Rho1 Cancri f, is an extrasolar planet approximately 41 light-years away 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 is currently the only planet to have been given the designation of "F". Orbiting its star at about 0.78 astronomical units and taking approximately 260 days to complete its orbit, it is speculated that the planet may be a planet with an insolation similar to either the Earth or Venus.[1]
Discovery
The initial presentation of this planet occurred at a meeting of the American Astronomical Society in April 2005,[2] however it was another two and a half years before the planet was to be published in a peer-reviewed journal. Unlike the majority of known extrasolar planets, 55 Cancri f was detected by a third party, by reviewing already-published data on the star and analysing observed changes in its radial velocity (obtained by measuring of the Doppler shift of the star's spectrum).
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 similar to that of Saturn, 55 Cancri f is likely to be a gas giant with no solid surface. Orbiting through 55 Cancri A's so-called "habitable zone," but receiving more insolation than Venus at Perihelion, liquid water is not likey to exist on any moons it might have.
Insolation recieved by 55 Cancri f
Main articles: thermodynamic equilibrium & Climate modeling
| Planet Distance | Insolation (W/m2) | % of Earth's
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|---|---|---|
| Mars' Aphelion Flux | 494.00 | 36.06% |
| Mars' Average Flux | 590.589 | 43.11% |
| Mars' Perihelion Flux | 718.545 | 52.45% |
| Earth's Aphelion Flux | 1325.277 | 93.74% |
| Earth's Average Flux | 1366.078 | 100.00% |
| 55 Cancri f Apastron Flux | 1396.446 | 102.22% |
| Earth's Perihelion Flux | 1416.896 | 103.43% |
| 55 Cancri f Average Flux | 2010.882 | 147.20% |
| Venus' Aphelion Flux | 2,585.411 | 188.72% |
| Venus' Average Flux | 2,620.693 | 191.30% |
| Venus' Perihelion Flux | 2,656.700 | 193.93% |
| 55 Cancri f Periastron Flux | 3142.004 [3] | 230.00% |
References
- ^ Astronomy Now: 9. 2008.
{{cite journal}}:|access-date=requires|url=(help); Cite has empty unknown parameter:|coauthors=(help); Missing or empty|title=(help); Unknown parameter|month=ignored (help) - ^ "A Neptune-sized Planet in the rho1 Cancri System". The American Astronomical Soceity. 2005-04-11. Retrieved 2008-06-13.
- ^
See also
External links
- "Notes for Planet 55 Cnc f". The Extrasolar Planets Encyclopaedia. Retrieved 2008-06-13.
- Ward Glen (2007-11-08). "Astronomers Find Fifth Planet Around 55 Cancri". The Starry Mirror. Retrieved 2008-06-12.