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We present the results of a recent reverberation-mapping campaign undertakento improve measurements of the radius of the broad line region and the centralblack hole mass of the quasar PG 2130+099. Cross correlation of the 5100angstrom continuum and H-beta emission-line light curves yields a time lag of22.9 (+4.4 - 4.3) days, corresponding to a central black hole mass MBH= 3.8(+/- 1.5) x 10^7 Msun. This value supports the notion that previousmeasurements yielded an incorrect lag. We re-analyzed previous datasets toinvestigate the possible sources of the discrepancy and conclude that previousmeasurement errors were apparently caused by a combination of undersampling ofthe light curves and long-term secular changes in the H-beta emission-lineequivalent width. With our new measurements, PG 2130+099 is no longer anoutlier in either the R-L or the MBH-Sigma relationships.

The Mass of the Black Hole in the Quasar PG 2130+099