  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.
