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Context. The object 2012 DA14 is a near-Earth asteroid with a size of severaltens of meters. It had approached closely the Earth on 15 February, 2013 UT,providing an opportunity for precise measurements of this tiny asteroid. Aims.The solar phase angle of 2012 DA14 had varied widely around its closestapproach but was almost constant during the following night. We performedtime-series photometric observations on those two nights to determine therotational properties and phase effect. Methods. The observations were carriedout using the 0.55-m telescope at Saitama University, Japan. The R-band imageswere obtained continuously over a 2 hr period at the closest approach and forabout 5 hr on the next night. Results. The lightcurve data from the secondnight indicates a rotational period of 11.0 +1.8/-0.6 hr and a peak-to-peakamplitude of 1.59 +/- 0.02 mag. The brightness variation before and after theclosest approach was separated into two components that are derived from therotation and phase effect. We found that the phase curve slope of this asteroidis significantly shallower than those of other L-type asteroids. Conclusions.We suggest that 2012 DA14 is coated with a coarse surface that lacks fineregolith particles and/or a high albedo surface.

Time-series photometry of Earth flyby asteroid 2012 DA14