Extended photometric survey of near-Earth objects

Ieva, S.; Dotto, E.; Epifani, E. Mazzotta; Perna, D.; Fanasca, Cristina; Lazzarin, M.; Bertini, Ivano; Petropoulou, V.; Rossi, Alessandro; Micheli, M.; Perozzi, E.

doi:10.1051/0004-6361/202038968

Cited by 8 publications

(9 citation statements)

References 28 publications

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“…C-complex members represent 16% in our sample, which is close to the percentage reported by Binzel et al (2019) and Ieva et al (2020) and higher than the value in Binzel et al (2004). D-type asteroids, which represent 12% of our sample, are slightly more abundant than in other surveys for which the amount of D-type NEOs does not exceed ∼7% (e.g., Binzel et al 2004Binzel et al , 2019Ieva et al 2020). Finally, the percentage of A-and V-type NEOs remains rather low across all mentioned surveys, but A-type asteroids nevertheless tend to be more abundant among small NEOs (e.g., Perna et al 2018).…”

Section: Discussionsupporting

confidence: 89%

“…The percentage of X-complex asteroids found in our survey is similar to the value reported by (Devogèle et al 2019) of about 20%. However, this value is lower in comparison with the percentage found by Binzel et al (2004Binzel et al ( , 2019, and Ieva et al (2020) of about 10%. C-complex members represent 16% in our sample, which is close to the percentage reported by Binzel et al (2019) and Ieva et al (2020) and higher than the value in Binzel et al (2004).…”

Section: Discussioncontrasting

confidence: 63%

“…However, this value is lower in comparison with the percentage found by Binzel et al (2004Binzel et al ( , 2019, and Ieva et al (2020) of about 10%. C-complex members represent 16% in our sample, which is close to the percentage reported by Binzel et al (2019) and Ieva et al (2020) and higher than the value in Binzel et al (2004). D-type asteroids, which represent 12% of our sample, are slightly more abundant than in other surveys for which the amount of D-type NEOs does not exceed ∼7% (e.g., Binzel et al 2004Binzel et al , 2019Ieva et al 2020).…”

Section: Discussioncontrasting

confidence: 63%

“…Additionally, the authors found no difference in the distribution of PHAs and nonPHAs. At the same time, a decrease in S + Q complexes and an increase in dark asteroids is found for higher H (Ieva et al 2020;Devogèle et al 2019;Perna et al 2018). The fraction of Q-type asteroids that are believed to be "fresh" or "unweathered" S-types (Binzel et al 1996) increases due to a combination of effects, such as the YORP-effect, planetary encounters, and seismic shaking (Binzel et al 2004(Binzel et al , 2010Nesvorný et al 2005).…”

Section: Discussionmentioning

confidence: 92%

“…A number of surveys have been dedicated to the study of NEOs (e.g. Binzel et al 2004Binzel et al , 2019Devogèle et al 2019;Ieva et al 2018Ieva et al , 2020Perna et al 2018;Popescu et al 2019), and as each survey focuses on a certain group of objects (i.e., based on diameters, orbital parameters, etc. ), they compliment each other and help us to gain a broader understanding of the NEO population as a whole.…”

Section: Discussionmentioning

confidence: 99%

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Photometric survey of 55 near-earth asteroids

Hromakina

Birlan

Fulchignoni

et al. 2021

A&A

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Context. Near-earth objects (NEOs), thanks to their proximity, provide a unique opportunity to investigate asteroids with diameters down to dozens of meters. The study of NEOs is also important because of their potential hazard to the Earth. The investigation of small NEOs is challenging from Earth as they are observable only for a short time following their discovery and can sometimes only be reached again years or decades later. Aims. We aim to derive the visible colors of NEOs and perform an initial taxonomic classification with a main focus on smaller objects and recent discoveries. Methods. Photometric observations were performed using the 1.2 m telescope at the Haute-Provence observatory and the 1.0 m telescope at the Pic du Midi observatory in broadband Johnson-Cousins and Sloan photometric systems. Results. We present new photometric observations for 55 NEOs. Our taxonomic classification shows that almost half (43%) of the objects in our sample are classified as S+Q-complex members, 19% as X-complex, 16% as C-complex, 12% as D-types, and finally 6% and 4% as A- and V-types, respectively. The distribution of the observed objects with H > 19 and H ≤ 19 remains almost the same. However, the majority of the objects in our dataset with D < 500 m belong to the “silicate” group, which is probably a result of an observational bias towards brighter and more accessible objects. “Carbonaceous” objects are predominant among those with a Jovian Tisserand parameter of Tj < 3. These bodies could be dormant or extinct comets. The median values of the absolute magnitude for “carbonaceous” and “silicate” groups are H = 18.10 ± 0.95 and H = 19.50 ± 1.20, whereas the estimated median diameters are D = 1219 ± 729 m and D = 344 ± 226 m, respectively. “Silicate” objects have a much lower median Earth’s minimum orbit intersection distance (MOID) and a somewhat lower orbital inclination in comparison to “carbonaceous” objects. About half of the observed objects are potentially hazardous asteroids and are mostly (almost 65%) represented by “silicate” objects.

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Section: Discussionsupporting

confidence: 89%

Section: Discussioncontrasting

confidence: 63%

Section: Discussioncontrasting

confidence: 63%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Photometric survey of 55 near-earth asteroids

Hromakina

Birlan

Fulchignoni

et al. 2021

A&A

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Clustering the properties of near-Earth objects: physico-dynamical links among NEOs

Deshapriya¹,

Perna²,

Bott³

et al. 2023

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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.

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A comprehensive study of the opposition effect on 15 NEOs

Ieva

Arcoverde

Rondón

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We report the results we derived analyzing photometric measurements obtained at different phase angles for 15 Near-Earth Objects (NEOs), observed from Campo Imperatore observatory, and Observatório Astronômico do Sertão de Itaparica (OASI). The performed analysis allows us to taxonomically classify them using several independent techniques, thus constraining their surface composition. The majority of this sample is in agreement with a pristine carbonaceous composition (C-complex/D-type asteroids), while few NEOs are composed of more evolved (e.g. S/M/E-type bodies) material. With this work we made evident that a comprehensive characterization of a NEO can be achieved through the coupling of spectrophotometric data and phase curve assessment. This is crucial in case these objects become target of future rendez-vous, sample-return or mitigation missions.

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Extended photometric survey of near-Earth objects

Cited by 8 publications

References 28 publications

Photometric survey of 55 near-earth asteroids

Photometric survey of 55 near-earth asteroids

Clustering the properties of near-Earth objects: physico-dynamical links among NEOs

A comprehensive study of the opposition effect on 15 NEOs

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