NAME GJ 644/643 system

Object query : NAME GJ 644/643 system C.D.S. - SIMBAD4 rel 1.223 - 2014.12.19CET16:51:21

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
NAME GJ 644/643 system -- Composite object
Other object types: mul () , ** (PMSC)
ICRS coord. (ep=J2000) : 16 55 32.0 -08 21 30 ( ~ ) [ ~ ~ ~ ] D 1984PASP...96..439H
FK5 coord. (ep=J2000 eq=2000) : 16 55 32.0 -08 21 30 ( ~ ) [ ~ ~ ~ ] D 1984PASP...96..439H
FK4 coord. (ep=B1950 eq=1950) : 16 52 48.8 -08 16 46 ( ~ ) [ ~ ~ ~ ] D 1984PASP...96..439H
Gal coord. (ep=J2000) : 011.0328 +21.1179 ( ~ ) [ ~ ~ ~ ] D 1984PASP...96..439H
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within radius arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).

essential notes:

  • Represents the quintuple system Wolf 629/630 composed of 2 binaries: the short period (1.7yr) astrometric binary Wolf 630, the spectroscopic binary Wolf 629 (Gliese 643) at  80'' ( 500AU), and the low-luminosity star VB 8 at  230'' ( 1500AU).


Hierarchy : number of linked objects whatever the membership probability is (see description here ) :

: 3 Display criteria :

Identifiers (2) :

NAME GJ 644/643 system PMSC 16501-0809

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References (3 between 1850 and 2015)
Simbad bibliographic survey began in 1950 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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2014.12.19-16:51:21

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