2013/11/06 by David Jewitt, Jessica Agarwal, Harold Weaver +2 · 7 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Planetary Science and Exploration #astro-ph.EP
paper · pdf · doi:10.1088/2041-8205/778/1/l21
13 pages, two figures, three tables, Accepted to ApJL
arxiv created 2013/11/06 · openalex publication_date 2013/11/07 · arxiv updated 2015/06/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Hubble Space Telescope observations of main-belt comet P/2013 P5 reveal an extraordinary system of six dust tails that distinguish this object from any other. Observations two weeks apart show dramatic morphological change in the tails while providing no evidence for secular fading of the object as a whole. Each tail is associated with a unique ejection date, revealing continued, episodic mass loss from the 0.24+/-0.04 km radius nucleus over the last five months. As an inner-belt asteroid and probable Flora family member, the object is likely to be highly metamorphosed and unlikely to contain ice. The protracted period of dust release appears inconsistent with an impact origin, but may be compatible with a body that is losing mass through a rotational instability. We suggest that P/2013 P5 has been accelerated to breakup speed by radiation torques.