HD 217107 b and Talk:Robakowo, Kuyavian-Pomeranian Voivodeship: Difference between pages
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{{WikiProject Poland|class=stub|importance=low}} |
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{{Planetbox begin |
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| name = HD 217107 b |
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}} |
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{{Planetbox star |
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| star = [[HD 217107]] |
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| constell = [[Pisces (constellation)|Pisces]] |
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| ra = {{RA|22|58|15.54}} |
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| dec = {{DEC|−2|23|43.39}} |
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| dist_ly = 64.3 ± 1 |
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| dist_pc = 19.7 ± 0.3 |
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| class = G8IV |
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}} |
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{{Planetbox orbit |
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| separation = <!--observed separation, in astronomical units (AU)--> |
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| position_angle = <!--position angle, in degrees--> |
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| semimajor = 0.074 ± 0.002 |
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| eccentricity = 0.13 ± 0.02 |
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| period = 7.1269 ± 0.00022 |
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| inclination = <!--orbital inclination, in degrees--> |
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| ang_dist = 1.973 |
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| long_peri = 21.1 |
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| arg_peri = <!--argument of periastron, in degrees--> |
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| t_peri = 2,449,998.4241 ± 0.17 |
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| t_transit = <!--time of transit (Julian date, JD; can use t_transit_no_jd instead))--> |
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| t_approach = <!--time of closest approach (Julian date, JD)--> |
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| semi-amp = 140.7 ± 2.6 |
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}} |
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{{Planetbox character |
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| mass = >1.37 ± 0.14 |
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| radius = <!--radius in multiples of Jupiter's radius (optional, can use radius_earth instead)--> |
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| density = <!--average density--> |
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| gravity = <!--surface gravity in m/s²--> |
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| temperature = ~1013 |
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}} |
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{{Planetbox discovery |
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| discovery_date = [[24 November]] [[1998]] |
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| discoverers = [[Geoffrey Marcy|Marcy]] ''et al.'' |
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| discovery_method = [[Doppler spectroscopy]] |
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| discovery_site = {{flag|United States}} |
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| discovery_status = Confirmed |
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}} |
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{{Planetbox end}} |
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'''HD 217107 b''' is an [[extrasolar planet]] |
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<ref name=Vogt>{{cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/432901 | author=Vogt ''et al.'' | title=Five New Multicomponent Planetary Systems| journal=The [[Astrophysical Journal]]| year=2005 | volume=632 | issue=1 | pages=638 – 658 | doi=10.1086/432901}}</ref> approximately 46 [[light-year]]s away in the [[constellation]] of [[Pisces (constellation)|Pisces]] (the [[Fish]]). The planet was discovered orbiting the star [[HD 217107]] approximately every seven [[day]]s, classifying the planet as a [[hot Jupiter]]. Because of the planet's somewhat [[Orbital eccentricity|eccentric]] orbit, scientists were able to confirm another planet within the system ([[HD 217107 c]]). |
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== Discovery == |
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As with the majority of extrasolar planet discoveries so far, it was found by detecting small variations in the [[radial velocity]] of the star it orbits, caused by the tug of its [[gravity]]. |
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A study of the radial velocity of HD 217107 carried out in 1998 revealed that its motion along the line of sight varied over a 7.1 day cycle. The period and amplitude of this variation indicated that it was caused by a [[planet]]ary companion in orbit around the star, with a minimum mass slightly greater than that of [[Jupiter]].<ref>{{cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/316304 | author=Fischer ''et al.'' | title=Planetary Companions around Two Solar-Type Stars: HD 195019 and HD 217107 | journal=[[Publications of the Astronomical Society of the Pacific]] | year=1999 | volume=111 | issue=755 | pages=50 – 56 | doi=10.1086/316304}}</ref> The planet's mean distance from the star is less than one fifth of [[Mercury (planet)|Mercury's]] distance from the [[Sun]]. |
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=== Indication of second planet === |
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While most planets with orbital periods of less than 10 days have almost circular orbits, HD 217107 b has a somewhat [[eccentricity (orbit)|eccentric]] orbit, and its discoverers hypothesised that this could be due to the gravitational influence of a second planet in the system at a distance of several [[astronomical unit]]s (AU).<ref>{{cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/320224 | author=Fischer ''et al.'' | title=Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets | journal=The [[Astrophysical Journal]] | year=2002 | volume=551 | issue=2 | pages=1107 – 1118 | doi=10.1086/320224}}</ref> Confirmation of the existence of a second planet, [[HD 217107 c]], followed in 2005. |
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== See also == |
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* [[HD 217107 c]] |
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== References == |
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{{reflist}} |
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== External links == |
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* {{cite web |url=http://www.extrasolar.net/planettour.asp?StarCatId=&PlanetId=12 |title=HD 217107 b |accessdate=2008-06-23 |work=Extrasolar Visions}} |
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* {{cite web |url=http://www.solstation.com/stars2/hr8734.htm |title=HD 217107 / HR 8734 |accessdate=2008-06-23 |work=SolStation}} |
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* {{cite web |url=http://exoplanet.eu/planet.php?p1=HD+217107&p2=b |title=Notes for planet HD 217107 b |accessdate=2008-06-23 |work=The Extrasolar Planets Encyclopaedia}} |
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[[Category:Extrasolar planets]] |
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[[Category:Pisces constellation]] |
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[[Category:Hot Jupiters|217107 c]] |
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[[Category:Exoplanets discovered in 1998]] |
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[[Category:Gas giant planets]] |
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Kayle Huston added this Mercury's distance from the sun is 58,000,000km [about 36,000,000mi]. |
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Revision as of 01:28, 13 October 2008
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