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Clustering the properties of near-Earth objects: physico-dynamical links among NEOs
INAF Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monte Porzio Catone, Roma, Italy.
INAF Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monte Porzio Catone, Roma, Italy.
INAF Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monte Porzio Catone, Roma, Italy; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA .
INAF Osservatorio Astronomico di Roma, Via Frascati 33, 00078 Monte Porzio Catone, Roma, Italy.
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2023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 674, article id A50Article in journal (Refereed) Published
Abstract [en]

Context. At present, near-Earth objects (NEOs) are being discovered at an ever-increasing rate. However, their physical characterisation is still significantly lagging behind. In particular, the taxonomic classification of newly discovered NEOs is of great importance with regard to improving our understanding of the population of NEOs.

Aims. In this context, our goal is to probe potential links between orbital properties of NEOs and their composition. We investigate whether we can make a reasonable guess about the taxonomic class of an NEO upon its discovery with a decent orbital accuracy.

Methods. We used a G-mode multivariate statistical clustering method to find homogeneous clusters in a dataset composed of orbital elements of NEOs. We adopted two approaches, using two sets of variables as inputs to the G-mode method. In each approach, we analysed the available taxonomic distribution of resulting clusters to find potential correlations with several unique parameters that distinctively characterise NEOs. We then applied a dynamical model on the same clusters to trace their escape regions.

Results. Approach 1 (A1) led us to obtain NEO clusters that can be linked to a primitive composition. This result was further strengthened by the dynamical model, which mapped outer-belt sources as escape regions for these clusters. We remark on the finding of a cluster akin to S-type NEOs in highly eccentric orbits during the same approach (A1). Two clusters, one with small NEOs in terrestriallike orbits and one with relatively high inclinations, were found to be common to both approaches. Approach 2 (A2) revealed three clusters that are only separable by their arguments of perihelion. Taken altogether, they make up the majority of known Atira asteroids.

Conclusions. For an NEO whose orbit is relatively well determined, we propose a model to determine whether the taxonomy of an NEO is siliceous or primitive if the orbital elements of the NEO fall within the presented combinations of inclination, eccentricity, and semi-major axis ranges.

Place, publisher, year, edition, pages
EDP Sciences, 2023. Vol. 674, article id A50
Keywords [en]
minor planets, asteroids: general, techniques: spectroscopic, methods: statistical
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-99347DOI: 10.1051/0004-6361/202245316ISI: 001000113500007Scopus ID: 2-s2.0-85162083024OAI: oai:DiVA.org:ltu-99347DiVA, id: diva2:1786472
Funder
EU, Horizon 2020, 870403
Note

Validerad;2023;Nivå 2;2023-08-09 (joosat);

Funder: Agenzia Spaziale Italiana (ASI, contract no. 2017-37-H.0 CUP F82F17000630005)

Licens fulltext: CC BY License

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2023-08-09Bibliographically approved

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Granvik, Mikael

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