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The 2MASS Wide-Field T Dwarf Search. II. Discovery of Three T Dwarfs in the Southern Hemisphere
We present the discovery of three new southern hemisphere T dwarfsidentified in the Two Micron All Sky Survey. These objects, 2MASS0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310, have classificationsT7, T5.5, and T6.5, respectively. Using linear absolutemagnitude/spectral type relations derived from T dwarfs with measuredparallaxes, we estimate spectrophotometric distances for thesediscoveries; the closest, 2MASS 0348-6022, is likely within 10 pc of theSun. Proper motions and estimated tangential velocities are consistentwith membership in the Galactic disk population. We also list southernhemisphere T dwarf candidates that were either not found in subsequentnear-infrared imaging observations and are most likely uncataloged minorplanets, or have near-infrared spectra consistent with background stars.

Four-colour and H BET photometry of some bright southern stars- II.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.160..155S&db_key=AST

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Dades d'Observació i Astrometria

Constel·lació:Octans
Ascensió Recta:21h33m20.60s
Declinació:-80°02'21.0"
Magnitud Aparent:6.47
Distancia:110.497 parsecs
Moviment propi RA:23
Moviment propi Dec:-22.8
B-T magnitude:6.519
V-T magnitude:6.471

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 203955
TYCHO-2 2000TYC 9482-928-1
USNO-A2.0USNO-A2 0075-06815392
BSC 1991HR 8201
HIPHIP 106424

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