On August 14th, the European Space Agency's (ESA) Rosetta conducted a successful trajectory correction maneuver using data obtained from the Agency's first-ever optical tracking of an asteroid target, (2867) Steins. Images from the spacecraft's cameras were used to calculate the asteroid's location and optimise its trajectory for fly-by next month. Rosetta's first major correction maneuver in the approach phase took place while the spacecraft was less than 17 million km from Steins. The spacecraft's thrusters burned continuously for approximately 2 minutes, which achieved a change in Rosetta's speed with respect to Steins of 12.8 cm/sec. This tiny change in speed, though, will be enough to correct the spacecraft's September 5th Steins fly-by distance by 250 km. Prior to this maneuver, the spacecraft's trajectory would have led it too close to the asteroid at the time of closest approach; to be compatible with spacecraft performance, Rosetta must be no closer than 800 km from Steins.