54 Piscium b

Planetbox begin
name = 54 Piscium bPlanetbox image


caption = An artist's impression of 54 Piscium b.Planetbox star
star = 54 Piscium A
constell = Pisces
ra = RA|00|39|21.8
dec = DEC|+21|15|01.7
dist_ly = 36.2 ± 0.3
dist_pc = 11.11 ± 0.0
class = K0VPlanetbox orbit
separation =
position_angle =
semimajor = 0.296±0.017
semimajor_no_units =
eccentricity = 0.618±0.051
period = 62.206±0.021
period_year =
inclination =
ang_dist = 25.818
long_peri = 233.3±7.4
arg_peri =
t_peri = 2,452,189.83±0.68
t_peri_no_jd =
t_transit =
t_transit_no_jd =
t_approach =
semi-amp = 16.1±1.2Planetbox character
mass = >0.227±0.023
mass_earth =
radius =
radius_earth =
density =
gravity =
gravity_earth =
temperature = ~404Planetbox discovery
discovery_date = 3 January 2003
discoverers = Butler,
Fischer, and
Marcy "et al."
discovery_method = Radial velocity
discovery_site = flag|United States
discovery_status = ConfirmedPlanetbox catalog
names = HD 3651 b

54 Piscium b, occasionally cataloged as 54 Piscium Ab in order to differentiate from the brown dwarf in the system, is an extrasolar planet [cite journal | url=http://www.journals.uchicago.edu/doi/abs/10.1086/504701|author=Butler "et al." | title=Catalog of Nearby Exoplanets | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=505 – 522 | year=2006 | doi=10.1086/504701 ( [http://xxx.lanl.gov/abs/astro-ph?papernum=0607493 web Preprint] )] cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/375027 | author=Fischer "et al." | title=A Sub-Saturn Mass Planet Orbiting HD 3651 | journal=The Astrophysical Journal | volume=590 | issue=2 | year=2003 | pages=1081 – 1087 | doi=10.1086/375027 ] approximately 36 light-years away in the constellation of Pisces. The planet was discovered orbiting the orange dwarf star 54 Piscium. The planet's minimum mass is one fifth that of Jupiter, and it orbits the star in a very eccentric orbit every two or so months.

Discovery

On January 16 2002, a team of astronomers (lead by Geoff Marcy) announced the discovery of an extrasolar planet around 54 Piscium. The planet has been estimated to have a mass of only 20 percent that of Jupiter (making the planet around the same size and mass of Saturn).

Physical characteristics

The planet orbits its sun at a distance of 0.28 astronomical units (which would be within the orbit of Mercury), which takes approximately 62 days to complete. The planet has a high eccentricity of about 0.63. The highly elliptical orbit, however, suggested that the gravity of an unseen object farther away from the star was pulling the planet outward. The eccentric orbit became clear with the discovery of the brown dwarf within the system.

It has calculated that the orbit of an Earth-like planet would need to be centered within 0.68 astronomical units (around the orbital distance Venus), taking around 240 days to complete. However, the inner planet's eccentric orbit would probably disturb the orbit of such an Earth-type planet.

See also

* 109 Piscium b

References

External links

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