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We report the first asteroseismic results obtained with the Hertzsprung SONGTelescope from an extensive high-precision radial-velocity observing campaignof the subgiant muHerculis. The data set was collected during 215 nights in2014 and 2015. We detected a total of 49 oscillation modes with l values from 0to 3, including some l = 1 mixed modes. Based on the rotational splittingobserved in l = 1 modes, we determine a rotational period of 52 days and astellar inclination angle of 63 degrees. The parameters obtained throughmodeling of the observed oscillation frequencies agree very well withindependent observations and imply a stellar mass between 1.11 and 1.15M_sunand an age of 7.8+/-0.4 Gyr. Furthermore, the high-quality data allowed us todetermine the acoustic depths of the He II ionization layer and the base of theconvection zone.

First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {\Mu}Her