Brightness variation distributions among main belt asteroids from sparse light-curve sampling with Pan-STARRS 1
The rotational state of asteroids is controlled by various physical mechanisms including collisions, internal damping and the Yarkovsky–O'Keefe–Radzievskii–Paddack effect. We have analysed the changes in magnitude between consecutive detections of ∼60 000 asteroids measured by the Panoramic Sur...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2016-07, Vol.459 (3), p.2964-2972 |
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Sprache: | eng |
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Zusammenfassung: | The rotational state of asteroids is controlled by various physical mechanisms including collisions, internal damping and the Yarkovsky–O'Keefe–Radzievskii–Paddack effect. We have analysed the changes in magnitude between consecutive detections of ∼60 000 asteroids measured by the Panoramic Survey Telescope and Rapid Response System (PanSTARRS) 1 survey during its first 18 months of operations. We have attempted to explain the derived brightness changes physically and through the application of a simple model. We have found a tendency towards smaller magnitude variations with decreasing diameter for objects of 1 < D < 8 km. Assuming the shape distribution of objects in this size range to be independent of size and composition our model suggests a population with average axial ratios 1 : 0.85 ± 0.13 : 0.71 ± 0.13, with larger objects more likely to have spin axes perpendicular to the orbital plane. |
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ISSN: | 0035-8711 1365-2966 |
DOI: | 10.1093/mnras/stw847 |