109 Piscium b

Planetbox begin
name=109 Piscium b [ 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] ) ] Planetbox orbit
semimajor=2.16±0.12
period=1076.4±2.4
eccentricity=0.1023±0.0096
ang_dist=65.418
long_peri=108.9±8.2
t_peri=2,450,396±29
semi-amp=115±1.5Planetbox character
mass=>6.38±0.53Planetbox discovery
discovery_date=November 14, 1999
discovery_site=Keck Observatory
discoverers=Vogt et al.
discovery_method=Radial velocity
discovery_status=Published

109 Piscium b (aka HD 10697 b) is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is at least 6.38 times the mass of Jupiter and is likely to be a gas giant. As typical for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.

The discoverers estimate its effective temperature as 264 K from solar heating, but it could be at least 10-20 K warmer because of internal heating [ cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/308981 | author=Vogt "et al." | title=Six New Planets from the Keck Precision Velocity Survey | journal=The Astrophysical Journal | year=2000 | volume=536 | issue=2 | pages=902 – 914 | doi=10.1086/308981 ] .

Preliminary astrometric measurements suggested that the orbital inclination is 170.3° [cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/318927 | author=Han "et al." | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The Astrophysical Journal | volume=548| issue=1 | pages=L57 – L60 | year=2001 | doi=10.1086/318927 ] , yielding an object mass of 38 times that of Jupiter, which would make it a brown dwarf. However, subsequent analysis indicates that the precision of the measurements used to derive the astrometric orbit is insufficient to constrain the parameters, so the true inclination and mass remain unknown. [cite journal|url=http://adsabs.harvard.edu/abs/2001A%26A...372..935P|title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects|author=Pourbaix, D. and Arenou, F.|journal=Astronomy and Astrophysics|volume=372|pages=935 – 944|year=2001|doi=10.1051/0004-6361:20010597]

ee also

*109 Piscium
*54 Piscium b

References

External links

*cite web|url=http://voparis-exoplanet.obspm.fr/star.php?st=HD+10697&p2=b|work=The Extrasolar Planets Encyclopaedia|title=The Extrasolar Planets Encyclopaedia: HD 10697 b|accessdate=26 August|accessyear=2008