Interferometric, spectroscopic, astrometric, and photometric observations are presented for the nearby solar-type binary HR 6697. The system consists of a G0-2 V primary and a K2-S V secondary. From a combined solution of the speckle and spectroscopic data the orbital period is 881 days or 2.41 yr, the semimajor axis is 2.1 A.U., the eccentricity is 0.42, and the inclination is 68°. The masses and luminosities are 1.16±0.12 Msun, 0.77±0.05 Msun, 1.61±0.15 Lsun, and 0.17±0.05 Lsun. Two independent determinations of the parallax, a trigonometric parallax of 0".0379±0".0030, and an orbital parallax of 0".0375±0".0014, are in excellent agreement and give a mean distance of 26.6±0.9 pc. The system appears to be metal rich relative to the Sun, and space motions do not identify it with any moving group.
McAlister, H.A.; Hartkopf, W.I.; Mason, B.D.; Fekel, F.C.; Ianna, P.A.; Tokovinin, A.A.; Griffin, R.F.; Culver, R.B. "Binary Star Orbits from Speckle Interferometry. VI. The Nearby Solar-Type Speckle-Spectroscopic Binary HR 6697" Astronomical Journal v.110, p.366 (1995)