The young nearby solar-type star HD 91962 is a rare quadruple system where three companions revolve around the main component with periods of 170.3 days , 8.84 years , and 205 years .
The two outer orbits are nearly co-planar , and all orbits have small eccentricities .
We refine the visual orbit of the outer pair , determine the combined spectro-interferometric orbit of the middle 8.8-yr pair and the spectroscopic orbit of the inner binary .
The middle and inner orbits are likely locked in a 1:19 resonance , the ratio of the outer and middle periods is \sim 23 .
The masses of all components are estimated ( inside-out : 1.14 , 0.32 , 0.64 , 0.64 solar mass ) , the dynamical parallax is 27.4 \pm 0.6 mas .
We speculate that this multiple system originated from collapse of an isolated core and that the secondary components migrated in a dissipative disk .
Other multiple systems with similar features ( coplanarity , small eccentricity , and period ratio around 20 ) are known .