Astrometric companion

from Astrometric and Radial Velocity Data”, PASP 114, 224. Han, I. and Gatewood, G. 2002, “An Upper Limit to the Mass of the Radial Velocity Companion of

SIMBAD. Accessed on line June 13, 2008. Astrometric and photometric monitoring of GQ Lupi and its sub-stellar companion, Ralph Neuhaeuser, Markus Mugrauer

（111 pc）。這是只有一組光譜線的光譜聯星系統，這意味著式望遠鏡不能解析成為兩顆獨立的恆星，但是看不見的天體測量伴星（英语：Astrometric companion）受到的引力攝動，可以通過都卜勒效應引起的恆星光譜移位來辨別。這一對以675天的的軌道週期繞著彼此的質量中心運行，離心率為0.57

b描述为“环绕一颗年轻恒星运行的行星级质量的伴星”。 2M1207b Astrometric and photometric monitoring of GQ Lupi and its sub-stellar companion, Ralph Neuhäuser, Markus Mugrauer,

Ragazzoni, R.; MacChetto, D. First HST/FOC images of the low mass companion of the astrometric binary Gliese 623. Astronomy and Astrophysics. November 1996