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HD 45159


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The first wide ultracool binary dwarf in the field: DENIS-J055146.0-443412.2 (M8.5 + L0)
We present observations of a new very low mass field binary, discoveredduring an infrared imaging survey of 250 DENIS L and very late-M dwarfs.DENIS-J055146.0-443412.2 is an M8.5 + L0 pair, with a physicalseparation of over 200 AU. This makes it the widest very low mass binaryknown in the field, by an order of magnitude. Such a system is fragile,and it would not have survived a close encounter with a third body. Itsexistence demonstrate that some very low mass stars/brown dwarfs formwithout ejection from a multiple system, or any other strong dynamicalinteraction.

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Observation and Astrometry data

Constellation:とも座
Right ascension:06h23m13.73s
Declination:-48°34'10.9"
Apparent magnitude:8.498
Distance:141.643 parsecs
Proper motion RA:11.8
Proper motion Dec:58.3
B-T magnitude:9.081
V-T magnitude:8.547

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 45159
TYCHO-2 2000TYC 8107-1781-1
USNO-A2.0USNO-A2 0375-02494085
HIPHIP 30374

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