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General
Este Proyecto estudia las propiedades físicas y composicionales de los llamados pequeños cuerpos del Sistema Solar, que incluyen asteroides, objetos helados y cometas. Entre los grupos de mayor interés destacan los objetos trans-neptunianos (TNOs), incluyendo los objetos más lejanos detectados hasta la fecha (Extreme-TNOs o ETNOs); los cometas, y los objetos transicionales cometa-asteroide (Centauros y los llamados Main Belt Comets - MBCs); los asteroides primitivos. Los dos últimos grupos contienen el material más primordial y prístino del Sistema Solar son claves para comprender su origen y evolución. Se destacan entre los asteroides aquellos que se acercan a la órbita de la Tierra (near-Earth asteroids o NEAs), así como los considerados potencialmente peligrosos (Potentially Hazardous Asteroids o PHAs). Debido a su cercanía, los NEAs son los objetos más accesibles al estudio in-situ con misiones espaciales y su futura explotación como fuente de materias primas (asteroid mining). Se destaca el liderazgo por parte del IP del grupo de un survey espectroscópico (visible e infrarrojo cercano) de asteroids primitivos (PRIMitive Asteroid Spectroscopic Survey - PRIMASS). Este proyecto ha recibido financiación de la NASA (17-PDART17_2-0097, IP: N. Pinilla-Alonso, 137.000€ - 2 años) para archivar todos estos espectros (más de 800) en el Small Bodies Node del NASA Planetary Data System.
Los estudios de composición superficial y propiedades físicas y térmicas de estos cuerpos se llevan a cabo utilizando espectroscopia en un amplio rango de longitudes de onda (desde 0.35 a 24 micras), así como imagen y fotometría en el mismo rango. Los datos se interpretan utilizando modelos de scattering y termo-físicos. El proyecto trabaja además en el análisis de las propiedades físicas de los núcleos cometarios y de las propiedades del polvo y el gas en las comas cometarias, muy especialmente en el estudio del polvo en las colas de los MBCs y de los mecanismos por los cuales se emite.
Este grupo mantiene diversas colaboraciones internacionales con otros grupos entre las que podemos destacar: (1) la pertenencia al Grupo de Ciencia de la misión de NASA OSIRIS-REx, en concreto al "Image Processing Working Group", en donde se encarga del tratamiento de los mapas de color que se están obteniendo actualmente con las cámaras OCAMS; (2) la pertenencia al núcleo central de proponentes de las misiones M5 de ESA CASTALIA, CASTAway y Hera; (3) la coordinación de un grupo internacional de estudio de NEAs llamado EURONEAR (European Near Earth Asteroid Research); (4) la pertenencia al "Center for Lunar and Asteroid Surface Science" (CLASS, NASA); (5) la integración en el grupo de Sistema Solar de la misión Euclid; (6) la participación activa en los surveys J-PLUS y J-PASS, en los que trabaja en la explotación de las observaciones de objetos del Sistema Solar; (7) la pertenencia a los grupos de trabajo de Sistema Solar de los telescopios Gaia y JWST.
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Actividad científica
Publicaciones relacionadas
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Particle size distributions inside and around the artificial crater produced by the Hayabusa2 impact experiment on RyuguJapanese Hayabusa2 spacecraft has successfully carried out an impact experiment using a small carry-on impactor (SCI) on an asteroid (162173) Ryugu. We examine the size distribution of particles inside and outside an artificial impact crater (the SCI crater) based on the images taken by the optical navigation camera onboard the Hayabusa2 spacecraftOgawa, K. et al.
Fecha de publicación:
122022 -
A pristine record of outer Solar System materials from asteroid Ryugu's returned sampleVolatile and organic-rich C-type asteroids may have been one of the main sources of Earth's water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only the strongest types survive atmospheric entry and are then modified by interaction with the terrestrialIto, Motoo et al.
Fecha de publicación:
82022 -
Spectral Rotational Characterization of the Didymos System prior to the DART ImpactThe smallest member of the Didymos binary near-Earth object system (Dimorphos) is the target of the DART/LICIACube mission, the first attempt to change the orbit of another celestial body via a kinetic impactor. It is important to characterize the unperturbed system prior to the DART impact. In this work we obtained, for the first time, spectralIeva, Simone et al.
Fecha de publicación:
82022 -
Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex familiesContext. Spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (NUV) reflectance spectra. Reflectance spectra at NUV wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. However, the NUV wavelength region hasTatsumi, E. et al.
Fecha de publicación:
82022 -
Photometric Observations of the Binary Near-Earth Asteroid (65803) Didymos in 2015-2021 Prior to DART ImpactWe performed photometric observations of the binary near-Earth asteroid (65803) Didymos in support of the Double Asteroid Redirection Test (DART) mission that will test the Kinetic Impactor technology for diverting dangerous asteroids. It will hit the Didymos secondary, called Dimorphos, on 2022 September 26. We observed Didymos with 11 telescopesPravec, P. et al.
Fecha de publicación:
72022 -
The EURONEAR Lightcurve Survey of Near Earth Asteroids 2017-2020This is the fourth data paper publishing lightcurve survey work of 52 Near Earth Asteroids (NEAs) using 10 telescopes available to the EURONEAR network between 2017 and 2020. Forty six targets were not observed before our runs (88% of the sample) but some of these were targeted during the same oppositions mainly by Brian Warner. We propose newVaduvescu, O. et al.
