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Context: In 2004 asteroid (2867) Steins has been selected as a flyby targetfor the Rosetta mission. Determination of its spin period and the orientationof its rotation axis are essential for optimization of the flyby planning. Aim:Measurement of the rotation period and light curve of asteroid (2867) Steins ata phase angle larger than achievable from ground based observations, providinga high quality data set to contribute to the determination of the orientationof the spin axis and of the pole direction. Methods: On March 11, 2006,asteroid (2867) Steins was observed continuously for 24 hours with thescientific camera system OSIRIS onboard Rosetta. The phase angle was 41.7degrees, larger than the maximum phase angle of 30 degrees when Steins isobserved from Earth. A total of 238 images, covering four rotation periodswithout interruption, were acquired. Results: The light curve of (2867) Steinsis double peaked with an amplitude of $\approx$ 0.23 mag. The rotation periodis 6.052 $\pm$ 0.007 hours. The continuous observations over four rotationperiods exclude the possibility of period ambiguities. There is no indicationof deviation from a principal axis rotation state. Assuming a slope parameterof G = 0.15, the absolute visual magnitude of Steins is 13.05 $\pm$ 0.03.

Determination of the light curve of the Rosetta target asteroid (2867) Steins by the OSIRIS cameras onboard Rosetta