The SMART-1 AMIE experiment: implication to the lunar opposition effect

Muinonen, K.; Shkuratov, Yu. G.; Ovcharenko, Andrey; Piironen, J.; Stankevich, D. G.; Miloslavskaya, O. V.; Kaasalainen, Sanna; Josset, Jean-Luc

doi:10.1016/s0032-0633(02)00128-9

Cited by 26 publications

(6 citation statements)

References 26 publications

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“…When observations are performed over a time span covering a sufficient range of different illumination conditions, described by the so-called phase angle (the angle between the directions to the Sun and to the observer as seen from the asteroid), it is possible to analyze the general variation in brightness observed for a given aspect angle, but at a variety of possible phase angles ("phase curve"). This information is an important input to the theories of scattering of sunlight by asteroidal surfaces, and, coupled with complementary polarimetric observations, provides information about some physical properties of asteroid surfaces Muinonen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Genetic inversion of sparse disk-integrated photometric data of asteroids: application to Hipparcos data

Cellino

Hestroffer²,

Tanga³

et al. 2009

A&A

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Context. The development of techniques for the inversion of sparse disk-integrated photometric data of asteroids is a very urgent task, due to the imminent commencements of large sky surveys from both space (Gaia) and the ground (Pan-STARRS). Aims. We developed a numerical algorithm for the inversion of sparse photometric data of asteroids. An application to real data collected in past by the Hipparcos satellite provided very encouraging results. Methods. The inversion method is based on the application of a "genetic" algorithm approach. The objects are assumed to have triaxial ellipsoid shape. However, it is shown by means of simulations and applications to real data that this simplistic choice does not cause any significant problems. The algorithm solves for a number of unknown parameters, including the spin period, the coordinates of the spin axis, the axial ratios of the ellipsoid, an initial rotational phase corresponding to the first observation of a given dataset, and the slope of a linear variation in the magnitude as a function of solar phase. Additional parameters, describing some possible albedo variegation of the surface, can also be introduced. Results. The application of the inversion technique to both simulations and a dataset of sparse photometric data obtained some years ago by the Hipparcos satellite shows that the performance of the algorithm is strongly encouraging, and the correct solution for the rotational parameters is obtained in the majority of cases when a reasonable number of observations are available.

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Section: Introductionmentioning

confidence: 99%

Genetic inversion of sparse disk-integrated photometric data of asteroids: application to Hipparcos data

Cellino

Hestroffer²,

Tanga³

et al. 2009

A&A

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“…The effects of physical parameters on a simple peak-type feature are neither well understood nor adequately described by most theoretical models. The current physical interpretation of the opposition effect (a brightness surge near zero phase angle) is based on two phenomena: shadowing and coherent backscattering (Hapke 2002;Shkuratov et al 2002;Muinonen et al 2002;Mishchenko et al 2000), but none of these models is yet suitable for effective inversion.…”

Section: Introductionmentioning

confidence: 99%

Laboratory photometry of planetary regolith analogs

Kaasalainen

2003

A&A

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Abstract. New laboratory phase curves are presented to act as ground truth for solar system regolith photometry. The effects of physical parameters such as grain size, surface roughness, and packing density on backscattering peak can be recognized, but it turns out that the same parameter may have different effects depending on the sample, and the parameter effects are mixed with each other. These are a strong limitations to modelling, since the scattering models usually do not distinguish between compositions or predict different effects of same parameters. Furthermore, attention should be paid not only to physical but chemical characteristics as well. This emphasizes the role of experiments in the study of the opposition effect and surface characterization. As the experimental approach to scattering study becomes more significant, the laboratory methods for backscattering must be constantly improved to suit better the remote sensing purposes and achieve a large database.

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“…Also, the flattening on logarithmic scale is not only due to the angular size of the Sun. It may be observed over a wide range of phase angles, see [70].…”

Section: Convolved Datamentioning

confidence: 99%

Variations of the apparent angular size of the Sun across the entire Solar System: Implications for planetary opposition surges

Déau

2012

Journal of Quantitative Spectroscopy and Radiative Transfer

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We test several convolution and deconvolution models on phase curves at small phase angles ð0:0011 o ao1:51Þ that have the highest phase angle sampling to date. These curves were provided by cameras onboard several NASA missions (Clementine/UVVIS, Galileo/SSI and Cassini/ISS) when the Sun had different apparent angular radii (a ¼ 0:2661, 0.0511, 0.0281). For the smallest phase angles, the brightness of the objects (Moon, Europa and the Saturn's rings) exhibits a strong round-off below the angular size of the Sun. The brightness continues to increase below a before finally flattening at 0:4a. These behaviors are consistent with the convolution models tested. A simple deconvolution model is also used and agrees with laboratory measurements at extremely small phase angles that do not show any flattening [Psarev V, Ovcharenko A, Shkuratov YG, Belskaya I, Videen G. Photometry of particulate surfaces at extremely small phase angles.

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The SMART-1 AMIE experiment: implication to the lunar opposition effect

Cited by 26 publications

References 26 publications

Genetic inversion of sparse disk-integrated photometric data of asteroids: application to Hipparcos data

Genetic inversion of sparse disk-integrated photometric data of asteroids: application to Hipparcos data

Laboratory photometry of planetary regolith analogs

Variations of the apparent angular size of the Sun across the entire Solar System: Implications for planetary opposition surges

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