Hemispherical differences in the shape and topography of asteroid (101955) Bennu

M. G. Daly; O. S. Barnouin; J. A. Seabrook; J. Roberts; C. Dickinson; K. J. Walsh; E. R. Jawin; E. E. Palmer; R. Gaskell; J. Weirich; T. Haltigin; D. Gaudreau; C. Brunet; G. Cunningham; P. Michel; Y. Zhang; R. L. Ballouz; G. Neumann; M. E. Perry; L. Philpott; M. M. Al Asad; C. L. Johnson; C. D. Adam; J. M. Leonard; J. L. Geeraert; K. Getzandanner; M. C. Nolan; R. T. Daly; E. B. Bierhaus; E. Mazarico; B. Rozitis; A. J. Ryan; D. N. Dellaguistina; B. Rizk; H. C.M. Susorney; H. L. Enos; D. S. Lauretta

doi:10.1126/sciadv.abd3649

Hemispherical differences in the shape and topography of asteroid (101955) Bennu

M. G. Daly, O. S. Barnouin, J. A. Seabrook, J. Roberts, C. Dickinson, K. J. Walsh, E. R. Jawin, E. E. Palmer, R. Gaskell, J. Weirich, T. Haltigin, D. Gaudreau, C. Brunet, G. Cunningham, P. Michel, Y. Zhang, R. L. Ballouz, G. Neumann, M. E. Perry, L. PhilpottM. M. Al Asad, C. L. Johnson, C. D. Adam, J. M. Leonard, J. L. Geeraert, K. Getzandanner, M. C. Nolan, R. T. Daly, E. B. Bierhaus, E. Mazarico, B. Rozitis, A. J. Ryan, D. N. Dellaguistina, B. Rizk, H. C.M. Susorney, H. L. Enos, D. S. Lauretta

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Abstract

We investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling the northern and southern hemispheres separately, we find that longitudinal ridges previously identified in the north extend into the south but are obscured there by surface material. In the south, more numerous large boulders effectively retain surface materials and imply a higher average strength at depth to support them. The north has fewer large boulders and more evidence of boulder dynamics (toppling and downslope movement) and surface flow. These factors result in Bennu's southern hemisphere being rounder and smoother, whereas its northern hemisphere has higher slopes and a less regular shape. We infer an originally asymmetric distribution of large boulders followed by a partial disruption, leading to wedge formation in Bennu's history.

Original language	English (US)
Article number	eabd3649
Journal	Science Advances
Volume	6
Issue number	41
DOIs	https://doi.org/10.1126/sciadv.abd3649
State	Published - Oct 7 2020

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Daly, M. G., Barnouin, O. S., Seabrook, J. A., Roberts, J., Dickinson, C., Walsh, K. J., Jawin, E. R., Palmer, E. E., Gaskell, R., Weirich, J., Haltigin, T., Gaudreau, D., Brunet, C., Cunningham, G., Michel, P., Zhang, Y., Ballouz, R. L., Neumann, G., Perry, M. E., ... Lauretta, D. S. (2020). Hemispherical differences in the shape and topography of asteroid (101955) Bennu. Science Advances, 6(41), Article eabd3649. https://doi.org/10.1126/sciadv.abd3649

Daly, MG, Barnouin, OS, Seabrook, JA, Roberts, J, Dickinson, C, Walsh, KJ, Jawin, ER, Palmer, EE, Gaskell, R, Weirich, J, Haltigin, T, Gaudreau, D, Brunet, C, Cunningham, G, Michel, P, Zhang, Y, Ballouz, RL, Neumann, G, Perry, ME, Philpott, L, Al Asad, MM, Johnson, CL, Adam, CD, Leonard, JM, Geeraert, JL, Getzandanner, K, Nolan, MC, Daly, RT, Bierhaus, EB, Mazarico, E, Rozitis, B, Ryan, AJ, Dellaguistina, DN, Rizk, B, Susorney, HCM, Enos, HL & Lauretta, DS 2020, 'Hemispherical differences in the shape and topography of asteroid (101955) Bennu', Science Advances, vol. 6, no. 41, eabd3649. https://doi.org/10.1126/sciadv.abd3649

