HD 74156 d

Planetbox begin
name=HD 74156 dPlanetbox star
star = HD 74156
constell = Hydra
RA = RA|08|42|25.1222
DEC = DEC|+04|34|41.151
dist_ly = 210.6
dist_pc = 64.56
class = G0VPlanetbox orbit
semimajor=1.01
eccentricity=0.25±0.11
period=336.6±3.6
ang_dist=16
long_peri=166.5±27.4
t_peri=2,450,678.2±44.2
semi-amp=29.8Planetbox character
mass=>0.396±0.02
radius = ~0.867
insolation = 3964
insolation_earth = 2.90
temperature = ~334Planetbox discovery
discovery_date=Sept 11, 2007
discovery_method=Radial velocity
discovery_site=Texas
discoverers=Bean et al.
discovery_status=PublishedPlanetbox catalog
names = HIP 42723 d, SAO 117040 d

HD 74156 d is a proposed exoplanet with minimum mass 40% the mass of Jupiter. If the orbital inclination is not wholly face-on to Earth, then it would be a gas giant. It orbits about the same distance as Earth to the Sun, too hot for the system's habitable zone. It was first observed by Jacob Bean and his team at the University of Texas.

The existence of HD 74156 d was predicted by computer models created by Rory Barnes, Thomas Quinn and Sean Raymond, operating under the theory that planetary systems would have planets occupying every stable orbital zone. The two previously discovered planets of this system left a stable gap between them where HD 74156 d was ultimately claimed detected. If this holds out, it is the first extrasolar planet whose existence was predicted by theory before it was detected experimentally. [ [http://www.centauri-dreams.org/?p=1673 Centauri Dreams » Blog Archive » Exoplanet Prediction Confirmed ] ]

Roman V. Baluev cast doubt on this discovery due to errors in the data. [cite arXiv | title=Accounting for velocity jitters in planet search surveys |author=Roman V. Baluev |class=astro-ph |eprint=0712.3862v2 |year=2008] The initial discoverers have not yet addressed Baluev's concern. [cite arXiv | title=The Successful Prediction of the Extrasolar Planet HD 74156 d | author=Rory Barnes, Krzysztof Gozdziewski, Sean N. Raymond |class=astro-ph |eprint=0804.4496v1 |year=2008]

See also

* HD 74156 b
* HD 74156 c

References

* cite journal |url=http://fr.arxiv.org/abs/0709.1656 |author= Jacob L. Bean, Barbara E. McArthur, G. Fritz Benedict, Amber Armstrong
title=Detection of a Third Planet in the HD 74156 System Using the Hobby-Eberly Telescope |journal=Astronomy and Astrophysics |year=2007
format=abstract

External links

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