The planet of 51 Pegasi with STELLA-I/SES. The orbital period of the planet is 4.23 days (; continuous line) and the velocity amplitude is 100 m/s. Our overall rms of the data is 30 m/s, an individual measurement error is 70 m/s. The data span between May and August in 2008 and are plotted directly from the SES pipeline. Note that no other measures than the thermal and mechanical stabilization of the spectrograph were taken.
