@article{155d393daa8b433db351bb9d7bf481b2,
title = "A 2km-size asteroid challenging the rubble-pile spin barrier - A case for cohesion",
abstract = "The rubble pile spin barrier is an upper limit on the rotation rate of asteroids larger than ~200-300. m. Among thousands of asteroids with diameters larger than ~300. m, only a handful of asteroids are known to rotate faster than 2.0. h, all are in the sub-km range (≤0.6. km). Here we present photometric measurements suggesting that (60716) 2000 GD65, an S-complex, inner-main belt asteroid with a relatively large diameter of 2.3-0.7+0.6km, completes one rotation in 1.9529. ±. 0.0002. h. Its unique diameter and rotation period allow us to examine scenarios about asteroid internal structure and evolution: a rubble pile bound only by gravity; a rubble-pile with strong cohesion; a monolithic structure; an asteroid experiencing mass shedding; an asteroid experiencing YORP spin-up/down; and an asteroid with a unique octahedron shape results with a four-peak lightcurve and a 3.9. h period. We find that the most likely scenario includes a lunar-like cohesion that can prevent (60716) 2000 GD65 from disrupting without requiring a monolithic structure or a unique shape. Due to the uniqueness of (60716) 2000 GD65, we suggest that most asteroids typically have smaller cohesion than that of lunar regolith.",
keywords = "Asteroids, Asteroids, rotation, Photometry, Rotational dynamics",
author = "D. Polishook and N. Moskovitz and Binzel, {R. P.} and B. Burt and DeMeo, {F. E.} and Hinkle, {M. L.} and M. Lockhart and M. Mommert and M. Person and A. Thirouin and Thomas, {C. A.} and D. Trilling and M. Willman and O. Aharonson",
note = "Funding Information: We are grateful to the referees for their thorough reports that improve the manuscript. We thank William Bottke and Dave O{\textquoteright}Brien for their insights and fruitful discussion. DP is grateful to the Ministry of Science, Technology and Space of the Israeli government for their Ramon fellowship for post-docs, and the AXA Research Fund for their generous post-doc fellowship, during the years of observations and analysis. FED acknowledges funding from NASA under Grant No. NNX12AL26G . CAT was supported by an appointment to the NASA Postdoctoral Program at Goddard Space Flight Center, administrated by Oak Ridge Associated Universities through a contract with NASA. OA would like to acknowledge support from the Helen Kimmel Center for Planetary Science and the ISF I-CORE program “Origins: From the Big Bang to Planets”. Funding Information: We acknowledge support from NASA NEOO Grant No. NNX14AN82G , awarded to the Mission Accessible Near-Earth Object Survey (MANOS). We are thankful to the Wise Observatory staff for their continuous help and generous time allocation. Observations for this study were performed in Arizona, Chile, Hawaii and Israel. The people of all nations that support hosting professional observatories are praised for understanding and supporting the importance of astronomical studies. Publisher Copyright: {\textcopyright} 2015 Elsevier Inc.",
year = "2016",
month = mar,
day = "15",
doi = "10.1016/j.icarus.2015.12.031",
language = "English (US)",
volume = "267",
pages = "243--254",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
}