Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu

Driss Takir, Beth Ellen Clark, Christian Drouet d'Aubigny, Carl W. Hergenrother, Jian Yang Li, Dante Lauretta, Richard P. Binzel

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We used ground-based photometric phase curve data of the OSIRIS-REx target Asteroid (101955) Bennu and low phase angle data from Asteroid (253) Mathilde as a proxy to fit Bennu data with Minnaert, Lommel-Seeliger, (RObotic Lunar Orbiter) ROLO, Hapke, and McEwen photometric models, which capture the global light scattering properties of the surface and subsequently allow us to calculate the geometric albedo, phase integral, spherical Bond albedo, and the average surface normal albedo for Bennu. We find that Bennu has low reflectance and geometric albedo values, such that multiple scattering is expected to be insignificant. Our photometric models relate the reflectance from Bennu's surface to viewing geometry as functions of the incidence, emission, and phase angles. Radiance Factor functions (RADFs) are used to model the disk-resolved brightness of Bennu. The Minnaert, Lommel-Seeliger, ROLO, and Hapke photometric models work equally well in fitting the best ground-based photometric phase curve data of Bennu. The McEwen model works reasonably well at phase angles from 20° to 70°. Our calculated geometric albedo values of 0.047-0.014+0.012,0.047-0.014+0.005, and 0.048-0.022+0.012 for the Minnaert, the Lommel-Seeliger, and the ROLO models respectively are consistent with the geometric albedo of 0.045 ± 0.015 computed by Emery et al. (Emery, J.P. et al. [2014]. Icarus 234, 17-35) and Hergenrother et al. (Hergenrother, C.W. et al. [2014]. <http://arxiv.org/abs/1409.4704>). Also, our spherical Bond albedo values of 0.016-0.004+0.005,0.015-0.001+0.003, and 0.015-0.005+0.007 for the Minnaert model, Lommel-Seeliger, and ROLO models respectively are consistent with the value of 0.017 ± 0.002 presented by Emery et al. (Emery, J.P. et al. [2014]. Icarus 234, 17-35). On the other hand, the semi-physical models such as the Hapke model, where several assumptions and approximations were necessary, and the McEwen model are not supported by the global disk-integrated data, indicating that disk-resolved measurements will be necessary to constrain these models, as expected.

Original languageEnglish (US)
Pages (from-to)393-399
Number of pages7
JournalIcarus
Volume252
DOIs
StatePublished - May 5 2015

Fingerprint

OSIRIS
asteroids
asteroid
albedo
phase shift
reflectance
Lunar Orbiter
light scattering
curves
robotics
radiance

Keywords

  • Asteroids
  • Near-Earth objects
  • Photometry

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Takir, D., Clark, B. E., Drouet d'Aubigny, C., Hergenrother, C. W., Li, J. Y., Lauretta, D., & Binzel, R. P. (2015). Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu. Icarus, 252, 393-399. https://doi.org/10.1016/j.icarus.2015.02.006

Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu. / Takir, Driss; Clark, Beth Ellen; Drouet d'Aubigny, Christian; Hergenrother, Carl W.; Li, Jian Yang; Lauretta, Dante; Binzel, Richard P.

In: Icarus, Vol. 252, 05.05.2015, p. 393-399.

Research output: Contribution to journalArticle

Takir, D, Clark, BE, Drouet d'Aubigny, C, Hergenrother, CW, Li, JY, Lauretta, D & Binzel, RP 2015, 'Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu', Icarus, vol. 252, pp. 393-399. https://doi.org/10.1016/j.icarus.2015.02.006
Takir, Driss ; Clark, Beth Ellen ; Drouet d'Aubigny, Christian ; Hergenrother, Carl W. ; Li, Jian Yang ; Lauretta, Dante ; Binzel, Richard P. / Photometric models of disk-integrated observations of the OSIRIS-REx target Asteroid (101955) Bennu. In: Icarus. 2015 ; Vol. 252. pp. 393-399.
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AU - Hergenrother, Carl W.

AU - Li, Jian Yang

AU - Lauretta, Dante

AU - Binzel, Richard P.

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N2 - We used ground-based photometric phase curve data of the OSIRIS-REx target Asteroid (101955) Bennu and low phase angle data from Asteroid (253) Mathilde as a proxy to fit Bennu data with Minnaert, Lommel-Seeliger, (RObotic Lunar Orbiter) ROLO, Hapke, and McEwen photometric models, which capture the global light scattering properties of the surface and subsequently allow us to calculate the geometric albedo, phase integral, spherical Bond albedo, and the average surface normal albedo for Bennu. We find that Bennu has low reflectance and geometric albedo values, such that multiple scattering is expected to be insignificant. Our photometric models relate the reflectance from Bennu's surface to viewing geometry as functions of the incidence, emission, and phase angles. Radiance Factor functions (RADFs) are used to model the disk-resolved brightness of Bennu. The Minnaert, Lommel-Seeliger, ROLO, and Hapke photometric models work equally well in fitting the best ground-based photometric phase curve data of Bennu. The McEwen model works reasonably well at phase angles from 20° to 70°. Our calculated geometric albedo values of 0.047-0.014+0.012,0.047-0.014+0.005, and 0.048-0.022+0.012 for the Minnaert, the Lommel-Seeliger, and the ROLO models respectively are consistent with the geometric albedo of 0.045 ± 0.015 computed by Emery et al. (Emery, J.P. et al. [2014]. Icarus 234, 17-35) and Hergenrother et al. (Hergenrother, C.W. et al. [2014]. ). Also, our spherical Bond albedo values of 0.016-0.004+0.005,0.015-0.001+0.003, and 0.015-0.005+0.007 for the Minnaert model, Lommel-Seeliger, and ROLO models respectively are consistent with the value of 0.017 ± 0.002 presented by Emery et al. (Emery, J.P. et al. [2014]. Icarus 234, 17-35). On the other hand, the semi-physical models such as the Hapke model, where several assumptions and approximations were necessary, and the McEwen model are not supported by the global disk-integrated data, indicating that disk-resolved measurements will be necessary to constrain these models, as expected.

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