Juan A. Sanchez
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View article: Spectral Effects of Shock Darkening on Ordinary Chondrite and Howardite, Eucrite, and Diogenite Meteorites
Spectral Effects of Shock Darkening on Ordinary Chondrite and Howardite, Eucrite, and Diogenite Meteorites Open
Impacts are the most ubiquitous processes on planetary bodies in our solar system. During these impact events, shock waves can deposit enough energy to produce shock-induced darkening in the target material, resulting in an alteration of i…
View article: Long-term Spectral Monitoring of Active Asteroid (6478) Gault: Implications for the H Chondrite Parent Body
Long-term Spectral Monitoring of Active Asteroid (6478) Gault: Implications for the H Chondrite Parent Body Open
Active asteroid (6478) Gault underwent outbursts between late 2018 and early 2019 with tails morphologically similar to the ejecta from Dimorphous following the Double Asteroid Redirection Test impact. Multiple studies investigated the dus…
View article: The Gefion Asteroid Family: parent body puzzles and ordinary chondrite pieces
The Gefion Asteroid Family: parent body puzzles and ordinary chondrite pieces Open
Asteroid families provide critical clues to the nature of their original parent bodies. Ordinary chondrites, the most common meteorites to reach Earth, consist of three subtypes: H, L, and LL chondrites, offering valuable insights into the…
View article: Grain Size Effects on Visible and Near-infrared (0.35–2.5 μm) Laboratory Spectra of Rare Meteorite Classes
Grain Size Effects on Visible and Near-infrared (0.35–2.5 μm) Laboratory Spectra of Rare Meteorite Classes Open
Linking near-Earth asteroids to associated meteorites can be a challenging process for many reasons, one being grain size differences. To address this issue for rarer meteorites, we studied visible and near-infrared (0.35–2.5 μ m) reflecta…
View article: 2023 DZ2 Planetary Defense Campaign
2023 DZ2 Planetary Defense Campaign Open
We present the results of a fourth planetary defense exercise, focused this time on the small near-Earth asteroid (NEA) 2023 DZ2 and conducted during its close approach to the Earth in 2023 March. The International Asteroid Warning Network…
View article: The Population of Small Near-Earth Objects: Composition, Source Regions, and Rotational Properties
The Population of Small Near-Earth Objects: Composition, Source Regions, and Rotational Properties Open
The study of small (<300 m) near-Earth objects (NEOs) is important because they are more closely related than larger objects to the precursors of meteorites that fall on Earth. Collisions of these bodies with Earth are also more frequent. …
View article: Challenges in Identifying Artificial Objects in the Near-Earth Object Population: Spectral Characterization of 2020 SO
Challenges in Identifying Artificial Objects in the Near-Earth Object Population: Spectral Characterization of 2020 SO Open
Since the dawn of the Space Age, hundreds of payloads have been launched into heliocentric space. As near-Earth object (NEO) surveys search deeper for small asteroids, more artificial objects in heliocentric orbits are being discovered. We…
View article: Near-IR Spectral Observations of the Didymos System: Daily Evolution Before and After the DART Impact Indicates that Dimorphos Originated from Didymos
Near-IR Spectral Observations of the Didymos System: Daily Evolution Before and After the DART Impact Indicates that Dimorphos Originated from Didymos Open
Ejecta from Dimorphos following the DART mission impact significantly increased the brightness of the Didymos–Dimorphos system, allowing us to examine subsurface material. We report daily near-IR spectroscopic observations of the Didymos s…
View article: Near-IR Spectral Observations of the Didymos System -- Daily Evolution Before and After the DART Impact, Indicates Dimorphos Originated from Didymos
Near-IR Spectral Observations of the Didymos System -- Daily Evolution Before and After the DART Impact, Indicates Dimorphos Originated from Didymos Open
Ejecta from Dimorphos following the DART mission impact, significantly increased the brightness of the Didymos-Dimorphos system, allowing us to examine sub-surface material. We report daily near-IR spectroscopic observations of the Didymos…
View article: Spectroscopic Links among Giant Planet Irregular Satellites and Trojans
Spectroscopic Links among Giant Planet Irregular Satellites and Trojans Open
We collect near-infrared spectra (∼0.75–2.55 μ m) of four Jovian irregular satellites and visible spectra (∼0.32–1.00 μ m) of two Jovian irregular satellites, two Uranian irregular satellites, and four Neptune Trojans. We find close simila…
View article: Spectroscopic Links Among Giant Planet Irregular Satellites and Trojans
Spectroscopic Links Among Giant Planet Irregular Satellites and Trojans Open
We collect near-infrared spectra ($\sim0.75-2.55\ μm$) of four Jovian irregular satellites and visible spectra ($\sim0.32-1.00\ μm$) of two Jovian irregular satellites, two Uranian irregular satellites, and four Neptune Trojans. We find cl…
View article: Grain Size Effects on UV–MIR (0.2–14 μm) Spectra of Carbonaceous Chondrite Groups
Grain Size Effects on UV–MIR (0.2–14 μm) Spectra of Carbonaceous Chondrite Groups Open
Carbonaceous chondrites are among the most important meteorite types and have played a vital role in deciphering the origin and evolution of our solar system. They have been linked to low-albedo C-type asteroids, but due to subdued absorpt…
View article: Mineralogical Characterization and Phase Angle Study of Two Binary Near-Earth Asteroids, Potential Targets for NASA’s Janus Mission
Mineralogical Characterization and Phase Angle Study of Two Binary Near-Earth Asteroids, Potential Targets for NASA’s Janus Mission Open
Ground-based characterization of spacecraft targets prior to mission operations is critical to properly plan and execute measurements. Understanding surface properties, such as mineralogical composition and phase curves (expected brightnes…
View article: Mineralogical Characterization and Phase Angle Study of Two Binary Near-Earth Asteroids, Potential Targets for NASA's Janus Mission
Mineralogical Characterization and Phase Angle Study of Two Binary Near-Earth Asteroids, Potential Targets for NASA's Janus Mission Open
Ground-based characterization of spacecraft targets prior to mission operations is critical to properly plan and execute measurements. Understanding surface properties, like mineralogical composition and phase curves (expected brightness a…
View article: Grain Size Effects on Visible and Near-infrared (0.35–2.5 μm) Laboratory Spectra of Ordinary Chondrite and HED Meteorites
Grain Size Effects on Visible and Near-infrared (0.35–2.5 μm) Laboratory Spectra of Ordinary Chondrite and HED Meteorites Open
Remote spectral characterization of near-Earth asteroids (NEAs) relies on laboratory spectral calibration to constrain their surface composition, including mineral chemistry and relative mineral abundances. Often these calibrations are bas…
View article: Physical Characterization of Near-Earth Asteroid (52768) 1998 OR2: Evidence of Shock Darkening/Impact Melt
Physical Characterization of Near-Earth Asteroid (52768) 1998 OR2: Evidence of Shock Darkening/Impact Melt Open
We conducted photometric and spectroscopic characterization of near-Earth asteroid (52768) 1998 OR2 during a close approach to Earth in 2020 April. Our photometric measurements confirm the rotation period of the asteroid to be 4.126 ± 0.17…
View article: Near-infrared Spectroscopy of the Nucleus of Low-activity Comet P/2016 BA<sub>14</sub> during Its 2016 Close Approach
Near-infrared Spectroscopy of the Nucleus of Low-activity Comet P/2016 BA<sub>14</sub> during Its 2016 Close Approach Open
The near-Earth comet P/2016 BA 14 (PanSTARRS) is a slow-rotating, nearly dormant object, a likely dynamical twin of 252P/LINEAR, and was recently shown to have a mid-infrared spectrum very dissimilar to other comets. Comet BA 14 was also r…
View article: Physical Characterization of Metal-rich Near-Earth Asteroids 6178 (1986 DA) and 2016 ED85
Physical Characterization of Metal-rich Near-Earth Asteroids 6178 (1986 DA) and 2016 ED85 Open
Metal-rich near-Earth asteroids (NEAs) represent a small fraction of the NEA population that is mostly dominated by S- and C-type asteroids. Because of this, their identification and study provide us with a unique opportunity to learn more…
View article: Physical Characterization of Metal-rich Near-Earth Asteroids 6178 (1986 DA) and 2016 ED85
Physical Characterization of Metal-rich Near-Earth Asteroids 6178 (1986 DA) and 2016 ED85 Open
Metal-rich near-Earth asteroids (NEAs) represent a small fraction of the NEA population that is mostly dominated by S- and C-type asteroids. Because of this, their identification and study provide us with a unique opportunity to learn more…
View article: Investigating the Relationship between (3200) Phaethon and (155140) 2005 UD through Telescopic and Laboratory Studies
