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Modelling asteroids with low spin axis inclination

Presentation #411.08 in the session Asteroids: Main Belt (Poster)

Published onOct 23, 2023
Modelling asteroids with low spin axis inclination

With the advent of more sophisticated modeling techniques in the early 2000s, such as lightcurve inversion, it has become possible to determine asteroid spin parameters and shape more accurately and robustly than in the past. As a result, the number of asteroids with available spin and shape model has continued to grow, enabling statistical studies to better understand the evolution of the solar system. However, several sources of selection effects can pollute the statistics and potentially lead to biased conclusions about the solar system evolution. One potential selection effect is related to small asteroids with low spin axis inclination. Such objects are often viewed close to pole-on aspect, showing no brightness changes due to rotation, which challenges the lightcurve inversion. Therefore, we focused on modeling asteroids that could potentially belong to this category. We exclusively used dense lightcurves of good quality, mostly gathered in the targeted campaign. Each of our targets has been observed during multiple apparitions, often spanning over 20 years. We combined these archives with data from space telescopes (such as TESS and Kepler) capable of providing high-quality multiple coverage of the complete rotation. Ultimately, we obtained arround a dozen or so high-quality models of low spin axis asteroids, that had either never been modeled before or had poorly constrained models in the past.

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