Phase curve and albedo of asteroid 5535 Annefrank

Physics

Scientific paper

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Planetology: Solar System Objects: Instruments And Techniques, Planetology: Comets And Small Bodies: Remote Sensing, Planetology: Solar System Objects: Asteroids And Meteoroids

Scientific paper

Seventy-two images of the S-class asteroid 5535 Annefrank, acquired on 2 November 2002 at target ranges of 11,415-3078.5 km, were transmitted to Earth as a part of an engineering readiness test of the Stardust mission. Forty-four of these were used to create a phase curve extending to 134°, the largest angle yet achieved for any S-class asteroid. Flux fell by more than six magnitudes between the extrapolated 0° and 134°. A maximum illuminated cross section of 16 km2 was seen at a phase angle of 47.2°. Assuming a camera efficiency of 75%, a broadband (470-940 nm) geometric albedo of 0.24 was derived for Annefrank.

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