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We present high precision radial velocity observations of HD17156 during atransit of its eccentric Jovian planet. In these data, we detect theRossiter-McLaughlin effect, which is an apparent perturbation in the velocityof the star due to the progressive occultation of part of the rotating stellarphotosphere by the transiting planet. This system had previously been reportedby Narita et al. (2008) to exhibit a lambda = 62 +/- 25 degree misalignment ofthe projected planetary orbital axis and the stellar rotation axis. We modelour data, along with the Narita et al. data, and obtain lambda = 9.4 +/- 9.3degrees for the combined data set. We thus conclude that the planetary orbitalaxis is actually very well aligned with the stellar rotation axis.

The Spin-Orbit Alignment of the HD17156 Transiting Eccentric Planetary System