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On 2 November 2002, the Stardust space probe flew past Annefrank at a distance of 3079 km. Its images show the asteroid to be 6.6 × 5.0 × 3.4 km, twice as big as previously thought, and its main body shaped like a triangular prism with several visible impact craters. From the photographs, the albedo of Annefrank was computed to be between 0.18 and 0.24. Preliminary analysis of the Stardust imagery suggests that Annefrank may be a contact binary, although other possible explanations exist for its observed shape.
Rotation and poles
In October 2006, ground-based photometric observations were used in an attempt to measure Annefranks rotational period. Analysis of the ambiguous lightcurve gave a period of hours and a brightness variation of 0.25 magnitude with two alternative period solutions of 12 and 22.8 hours, respectively (U=2).
In January 2014, photometric observations at the Palomar Transient Factory gave a rotation period of and hours with an amplitude of 0.17 and 0.20 magnitude, respectively (U=2/2).
The lightcurve data suggests that Annefrank is not Lambertian, meaning that surface features, such as shadows from boulders and craters, play a role in the object's perceived brightness and not just the asteroid's relative size when seen from that orientation.
The body's shortest axis is approximately aligned perpendicular to its orbital plane.