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LP 209-28 and LP 209-27 have similar proper motions as tabulated by severalcatalogues. Using seven astrometric epochs spanning 59 years, we confirm acommon tangential velocity by measuring a constant angular separation of rho =666.62+/-0.09 arcsec. Accurate SDSS and 2MASS photometry indicates that theyare normal dwarfs of approximate spectral types K7 V and M3 V. However, fromtheir apparent magnitudes, both LP 209-28 and LP 209-27 are located at 200-250pc, from where one can deduce an astonishing projected physical separation of0.6-0.8 pc. The system Koenigstuhl 6 AB represents another world record amongthe least-bound systems with low-mass star components.

Cool dwarfs in wide multiple systems. Paper 3: Two common-proper-motion, late-type stars separated by over 11 arcmin