AB Pictoris

AB Pictoris

Starbox begin
name = AB Pictoris
Starbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Pictor
ra = RA|06|19|12.9135SIMBAD link|AB+Pic|V* AB Pic -- Variable Star, database entry, SIMBAD. Accessed on line October 3, 2008.] | dec = DEC|−58|03|15.522
Starbox character
class = K2V
b-v = 0.8
variable = BY:AB Pic, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 3, 2008.]
Starbox astrometry
radial_v = 22.2 ± 0.3
prop_mo_ra = 14.13
prop_mo_dec = 45.21
parallax = 21.97
p_error = 0.82
parallax_footnote =
absmag_v= 5.87 [From apparent magnitude and parallax.]
Starbox detail
rotational_velocity = 12 [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/117/table1.dat&recno=4238 HD 44627] , database entry, The Geneva-Copenhagen survey of the Solar neighbourhood, Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs, B. Nordstrom et al., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/117 V/117] . Accessed on line October 3, 2008.]
temperature = 4900
metal = [Fe/H] = −0.64
Starbox catalog
names=AB Pic, CD−58 1409, CPD−58 670, HD 44627A, HD 44627, HIP 30034, PPM 335089, SAO 234448.
Starbox reference

AB Pictoris, also catalogued as HD 44627, is a K-type star, approximately 148 light-years away in the constellation of Pictor. It has been identified as a member of the young (30 million years old) Tucana/Horologium association. [New Members of the TW Hydrae Association, β Pictoris Moving Group, and Tucana/Horologium Association, Inseok Song, B. Zuckerman, and M. S. Bessell, "The Astrophysical Journal" 599, #1 (December 2003), pp. 342–350, bibcode|2003ApJ...599..342S, doi|10.1086/379194.] The star has also been classified as a BY Draconis variable. In 2005, it was announced that in 2003 and 2004, an astronomical object had been imaged close to the star, apparently in orbit around it. Its mass suggests that it is an extrasolar planet, but the object may in fact be a brown dwarf.

Possible planetary system

In 2003 and 2004, an object (now cataloged as "AB Pictoris b") was observed close to the star by a team of astronomers at the European Southern Observatory. Since it had common proper motion with AB Pictoris, it was concluded that it was physically close to the star. Its spectral type was estimated as between L0V and L3V. Using evolutionary models, its mass was estimated as from 13 to 14 Jupiter masses.A companion to AB Pic at the planet/brown dwarf boundary, G. Chauvin, A.-M. Lagrange, B. Zuckerman, C. Dumas, D. Mouillet, I. Song, J.-L. Beuzit, P. Lowrance, and M. S. Bessell, "Astronomy and Astrophysics" 438, #3 (August 2005), pp. L29–L32, bibcode|2005A&A...438L..29C, doi|10.1051/0004-6361:200500111, arXiv|astro-ph/0504658.] However, because modelling such young objects is difficult, this estimate is very uncertain; some models give masses as low as 11 Jupiter masses or as high as 70 Jupiter masses. Temperature estimates range from 1600 K to 2400 K. [Homogeneous comparison of directly detected planet candidates: GQ Lup, 2M1207, AB Pic, Ralph Neuhaeuser, "ESO Workshop Proceedings on Multiple Stars", bibcode|2005astro.ph..9906N, arXiv|astro-ph/0509906.] As it is not known if the mass of the object exceeds the deuterium-burning limit of 13 Jupiter masses, it is not clear whether the object should be classified as an extrasolar planet or a brown dwarf.

exoplanet = b
separation = 275 [http://exoplanet.eu/planet.php?p1=AB+Pic&p2=b Planet : AB Pic b] , "Extrasolar Planets Encyclopedia". Accessed on line October 3, 2008.]
mass = 13.5 ± 0.5
year = 2005

See also

* 51 Pegasi
* Beta Pictoris
* GQ Lupi


External links

** [http://exoplanet.eu/planet.php?p1=AB+Pic&p2=b Notes for planet AB Pic b]

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