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Revision as of 03:06, 21 July 2008 editGabrielVelasquez (talk | contribs)2,704 edits →Characteristics: undoing vandism by nuclearvacuum← Previous edit Revision as of 03:39, 21 July 2008 edit undoGabrielVelasquez (talk | contribs)2,704 edits →Characteristics: Insolation recieved by 55 Cancri fNext edit →
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== Characteristics == == Characteristics ==


Since the planet was detected indirectly through observations of its star, properties such as its ], composition and ] are unknown. With a mass similar to that of Saturn, 55 Cancri f is likely to be a ] with no solid surface. Orbiting in 55 Cancri A's ], ] could exist on the surface of a moon. Since the planet was detected indirectly through observations of its star, properties such as its ], composition and ] are unknown. With a mass similar to that of ], 55 Cancri f is likely to be a ] with no solid surface. Orbiting through 55 Cancri A's so-called "]," but receiving more ] than ] at ], ] is not likey to exist on any moons it might have.


=== Insolation recieved by 55 Cancri f ===
''Main articles: ] & ]''
{| class="wikitable" {| class="wikitable"
|- align="center" style="align:center; background:#ffc0c0" |- align="center" style="align:center; background:#ffc0c0"
Line 55: Line 57:
! ] (W/m<sup>2</sup>) ! ] (W/m<sup>2</sup>)
! % of Earth's ! % of Earth's

⚫ |-

⚫ | '''55 Cnc f''' Apastron Flux ||380.136|| 27.74%
|- |-
| Mars' Aphelion Flux || 494.00||36.06% | Mars' Aphelion Flux || 494.00||36.06%
⚫ |-
| '''55 Cnc f''' Average Flux ||547.395|| 39.99%
|- |-
| Mars' Average Flux ||590.589 ||43.11% | Mars' Average Flux ||590.589 ||43.11%
Line 66: Line 66:
| Mars' Perihelion Flux ||718.545 ||52.45% | Mars' Perihelion Flux ||718.545 ||52.45%
|- |-
| '''55 Cnc f''' Periastron Flux ||855.305 || 62.43% | Earth's Aphelion Flux ||1325.277 || 93.74%
|- |-
| Earth's Aphelion Flux ||1325.277 || 93.74% | Earth's Average Flux ||1366.078 || 100.00%
|- |-
| Earth's Average Flux ||1369.938 || 100.00% | '''55 Cancri f''' Apastron Flux || '''1396.446''' || '''102.22%'''
|- |-
| Earth's Perihelion Flux ||1416.896|| 103.43% | 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' 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%
|} |-
| '''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%'''


⚫ |-
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>
|}


== References == == References ==

Revision as of 03:39, 21 July 2008

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55 Cancri f, also cataloged as Rho 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.

Discovery

The initial presentation of this planet occurred at a meeting of the American Astronomical Society in April 2005, 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/m) % of Earth's


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 3142.004 230.00%

References

  1. 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)
  2. "A Neptune-sized Planet in the rho Cancri System". The American Astronomical Soceity. 2005-04-11. Retrieved 2008-06-13.
  3. f p = ( ( 1.15 × 6.955 × 10 8 ) 2 ) × ( 5.67051 × 10 − 8 ) × ( 5243 4 ) ( ( 0.781 − ( 0.781 × 0.2 ) ) × 149597876600 ) 2 {\displaystyle 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}}}}

See also

External links

Categories: