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Early evolution of disrupted asteroid P/2016 G1 (PANSTARRS)

AutorMoreno, Fernando ; Licandro, J.; Cabrera-Lavers, A.; Pozuelos, Francisco José
Palabras claveMethods: numerical
Minor planets
Asteroids: individual (P/2016 G1 (PANSTARRS))
Fecha de publicación20-jul-2016
EditorAmerican Astronomical Society
Institute of Physics Publishing
CitaciónAstrophysical Journal Letters 826(2): L22 (2016)
ResumenWe present deep imaging observations of activated asteroid P/2016 G1 (PANSTARRS) using the 10.4 m Gran Telescopio Canarias (GTC) from 2016 late April to early June. The images are best interpreted as the result of a relatively short-duration event with an onset of about 350(+30)(-10) days before perihelion (i.e., around 2016 February 10), starting sharply and decreasing with 24(-7)(+10) days (HWHM). The results of the modeling imply that the emission of similar to 1.7. x. 10(7) kg of dust, if composed of particles of 1 mu m to 1 cm in radius, is distributed following a power law of index -3 and having a geometric albedo of 0.15. A detailed fitting of a conspicuous westward feature in the head of the comet-like object indicates that a significant fraction of the dust was ejected along a privileged direction right at the beginning of the event, which suggests that the parent body has possibly suffered an impact followed by a partial or total disruption. From the limiting magnitude reachable with the instrumental setup, and assuming a geometric albedo of 0.15 for the parent body, an upper limit for the size of possible fragment debris of similar to 50 m in radius is derived.
Versión del editorhttp://dx.doi.org/10.3847/2041-8205/826/2/L22
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