Investigating the Relationship between (3200) Phaethon and (155140) 2005 UD through Telescopic and Laboratory Studies Open
The relationship between the near-Earth objects (3200) Phaethon and (155140) 2005 UD is unclear. While both are parents to meteor showers (the Geminids and Daytime Sextantids, respectively) and have similar visible-wavelength reflectance s…
View article: Complex Water-ice Mixtures on NII Nereid: Constraints from NIR Reflectance
Complex Water-ice Mixtures on NII Nereid: Constraints from NIR Reflectance Open
Nereid, Neptune’s third-largest satellite, lies in an irregular orbit and is the only outer satellite in the system (apart from Triton) that can be spectroscopically characterized with the current generation of Earth-based telescopes. We r…
View article: Characterization of Exogenic Boulders on the Near-Earth Asteroid (101955) Bennu from OSIRIS-REx Color Images
Characterization of Exogenic Boulders on the Near-Earth Asteroid (101955) Bennu from OSIRIS-REx Color Images Open
A small number of anomalously bright boulders on the near-Earth rubble-pile asteroid (101955) Bennu were recently identified as eucritic material originating from asteroid (4) Vesta. Building on this discovery, we explored the global prese…
View article: Characterization of Exogenic Boulders on Near-Earth Asteroid (101955)\n Bennu from OSIRIS-REx Color Images
Characterization of Exogenic Boulders on Near-Earth Asteroid (101955)\n Bennu from OSIRIS-REx Color Images Open
A small number of anomalously bright boulders on the near-Earth, rubble-pile\nasteroid (101955) Bennu were recently identified as eucritic material\noriginating from asteroid (4) Vesta. Building on this discovery, we explored\nthe global p…
View article: Mineralogical Criteria for the Parent Asteroid of the “Carbonaceous” Achondrite NWA 6704
Mineralogical Criteria for the Parent Asteroid of the “Carbonaceous” Achondrite NWA 6704 Open
The unique achondrite meteorite Northwest Africa (NWA) 6704 and its paired samples are fragments of an unknown parent asteroid that experienced large-scale igneous melting early in our solar system’s history. The geochemistry and mineralog…
View article: A satellite orbit drift in binary near-Earth asteroids (66391) 1999 KW4 and (88710) 2001 SL9 -- Indication of the BYORP effect
A satellite orbit drift in binary near-Earth asteroids (66391) 1999 KW4 and (88710) 2001 SL9 -- Indication of the BYORP effect Open
We obtained thorough photometric observations of two binary near-Earth asteroids (66391) Moshup = 1999 KW4 and (88710) 2001 SL9 taken from 2000 to 2019 and derived physical and dynamical properties of the binary systems. We found that the …
View article: Search for the H Chondrite Parent Body among the Three Largest S-type Asteroids: (3) Juno, (7) Iris, and (25) Phocaea
Search for the H Chondrite Parent Body among the Three Largest S-type Asteroids: (3) Juno, (7) Iris, and (25) Phocaea Open
Linking meteorites to source regions in the main asteroid belt is important for understanding the conditions under which their parent bodies formed. Ordinary chondrites are the most abundant class of meteorites on Earth, totaling 86% of al…
View article: Physical Characterization of Active Asteroid (6478) Gault
Physical Characterization of Active Asteroid (6478) Gault Open
Main belt asteroid (6478) Gault has been dynamically linked with two overlapping asteroid families: Phocaea, dominated by S-type asteroids, and Tamara, dominated by low-albedo C-types. This object has recently become an interesting case fo…
View article: Microstructural Characterization on AISI H13 Nitrided After a Heat Treatment
Microstructural Characterization on AISI H13 Nitrided After a Heat Treatment Open
View article: Compositional distributions and evolutionary processes for the near-Earth object population: Results from the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS)
Compositional distributions and evolutionary processes for the near-Earth object population: Results from the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS) Open
View article: Rotationally Resolved Spectroscopic Characterization of Near-Earth Object (3200) Phaethon
Rotationally Resolved Spectroscopic Characterization of Near-Earth Object (3200) Phaethon Open
(3200) Phaethon is a compelling object as it has an asteroidal appearance and spectrum, produces a weak dust tail during perihelion at just 0.14 au, and is the parent body of the Geminid Meteor Shower. A better understanding of the physica…