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At a mean diameter of ~650 m, the near-Earth asteroid (455213) 2001 OE84(OE84 for short) has a rapid rotation period of 0.486542+-0.2 hours, whichis uncommon for asteroids larger than ~200 m. We revisited OE84 14 years afterit was first, and last, observed by Pravec et al. (2002) in order to measureagain its spin rate and to search for changes. We have confirmed the rapidrotation and, by fitting the photometric data from 2001 and 2016 using thelightcurve inversion technique, we determined a retrograde sense of rotation,with the spin axis close to the ecliptic south pole; an oblate shape model ofa/b=1.32+-0.04 and b/c=1.8+-0.2; and no change in spin rate between 2001 and2016. Using these parameters we constrained the body's internal strength, andfound that current estimations of asteroid cohesion (up to ~80 Pa) areinsufficient to maintain an intact rubble pile at the measured spin rate ofOE84. Therefore, we argue that a monolithic asteroid, that can rotate at therate of OE84 without shedding mass and without slowing down its spin rate, isthe most plausible for OE84, and we give constraints on its age, since the timeit was liberated from its parent body, between 2-10 million years.

The fast spin of near-Earth asteroid (455213) 2001 OE84, revisited after 14 years: constraints on internal structure