Fecha de publicación:
102022 -
Apophis Planetary Defense CampaignWe describe results of a planetary defense exercise conducted during the close approach to Earth by the near-Earth asteroid (99942) Apophis during 2020 December-2021 March. The planetary defense community has been conducting observational campaigns since 2017 to test the operational readiness of the global planetary defense capabilities. TheseReddy, Vishnu et al.
Fecha de publicación:
52022 -
A comprehensive study of the opposition effect on 15 NEOsWe 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, thusIeva, S. et al.
Fecha de publicación:
62022 -
Three-axial shape distributions of pebbles, cobbles and boulders smaller than a few meters on asteroid RyuguOver a broad size range, the shapes of impact fragments from catastrophic disruptions are distributed around the mean axial ratio 2: √2: 1, irrespective of experimental conditions and target materials. Although most blocks on asteroids are likely to be impact fragments, there is not enough quantitative data for reliable statistics on their threeMichikami, Tatsuhiro et al.
Fecha de publicación:
72022 -
Physical and dynamical characterization of hyperbolic comet C/2017 U7 (PANSTARRS)We present here a dynamical and observational study of the comet C/2017 U7 (PANSTARRS). This comet was discovered in 2017 and found to have a hyperbolic orbit. Our dynamical analysis shows that the object has probably originated in the Oort cloud, however an interstellar origin cannot be discarded. The observations were obtained in 2018 and 2019Evangelista-Santana, M. et al.
Fecha de publicación:
52022 -
Spectroscopic study of Ceres' collisional family candidatesContext. Despite the observed signs of large impacts on the surface of Ceres, there is no confirmed collisional family associated with this dwarf planet. After a dynamical and photometric study, a sample of 156 asteroids were proposed as candidate members of a Ceres collisional family. Aims: Our main objective is to study the connection betweenTinaut-Ruano, F. et al.
Fecha de publicación:
22022 -
Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent bodyPlanetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts 1,2, and subsequent thermal and compaction processes reduce their porosity 3. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30-50% (refs. 4-6), higherSakatani, N. et al.
Fecha de publicación:
52021 -
J-PLUS: A first glimpse at the spectrophotometry of asteroids. The MOOJa catalogContext. The Javalambre Photometric Local Universe Survey (J-PLUS) is an observational campaign that aims to obtain photometry in 12 ultraviolet-visible filters (0.3−1 μm) over ∼8500 deg 2 of the sky observable from Javalambre (Teruel, Spain). Due to its characteristics and observation strategy, this survey will allow a great number of Solar SystemMorate, David et al.
Fecha de publicación:
112021 -
Properties of slowly rotating asteroids from the Convex Inversion Thermophysical ModelContext. Recent results for asteroid rotation periods from the TESS mission showed how strongly previous studies have underestimated the number of slow rotators, revealing the importance of studying those targets. For most slowly rotating asteroids (those with P > 12 h), no spin and shape model is available because of observation selection effectsMarciniak, A. et al.
Fecha de publicación:
102021 -
Spectrally blue hydrated parent body of asteroid (162173) RyuguRyugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger parent bodies. However, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristine material from the parentTatsumi, Eri et al.
Fecha de publicación:
102021 -
Widely distributed exogenic materials of varying compositions and morphologies on asteroid (101955) BennuUsing the multiband imager MapCam on board the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) spacecraft, we identified 77 instances of proposed exogenic materials distributed globally on the surface of the B-type asteroid (101955) Bennu. We identified materials as exogenic on the basis of anTatsumi, Eri et al.
Fecha de publicación:
122021 -
Spectral properties of near-Earth objects with low-Jovian Tisserand invariantThe near-Earth objects with low-Jovian Tisserand invariant (T J) represent about 9 per cent of the known objects orbiting in the near-Earth space, being subject of numerous planetary encounters and large temperature variations. We aim to make a spectral characterization for a large sample of NEOs with T J ≤ 3.1. Consequently, we can estimate theSimion, N. G. et al.
Fecha de publicación:
112021 -
Opposition Observations of 162173 Ryugu: Normal Albedo Map Highlights Variations in Regolith CharacteristicsOn 2019 January 8, the Telescopic Optical Navigation Camera (ONC-T) on board the Hayabusa2 spacecraft observed the Cb-type asteroid 162173 Ryugu under near-opposition illumination and viewing conditions from approximately 20 km in distance. Although opposition observations have never been used for mapping purposes of a planetary body, we foundYokota, Yasuhiro et al.
Fecha de publicación:
102021 -
High-resolution observations of bright boulders on asteroid Ryugu: 2. Spectral propertiesMany small boulders with reflectance values higher than 1.5 times the average reflectance have been found on the near-Earth asteroid 162,173 Ryugu. Based on their visible wavelength spectral differences, Tatsumi et al. (2021, Nature Astronomy, 5, doi:10.1038/s41550-020-1179-z) defined two bright boulder classes: C-type and S-type. These twoSugimoto, Chiho et al.
Fecha de publicación:
112021 -
Spectrophotometric Properties of 162173 Ryugu's Surface from the NIRS3 Opposition ObservationsExamination of the opposition geometry properties show that Ryugu's surface regolith is commensurate with laboratory studies of the photometric behavior of powdered carbonaceous chondrites. The regolith is consistent with a broad grain size distribution that contains a fine-grained component.Domingue, Deborah et al.
Fecha de publicación:
102021
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El Gran Telescopio Canarias obtiene un espectro del primer cometa interestelar C/2019 Q4 (Borisov)Fecha de publicación
