PRIMASS visits Hilda and Cybele groups

Pra, Mario Nascimento De; Pinilla-Alonso, N.; Carvano, J. M.; Licandro, J.; Campins, H.; Mothé-Diniz, T.; León, J. de; Alí-Lagoa, V.

doi:10.1016/j.icarus.2017.11.012

Cited by 28 publications

(24 citation statements)

References 55 publications

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“…These similarities suggest that the JTs also have a primitive nature, having under- gone little to no thermal alteration since their formation. Further investigations revealed a bimodality in their color distribution both in visible and NIR wavelengths, with one "red" peak related to the D-types, and one less red peak, similar to P-types (Emery et al, 2010;Wong et al, 2014;De Prá et al, 2018). This bimodality has been interpreted as the predominance of two intrinsically different compositional groups.…”

Section: Introductionmentioning

confidence: 91%

“…Vilas (1995) suggested that it could be related to hydrated materials in the surface of the asteroid. We characterized the turnover region following the methodology described in De Prá et al (2018); the turn-off point was measured by calculating the furthest point from a linear fit considering just the edges of the spectrum. In addition to the turn-off wavelength, we also measured the slope of the drop-off in reflectance on wavelengths lower than the turn-off point (near-UV slope).…”

Section: Donaldjohansonmentioning

confidence: 99%

See 1 more Smart Citation

Analysis in the visible range of NASA Lucy mission targets: Eurybates, Polymele, Orus and Donaldjohanson.

Prá

Pinilla-Alonso

Álvarez-Candal

et al. 2020

Icarus

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Jupiter Trojan asteroids are minor bodies that share Jupiter's orbit around the Sun.Although not yet well understood in origin and composition, they have surface properties that, besides being comparable with other populations of small bodies in the Solar System, hold information that may restrict models of planetary formation. Due their importance, there has been a significant increase in an interest in studying this population. In this context arises the NASA Lucy Mission, with a planned launch of 2021. The Lucy Mission will be the first one to address a group of 6 objects (five Jupiter Trojan and one main belt asteroid) with the aim of investigating, in detail, their nature. In order to provide valuable information for mission planning and maximize the scientific return, we carried out ground based observations of four targets of the mission. Aimed at looking for variabilities on the spectra of (3548) Eurybates, (15094) Polymele and (21900) Orus, we performed rotationally resolved visible spectroscopy of them at SOAR Telescope. We also analyzed the first visible spectrum obtained for the main belt asteroid (52246) Donaldjohanson at Gran Telescopio Canarias. The spectra of (21900) Orus and (15094) Polymele present rather homogeneous characteristics along the surfaces, and their taxa correspond with those of the two dominant populations in the Trojan population, the P-and the D-type group of objects. Spectroscopy of (3548) Eurybates, on the other side, suggests that some variation on the characteristics of the reflectance of this body could be related with its collisional history. Donaldjohanson, the only main belt object in the group of targets, shows, according to our visible spectrum, hints of the presence of hydrated materials. Lucy mission will investigate the surface composition of these targets and will shed light on their connections with other minor bodies populations and in their role on the evolution of the Solar System.

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Section: Introductionmentioning

confidence: 91%

Section: Donaldjohansonmentioning

confidence: 99%

Analysis in the visible range of NASA Lucy mission targets: Eurybates, Polymele, Orus and Donaldjohanson.

Prá

Pinilla-Alonso

Álvarez-Candal

et al. 2020

Icarus

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“…A common feature observed in several of these objects across the asteroid belt is the 0.7 µm absorption band, characteristic of hydrated minerals (Vilas 1994;Carvano et al 2003;Fornasier et al 2014). The number of objects presenting this feature peaks at the central belt and decreases at the Cybele region, delimiting the hydration zone (Rivkin 2012;Fornasier et al 2014;De Prá et al 2018). As part of the PRIMitive asteroid spectroscopic survey (PRIMASS), we studied the visible spectroscopy of eight primitive asteroids families in the inner belt and identified a mix of anhydrous and hydrated families in that region, where the percentage of hydrated members in a family can reach nearly 80% (de León et al 2016;Morate et al 2016Morate et al , 2018Morate et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of the outer-belt primitive families

