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We report the discovery of a new slowly pulsating B (SPB) star, with thelargest number of detected frequencies to date by more than a factor of three,based on 37 days of MOST (Microvariability & Oscillations of STars) satelliteguide star photometry. The star HD 163830 (V = 9.3, B5II/III) varies in twentydetected frequencies in the range $0.035 - 1.06$ d$^{-1}$ ($0.4 - 12.3 ~\mu$Hz) with amplitudes from 0.7 to 7.6 mmag ($S/N$ from {4 to 43}). Eighteenof these frequencies are consistent with low-degree, high-order nonradialg-modes {of seismic models of an evolved 4.5$M_{\odot}$ star. We are unable toidentify one unique model due to lack of mode identifications. The lowest twofrequencies may be associated with the rotation of HD 163830, but firm proof ofthis must await future spectroscopic data.Comment: 4 pages, 3 figures, accepted for publication in The Astrophysical  Journal Letter

Discovery of the New Slowly Pulsating B Star HD 163830 (B5 II/III) from MOST Space-based Photometry