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We present ultraviolet and optical spectra of the first bright spot (PA = 29degrees) on Supernova 1987A's equatorial circumstellar ring taken with theSpace Telescope Imaging Spectrograph. We interpret this spot as the emissionproduced by radiative shocks that occur where the supernova blast wave strikesan inward protrusion of the ring. The observed line widths and intensity ratiosindicate the presence of radiative shocks with velocities ranging from 100 to250 km s^-1 entering dense (> 10^4 cm^-3) gas. These observations, and futureobservations of the development of the spectra and line profiles, provide aunique opportunity to study the hydrodynamics of radiative shocks.Comment: Accepted by ApJL on Aug. 3, 200

[ITAL]Hubble Space Telescope[/ITAL] Spectroscopy of Spot 1 on the Circumstellar Ring of SN 1987A