HD 196885

HD 196885 is a 6th magnitude star in the constellation Delphinus. This star is a binary. According to its parallax of 29.15 milliarcseconds, [cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=101615|title=HIP 101966|author=van Leeuwen, F.|work=Hipparcos, the New Reduction|year=2007|accessdate=2008-08-19] it is located at a distance of 112 light years from Earth. In 2004, a planet was announced to be orbiting the star in a 386-day orbit. [cite web|url=http://web.archive.org/web/20041227061730/http://exoplanets.org/esp/hd196885/hd196885.shtml|title=The Planet Around HD 196885|publisher=California & Carnegie Planet Search Team (Internet Archive link)|accessdate=2008-08-19] Follow-up work published in 2008 did not confirm the original candidate but instead found evidence of a planet in a 1349-day orbit.cite journal|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...479..271C&db_key=AST&nosetcookie=1|title=The ELODIE survey for northern extra-solar planets. IV. HD 196885, a close binary star with a 3.7-year planet|author=Correia, A. C. M.; Udry, S.; Mayor, M.; Eggenberger, A.; Naef, D.; Beuzit, J.-L.; Perrier, C.; Queloz, D.; Sivan, J.-P.; Pepe, F.; Santos, N. C.; Ségransan, D.|year=2008|journal=Astronomy and Astrophysics|volume=479|issue=1|pages=271 – 275|doi=10.1051/0004-6361:20078908|accessdate=2008-08-19]

The star BD+10 4351B, located 192 arcseconds away from HD 196885 is located at the same distance and may be a physically-bound companion star, in which case HD 196885 is a triple system.cite web|url=http://obswww.unige.ch/exoplanets/hd196885A.html|title=HD 196885 A page|publisher=Geneva Observatory|accessdate=2008-08-19] If it is bound, then the separation is at least 6600 AU (the separation along the line-of-sight is unknown, so this value represents a lower limit on the true separation).

HD 196885 A

Starbox short
name=HD 196885 A
epoch=2000
constell=Delphinus
ra=20^h 39^m 51^s
dec=+11° 14' 58"
spectral=F8IV
appmag_v=6.39
dist_ly=112
dist_pc=34.3
names=HR 7907, SAO 106360, BD +10 4351, WDS 20399+1115

HD 196885 A is an F6IV star. It has a mass of 1.33 solar masses and a radius of 1.79 times that of our Sun.cite web|url=http://exoplanet.eu/star.php?st=HD+196885|title=Notes for star HD 196885|work=The Extrasolar Planets Encyclopaedia|author=Schneider, J.|accessdate=2008-08-19]

HD 196885 Ab

Planetbox begin
name=HD 196885 AbPlanetbox orbit
semimajor=2.30
eccentricity=0.462
period=1349
long_peri=91.4
t_peri=2451236
semi-amp=39.5Planetbox character
mass=>2.96Planetbox discovery
discoverers=Marcy et al.
discovery_date=2005
discovery_status=Published

HD 196885 Ab (also referred to as HD 196885 b) is a jovian planet with at least 2.96 times the mass of Jupiter.

HD 196885 B

Starbox short
name=HD 196885 B
epoch=2000
constell=Delphinus
ra=20^h 39^m 51^s
dec=+11° 14' 58"
spectral=M1V
dist_ly=112
dist_pc=34.3

HD 196885 B is a red dwarf star separated by 0.7 arcseconds from the primary star. At a distance of 112 light years, this corresponds to a separation of 24 AU between the stars. [Cite journal | url=http://www.aanda.org/articles/aa/abs/2007/44/aa7046-06/aa7046-06.html | title=Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442 | author=Chauvin "et al." | journal=Astronomy and Astrophysics | year=2007 | volume=475 | issue=2 | page=723-727 | doi=10.1051/0004-6361:20067046 | format=abstract ( [http://arxiv.org/abs/0710.5918 web preprint] )] Since the separation along the line-of-sight is unknown, this represents a lower limit on the true separation.

ee also

*Epsilon Reticuli
*GJ 3021

References