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We present the spectroscopic orbit of LHS 1610A, a newly discoveredsingle-lined spectroscopic binary with a trigonometric distance placing it at9.9 pm 0.2 pc. We obtained spectra with the TRES instrument on the 1.5mTillinghast Reflector at the Fred Lawrence Whipple Observatory located on Mt.Hopkins in AZ. We demonstrate the use of the TiO molecular bands at 7065 --7165 Angstroms to measure radial velocities and achieve an average estimatedvelocity uncertainty of 28 m/s. We measure the orbital period to be 10.6 daysand calculate a minimum mass of 44.8 pm 3.2 Jupiter masses for the secondary,indicating that it is likely a brown dwarf. We place an upper limit to 3 sigmaof 2500 K on the effective temperature of the companion from infraredspectroscopic observations using IGRINS on the 4.3m Discovery ChannelTelescope. In addition, we present a new photometric rotation period of 84.3days for the primary star using data from the MEarth-South Observatory, withwhich we show that the system does not eclipse.

LHS 1610A: A Nearby Mid-M Dwarf with a Companion That is Likely A Brown Dwarf