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Six Years of Sustained Activity from Active Asteroid (6478) Gault

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arxiv 1904.10530 v2 pith:F4CEKZFW submitted 2019-04-23 astro-ph.EP

Six Years of Sustained Activity from Active Asteroid (6478) Gault

classification astro-ph.EP
keywords activitygaultactiveasteroidbeltmainobjectrotational
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present archival observations demonstrating that main belt asteroid (6478) Gault has an extensive history of comet-like activity. Outbursts have taken place during multiple epochs since 2013 and at distances extending as far as 2.68 au, nearly aphelion. (6478) Gault is a member of the predominately S-type (i.e., volatile-poor) Phocaea family; no other main belt object of this type has ever shown more than a single activity outburst. Furthermore, our data suggest that this is the longest duration of activity caused by a body spinning near the rotational breakup barrier. If activity is indeed unrelated to volatiles, as appears to be the case, (6478) Gault represents a new class of object, perpetually active due to rotational spin-up.

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