The impact of asteroid shapes and topographies on their reflectance spectroscopy

Potin, S.; Douté, S.; Kugler, Benoit; Forbes, Florence

doi:10.1016/j.icarus.2021.114806

Cited by 5 publications

(2 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect on brightness predictions could also impact space-based intercept and rendezvous missions which rely on camera imaging for guidance and navigation control. Geometric effects have already been shown to affect unresolved reflectance spectroscopy of asteroids (Potin et al 2022).…”

Section: Consequences Of Aspect-induced Variabilitymentioning

confidence: 99%

The effect of aspect changes on Near-Earth Asteroid phase curves

Jackson

Rozitis

Dover

et al. 2022

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Phase curves of asteroids are typically considered to depend solely on the scattering properties of airless particulate surfaces and the size of the object being studied. In this study, we demonstrate the additional dependence of phase curves on object shape, rotation pole orientation, and viewing geometry over an apparition. Variations in the phase curve of near-Earth asteroid (159402) 1999 AP10 over its apparition from July 2020 - January 2021 are verified to be due to aspect changes over the apparition. This is achieved through shape modelling of the asteroid and simulation of the phase curve over the apparition. We present simulations of asteroid phase curves over a range of geometries to understand the potential magnitude of this aspect effect, and under which circumstances it can begin to dominate in the phase curves. This dependence on aspect may introduce significant additional uncertainty in the properties derived from phase curve data. We provide and demonstrate software code to estimate the aspect-related uncertainty in near-Earth asteroid phase curves through simulation and model fitting of a randomly generated sample of ellipsoidal asteroid models over the observed viewing geometry. We demonstrate how ignoring this effect may lead to misleading interpretations of the data and underestimation of uncertainties in further studies, such as those in the infrared that use phase curve derived parameters when fitting physical properties of an asteroid.

show abstract

Section: Consequences Of Aspect-induced Variabilitymentioning

confidence: 99%

The effect of aspect changes on Near-Earth Asteroid phase curves

Jackson

Rozitis

Dover

et al. 2022

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…We performed bidirectional reflectance measurements using different instruments according to the wavelength range investigated. Bidirectional measurements were commonly used in planetary science laboratory experiments (e.g., Bishop et al 1994;Brucato et al 2010;Takir et al 2019;Beck et al 2021;Sultana et al 2021;Potin et al 2022) and allow a better comparison with data obtained by space missions. For the visible and near-infrared, we used the Spectrophotometer with cHanging Angles for Detection Of Weak Signals (SHADOWS) at IPAG.…”

Section: Reflectance Measurementsmentioning

confidence: 99%

Development of a new Phobos spectral simulant: spectral properties from visible to the mid-infrared range

Wargnier

Poggiali

Doressoundiram

et al. 2023

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Phobos is the target of Martian Moons eXploration (MMX) the next sample return mission of the Japanese space agency (JAXA). The mission will investigate the origin of Phobos and Deimos – the two martian moons, using a suite of dedicated instruments. Infrared analysis of the surface composition will be performed by the MIRS spectrometer onboard MMX. Within the scientific studies performed in preparation of the mission, we developed a new laboratory spectral simulant that well reproduces the red and featureless spectrum of Phobos. Our results show that a visible and near-infrared simulant can be developed using dark opaque materials such as anthracite and coal to reduce the reflectance and absorption features. To investigate the reliability of our proposed simulant in terms of composition and mineralogy we discussed the similarities and differences in the mid-infrared (MIR) range between our laboratory simulant and some past observations acquired on Phobos. Spectra with different observation geometries were also acquired for our simulant which gives information about grain size and textures of the surface. The simulant developed in our study presents a better match for the Phobos spectrum in the visible and near-infrared compared to the previously proposed simulants.

show abstract