Pra

Pinilla-Alonso

Carvano

et al. 2020

A&A

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Context. Asteroid families are witnesses to the intense collisional evolution that occurred on the asteroid belt. The study of the physical properties of family members can provide important information about the state of differentiation of the parent body and provide insights into how these objects were formed. Several of these asteroid families identified across the main belt are dominated by low-albedo, primitive asteroids. These objects are important for the study of Solar System formation because they were subject to weaker thermophysical processing and provide information about the early conditions of our planetary system. Aims. We aim to study the diversity of physical properties among the Themis, Hygiea, Ursula, Veritas, and Lixiaohua families. Methods. We present new spectroscopic data, combined with a comprehensive analysis using a variety of data available in the literature, such as albedo and rotational properties. Results. Our results show that Themis and Hygiea families, the largest families in the region, present similar levels of hydration. Ursula and Lixiaohua families are redder in comparison to the others and present no sign of hydrated members based on the analysis of visible spectra. Conversely, Veritas presents the highest fraction of hydrated members. Conclusions. This work demonstrates a diverse scenario in terms of the physical properties of primitive outer-belt families, which could be associated with dynamical mixing of asteroid populations and the level of differentiation of the parental body.

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“…We are confirming, using near-infrared photometry combined with NEOWISE and SDSS data, some results already known for several families. Vesta shows a small contamination of rocky and primitive asteroids (Licandro et al 2017); Nysa-Polana presents a bimodality in its composition corresponding to the presence of two families (Cellino et al 2001;Walsh et al 2013;Milani et al 2014;Dykhuis & Greenberg 2015); Eos is the only K-type family identified in the inner belt (Mothé-Diniz et al 2005; and Hilda shows some bimodality inside the primitive region (De Prá et al 2018). In addition, we found relevant results in our analysis related to the Ino and Baptistina families.…”

Section: Discussionmentioning

confidence: 99%

“…In the case of the Hilda family, located within the Hilda dynamical group, the combination that minimizes the KS-test results is a 36-64% of P1-P2 populations. De Prá et al (2018) reported a primitive surface composition with a bimodal distribution. This is in agreement with our results.…”

Section: Some Primitive Familiesmentioning

confidence: 99%

Color study of asteroid families within the MOVIS catalog

Morate

Licandro

Popescu

et al. 2018

A&A

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The aim of this work is to study the compositional diversity of asteroid families based on their near-infrared colors, using the data within the MOVIS catalog. As of 2017, this catalog presents data for 53 436 asteroids observed in at least two near-infrared filters (Y, J, H, or Ks). Among these asteroids, we find information for 6299 belonging to collisional families with both Y −J and J−Ks colors defined. The work presented here complements the data from SDSS and NEOWISE, and allows a detailed description of the overall composition of asteroid families. We derived a near-infrared parameter, the ML*, that allows us to distinguish between four generic compositions: two different primitive groups (P1 and P2), a rocky population, and basaltic asteroids. We conducted statistical tests comparing the families in the MOVIS catalog with the theoretical distributions derived from our ML* in order to classify them according to the above-mentioned groups. We also studied the background populations in order to check how similar they are to their associated families. Finally, we used this parameter in combination with NEOWISE and SDSS to check for possible bimodalities in the data. We found 43 families with ML*err < 0.071 and with at least 8 asteroids observed: 5 classified as P1, 10 classified as P2, 19 families associated with the rocky population, and 9 families that were not linked to any of the previous populations. In these cases, we compared our samples with different combinations of these theoretical distributions to find the one that best fits the family data. We also show, using the data from MOVIS and NEOWISE, that the Bapistina family presents a two-cluster distribution in the near-infrared albedo vs. ML* parameter space that might be related to a common differentiated parent body. Finally, we show that the backgrounds we defined seem to be linked to their associated families.

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PRIMASS visits Hilda and Cybele groups

Cited by 28 publications

References 55 publications

Analysis in the visible range of NASA Lucy mission targets: Eurybates, Polymele, Orus and Donaldjohanson.

Analysis in the visible range of NASA Lucy mission targets: Eurybates, Polymele, Orus and Donaldjohanson.

A comparative analysis of the outer-belt primitive families

Color study of asteroid families within the MOVIS catalog

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