@article{befa8bae677e4548841535554965b2ea,

title = "Hemispherical differences in the shape and topography of asteroid (101955) Bennu",

abstract = "We investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling the northern and southern hemispheres separately, we find that longitudinal ridges previously identified in the north extend into the south but are obscured there by surface material. In the south, more numerous large boulders effectively retain surface materials and imply a higher average strength at depth to support them. The north has fewer large boulders and more evidence of boulder dynamics (toppling and downslope movement) and surface flow. These factors result in Bennu's southern hemisphere being rounder and smoother, whereas its northern hemisphere has higher slopes and a less regular shape. We infer an originally asymmetric distribution of large boulders followed by a partial disruption, leading to wedge formation in Bennu's history.",

author = "Daly, {M. G.} and Barnouin, {O. S.} and Seabrook, {J. A.} and J. Roberts and C. Dickinson and Walsh, {K. J.} and Jawin, {E. R.} and Palmer, {E. E.} and R. Gaskell and J. Weirich and T. Haltigin and D. Gaudreau and C. Brunet and G. Cunningham and P. Michel and Y. Zhang and Ballouz, {R. L.} and G. Neumann and Perry, {M. E.} and L. Philpott and {Al Asad}, {M. M.} and Johnson, {C. L.} and Adam, {C. D.} and Leonard, {J. M.} and Geeraert, {J. L.} and K. Getzandanner and Nolan, {M. C.} and Daly, {R. T.} and Bierhaus, {E. B.} and E. Mazarico and B. Rozitis and Ryan, {A. J.} and Dellaguistina, {D. N.} and B. Rizk and Susorney, {H. C.M.} and Enos, {H. L.} and Lauretta, {D. S.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).",

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T1 - Hemispherical differences in the shape and topography of asteroid (101955) Bennu

AU - Daly, M. G.

AU - Barnouin, O. S.

AU - Seabrook, J. A.

AU - Roberts, J.

AU - Dickinson, C.

AU - Walsh, K. J.

AU - Jawin, E. R.

AU - Palmer, E. E.

AU - Gaskell, R.

AU - Weirich, J.

AU - Haltigin, T.

AU - Gaudreau, D.

AU - Brunet, C.

AU - Cunningham, G.

AU - Michel, P.

AU - Zhang, Y.

AU - Ballouz, R. L.

AU - Neumann, G.

AU - Perry, M. E.

AU - Philpott, L.

AU - Al Asad, M. M.

AU - Johnson, C. L.

AU - Adam, C. D.

AU - Leonard, J. M.

AU - Geeraert, J. L.

AU - Getzandanner, K.

AU - Nolan, M. C.

AU - Daly, R. T.

AU - Bierhaus, E. B.

AU - Mazarico, E.

AU - Rozitis, B.

AU - Ryan, A. J.

AU - Dellaguistina, D. N.

AU - Rizk, B.

AU - Susorney, H. C.M.

AU - Enos, H. L.

AU - Lauretta, D. S.

N1 - Publisher Copyright: © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

PY - 2020/10/7

Y1 - 2020/10/7

N2 - We investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling the northern and southern hemispheres separately, we find that longitudinal ridges previously identified in the north extend into the south but are obscured there by surface material. In the south, more numerous large boulders effectively retain surface materials and imply a higher average strength at depth to support them. The north has fewer large boulders and more evidence of boulder dynamics (toppling and downslope movement) and surface flow. These factors result in Bennu's southern hemisphere being rounder and smoother, whereas its northern hemisphere has higher slopes and a less regular shape. We infer an originally asymmetric distribution of large boulders followed by a partial disruption, leading to wedge formation in Bennu's history.

AB - We investigate the shape of near-Earth asteroid (101955) Bennu by constructing a high-resolution (20 cm) global digital terrain model from laser altimeter data. By modeling the northern and southern hemispheres separately, we find that longitudinal ridges previously identified in the north extend into the south but are obscured there by surface material. In the south, more numerous large boulders effectively retain surface materials and imply a higher average strength at depth to support them. The north has fewer large boulders and more evidence of boulder dynamics (toppling and downslope movement) and surface flow. These factors result in Bennu's southern hemisphere being rounder and smoother, whereas its northern hemisphere has higher slopes and a less regular shape. We infer an originally asymmetric distribution of large boulders followed by a partial disruption, leading to wedge formation in Bennu's history.

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JO - Science Advances

JF - Science Advances

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M1 - eabd3649

ER -

Hemispherical differences in the shape and topography of asteroid (101955) Bennu

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