G 112-29 (=NLTT 18149), a Very Wide Companion to GJ 282 AB with a Common Proper Motion, Common Parallax, Common Radial Velocity and Common Age

TL;DR

This paper reports the discovery of a very wide physical companion to the binary GJ 282AB, confirmed through common proper motion, parallax, radial velocity, and age, making it one of the widest known binary systems.

Contribution

The study identifies and characterizes a new extremely wide companion to GJ 282AB, providing detailed astrometric and spectroscopic data to confirm its physical association.

Findings

NLTT 18149 is a very wide companion at 55733 AU from GJ 282AB.

The three stars share similar parallaxes, radial velocities, and ages.

The system is among the widest physical binary systems known.

Abstract

We have made a search for common proper motion (CPM) companions to the wide binaries in the solar vicinity. We found that the binary GJ 282AB has a very distant CPM companion (NLTT 18149) at a separation $s=1.09 \arcdeg$. Improved spectral types and radial velocities are obtained, and ages determined for the three components. The Hipparcos trigonometric parallaxes and the new radial velocities and ages turn out to be very similar for the three stars, and provide strong evidence that they form a physical system. At a projected separation of 55733AU from GJ 282AB, NLTT 18149 ranks among the widest physical companions known.