 A number of claims have been made for the discovery by astrometry of one or more extrasolar planets in the Lalande 21185 system, but these are now in doubt.In Larry Niven's "Known Space" stories, Luyten's Star is Down's primary (known as "L5 1668", almost certainly a corrupted form of the BD+05°1668 designation).In Michael McCollum's Antares series, Luyten's Star is the destination of the first foldpoint transition from Sol.