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In 2010 May 23-24, SDO observed the launch of two successive coronal massejections (CMEs), which were subsequently tracked by the SECCHI suite onboardSTEREO. Using the COR2 coronagraphs and the heliospheric imagers (HIs), theinitial direction of both CMEs is determined to be slightly west of theSun-Earth line. We derive the CME kinematics, including the evolution of theCME expansion until 0.4 AU. We find that, during the interaction, the secondCME decelerates from a speed above 500 km/s to 380 km/s the speed of theleading edge of the first CME. STEREO observes a complex structure composed oftwo different bright tracks in HI2-A but only one bright track in HI2-B. Insitu measurements from Wind show an "isolated" ICME, with the geometry of aflux rope preceded by a shock. Measurements in the sheath are consistent withdraping around the transient. By combining remote-sensing and in situmeasurements, we determine that this event shows a clear instance of deflectionof two CMEs after their collision, and we estimate the deflection of the firstCME to be about 10 degrees towards the Sun-Earth line. The arrival time,arrival speed and radius at Earth of the first CME are best predicted fromremote-sensing observations taken before the collision of the CMEs. Due to theover-expansion of the CME after the collision, there are few, if any, signs ofinteraction in in situ measurements. This study illustrates that complexinteractions during the Sun-to-Earth propagation may not be revealed by in situmeasurements alone.

The Deflection of the Two Interacting Coronal Mass Ejections of 2010 May 23-24 as Revealed by Combined In situ Measurements and Heliospheric Imaging