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We present the results of a reverberation-mapping program targeting NGC5273,a nearby early-type galaxy with a broad-lined active galactic nucleus. Over thecourse of the monitoring program, NGC5273 showed strong variability thatallowed us to measure time delays in the responses of the broad opticalrecombination lines to changes in the continuum flux. A weighted average ofthese measurements results in a black hole mass determination of $M_{\rm BH} =(4.7 \pm 1.6) \times 10^6$ M$_{\odot}$. An estimate of the size of the blackhole sphere of influence in NGC5273 puts it just at the limit of the resolutionachievable with current ground-based large aperture telescopes. NGC5273 istherefore an important future target for a black hole mass determination fromstellar dynamical modeling, especially because it is the only nearby early-typegalaxy hosting an AGN with a reverberation-based mass, allowing the bestcomparison for the masses determined from these two techniques.

The Mass of the Central Black Hole in the Nearby Seyfert Galaxy NGC5273