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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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Characterisation of the new target of the NASA Lucy mission: Asteroid 152830 Dinkinesh (1999 VD57)Context. The NASA Lucy mission is designed to collect data that will be used to study the very interesting population of Jupiter Trojans, which are considered to be time capsules from the time of birth of our Solar System. During its journey, the mission will pass near a main belt asteroid, Donaldjohanson. Recently, NASA announced that a newde León, J. et al.
Fecha de publicación:
42023 -
Near-ultraviolet absorption distribution of primitive asteroids from spectrophotometric surveys. I. Radial distributionContext. Hydrated minerals, such as phyllosilicates, on asteroids can provide constraints on the temperature or compositional distribution of the early Solar System. Previous studies pointed out the possibility that absorption in the near-ultraviolet (NUV, 0.35-0.5 μm) wavelength region is a proxy for hydrated minerals in primitive asteroidsTatsumi, E. et al.
Fecha de publicación:
42023 -
Morphology and spectral properties of the DART impact ejecta with VLT/MUSEContext. On September 26, 2022, the NASA DART mission impacted the asteroid Dimorphos, the smaller component of the Didymos binary asteroid system. This provided a unique opportunity to observe, in real time, the evolution of the ejecta cloud produced by the impact and the formation of a tail. Aims: We present observations performed with the MUSEOpitom, C. et al.
Fecha de publicación:
32023 -
A dehydrated space-weathered skin cloaking the hydrated interior of RyuguWithout a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratoryNoguchi, Takaaki et al.
Fecha de publicación:
22023 -
A Candidate Location for Planet Nine from an Interstellar Meteoroid: The Messenger HypothesisThe existence of a hypothetical Planet Nine lurking in the outer solar system has been invoked as a plausible explanation for the anomalous clustering in the orbits of trans-Neptunian objects. Here we propose that some meteoroids arriving at Earth could serve as messengers with the potential of revealing the presence of a hitherto undiscoveredSocas-Navarro, Hector
Fecha de publicación:
32023 -
Mini-moons from horseshoes: A physical characterization of 2022 NX<SUB>1</SUB> with OSIRIS at the 10.4 m Gran Telescopio CanariasContext. The near-Earth orbital space is shared by natural objects and space debris that can be temporarily captured in geocentric orbits. Short-term natural satellites are often called mini-moons. Reflectance spectroscopy can determine the true nature of transient satellites because the spectral signatures of spacecraft materials and near-Earthde la Fuente Marcos, R. et al.
Fecha de publicación:
22023 -
Asteroids' reflectance from Gaia DR3: Artificial reddening at near-UV wavelengthsContext. Observational and instrumental difficulties observing small bodies below 0.5 μm make this wavelength range poorly studied compared with the visible and near-infrared. Furthermore, the suitability of many commonly used solar analogues, essential in the computation of asteroid reflectances, is usually assessed only in visible wavelengthsTinaut-Ruano, F. et al.
Fecha de publicación:
12023 -
First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from RyuguThe Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas consists of helium and neon with an extraterrestrial 3He/4He and 20Ne/22Ne ratiosOkazaki R. et al et al.
Fecha de publicación:
112022 -
A dehydrated space-weathered skin cloaking the hydrated interior of RyuguWithout a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory
Fecha de publicación:
122022 -
Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteoritesCarbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measure the mineralogy, bulk chemical and isotopic compositions of Ryugu samples. They are mainly composed of materials similar to carbonaceous chondrite meteoritesYokoyama, T. et al.
Fecha de publicación:
32023 -
Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samplesSamples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed seventeen Ryugu samples measuring 1-8 mm. CO2-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu’s parent asteroid formed in the outer Solar System. The samples contain low abundances of materials thatNakamura T. et al. et al.
Fecha de publicación:
32023 -
Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolutionThe near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth’s volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measure noble gas and nitrogen isotopes in Ryugu samples, finding they are dominated by pre-solar and primordialOkazaki R. et al et al.
Fecha de publicación:
102022 -
Mineralogical analysis of 14 PHAs from ViNOS dataPotentially hazardous asteroids (PHAs) are objects that can have close encounters with Earth and are significantly large to cause significant regional damage in the event of impact. The mitigation strategy requires to understand their physical properties. We aim to investigate the physical nature of PHAs, using data obtained within the framework ofMorate, D. et al.
Fecha de publicación:
22023 -
Lightcurve analysis of near-Earth objects from the IMPACTON project: Evidence of binary systems and cohesion strengthRotations of asteroids have been set and altered by several processes since their formation. In the case of the near-Earth objects (NEOs), the rotational states are significantly affected by non-gravitational effects. In addition, an abundant population of binary systems has been found among NEOs with rotational periods very close to the spinMonteiro, Filipe et al.
Fecha de publicación:
12023 -
A targeted search for Main Belt CometsMain Belt Comets (MBCs) exhibit sublimation-driven activity while occupying asteroid-like orbits in the Main Asteroid Belt. MBCs and candidates show stronger clustering of their longitudes of perihelion around 15° than other objects from the Outer Main Belt (OMB). This potential property of MBCs could facilitate the discovery of new candidates byFerellec, Léa et al.
Fecha de publicación:
12023 -
Site selection for the Hayabusa2 artificial cratering and subsurface material sampling on RyuguHayabusa2 took on the challenge of collecting fresh subsurface samples from asteroid (162173) Ryugu during its second touchdown operation. For this ambitious goal, the spacecraft conducted artificial cratering by using a small carry-on impactor (SCI), leading to the exposure of subsurface materials. The key to mission success lies in the targetKikuchi, Shota et al.
Fecha de publicación:
92022 -
Resurfacing processes constrained by crater distribution on RyuguUnderstanding the geological modification processes on asteroids is fundamental for elucidating their surface evolution. Images of small asteroids from spacecrafts show a depletion in smaller craters. Seismic shaking was considered to be responsible for erasing such small craters and the main driver modifying the geology of asteroids. However, aTakaki, Naofumi et al.
Fecha de publicación:
52022 -
Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to EarthThe Hayabusa2 spacecraft investigated the C-type (carbonaceous) asteroid (162173) Ryugu. The mission performed two landing operations to collect samples of surface and subsurface material, the latter exposed by an artificial impact. We present images of the second touchdown site, finding that ejecta from the impact crater was present at the sampleWatanabe, S. et al.
Fecha de publicación:
32022 -
Detection of the Irregular Shape of the Southern Limb of Menoetius from Observations of the 2017-2018 Patroclus-Menoetius Mutual EventsThis work presents the analysis of seven mutual events of the Patroclus-Menoetius system (PMS) observed during the last season of mutual events, in 2017-2018. We compare the obtained light curves with those predicted using Grundy et al. and discuss the differences in the timing of the events and the drop of magnitude. Based on models of thesePinilla-Alonso, Noemí et al.
Fecha de publicación:
122022 -
Characterization of the MASCOT landing area by Hayabusa2Context. After landing on C-type asteroid Ryugu, MASCOT imaged brightly colored, submillimeter-sized inclusions in a small rock. Hayabusa2 successfully returned a sample of small particles from the surface of Ryugu, but none of these appear to harbor such inclusions. The samples are considered representative of Ryugu. Aims: To understand theSchröder, Stefan et al.
Fecha de publicación:
102022
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Avanzan en el conocimiento del cinturón de asteroides cercano a la Tierra, los ArjunaFecha de publicación -
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Descubren material exógeno en la superficie de los asteroides Ryugu y BennuFecha de publicación
