Explanipedia

Rotationally-Resolved Radar Scattering Properties of Near-Earth Asteroid (433) Eros Open

Y. R. Fernández, Mary Hinkle, E. S. Howell, C. Magri, M. C. Nolan , et al. · 2025

Studies of the regolith of near-Earth asteroids (NEAs) can give us insight into the evolutionary processes that affect these bodies. The regolith’s physical, mechanical, thermal, and scattering properties can tell us about, e.g., the aster…

Findings and Recommendations of the Apophis T-4 Years Workshop "Knowledge Opportunity for the Science of Planetary Defense" Open

Richard P. Binzel, Patrick Michel, Seiji Sugita, Brent W. Barbee, J. de León , et al. · 2025

The solar system small bodies community, having a dedicated interest in the planetary defense science opportunity presented by the exceedingly rare natural event of the large (340-meter) asteroid Apophis safely passing within 32,000 km of …

Combining thermal and radar observations of near-Earth asteroids Open

E. S. Howell, Ronald J. Vervack, M. C. Nolan, C. Magri, Y. R. Fernández , et al. · 2025

We use multiple observations of NEAs to constrain thermophysical models, probe the thermal inertia, and determine sizes from albedos. We examine a variety of NEAs observed at the NASA Infrared Telescope Facility (IRTF) using SpeX [1] in th…

OSIRIS-APEX: NASA's Apophis Explorer Mission Open

M. C. Nolan, D. N. DellaGiustina, Anjani T. Polit, D. R. Golish, Michael C. Moreau , et al. · 2025

Introduction: NASA’s Origins, Spectral Interpretation, Resource Identification, and Security– Regolith Explorer (OSIRIS–REx) mission characterized and collected a sample from asteroid (101955) Bennu [1,2]. Twenty minutes after releasing it…

Author Correction: The geology and evolution of the Near-Earth binary asteroid system (65803) Didymos Open

O. S. Barnouin, Ronald‐Louis Ballouz, S. Marchi, Jean‐Baptiste Vincent, Harrison Agrusa , et al. · 2024

Barnouin, Olivier S. et al.-- Full list of authors: Barnouin, Olivier; Ballouz, Ronald-Louis; Marchi, Simone; Vincent, Jean-Baptiste; Agrusa, Harrison; Zhang, Yun; Ernst, Carolyn M.; Pajola, Maurizio; Tusberti, Filippo; Lucchetti, Alice; D…

Radar Circular Polarization Ratio of Near-Earth Asteroids: Links to Spectral Taxonomy and Surface Processes Open

E. G. Rivera‐Valentín, Betzaida Aponte-Hernández, Patrick Taylor, M. C. Nolan, E. S. Howell , et al. · 2024

The radar circular polarization ratio (CPR) is an indicator of near-surface, wavelength-scale complexity. Interestingly, previous surveys also noted an association between near-Earth asteroid (NEA) disk-integrated CPR and spectral taxonomi…

Physical and Mutual Orbit Characteristics of Near-Earth Binary Asteroid (163693) Atira Open

Aaron Deleon, S. Marshall, Tracy M. Becker, Petr Pravec, E. S. Howell , et al. · 2024

We report physical and mutual orbit characteristics of near-Earth binary asteroid (163693) Atira. Using S -band (2380 MHz, 12.6 cm) radar observations from the Arecibo Observatory and several epochs of lightcurve observations from 2003 to …

The geology and evolution of the Near-Earth binary asteroid system (65803) Didymos Open

O. S. Barnouin, Ronald‐Louis Ballouz, S. Marchi, Jean‐Baptiste Vincent, Harrison Agrusa , et al. · 2024

Numerical simulations suggest asteroids (101955) Bennu and (162173) Ryugu are likely second or later generation rubble piles Open

K. J. Walsh, Ronald‐Louis Ballouz, W. F. Bottke, Chrysa Avdellidou, H. C. Connolly , et al. · 2024

Rocks with Extremely Low Thermal Inertia at the OSIRIS-REx Sample Site on Asteroid Bennu Open

A. J. Ryan, B. Rozitis, Daniel Pino Muñoz, K. J. Becker, Joshua P. Emery , et al. · 2024

The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission recently returned a sample of rocks and dust collected from asteroid Bennu. We analyzed the highest-resolution thermal data …

Supplemental Data for Bennu Particle Photometry Analysis Open

C. W. Hergenrother, C. Maleszewski, Steven R. Chesley, Jian‐Yang Li, John Pelgrift , et al. · 2024

This dataset supports the journal article titles "Photometry of particles ejected from active asteroid (101955) Bennu".

Planetary Radar—State-of-the-Art Review Open

Anne Virkki, C. D. Neish, E. G. Rivera‐Valentín, S. S. Bhiravarasu, Dylan Hickson , et al. · 2023

Planetary radar observations have provided invaluable information on the solar system through both ground-based and space-based observations. In this overview article, we summarize how radar observations have contributed in planetary scien…

OSIRIS-APEX: An OSIRIS-REx Extended Mission to Asteroid Apophis Open

D. N. DellaGiustina, M. C. Nolan, Anjani T. Polit, Michael C. Moreau, D. R. Golish , et al. · 2023

The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) spacecraft mission characterized and collected a sample from asteroid (101955) Bennu. After the OSIRIS-REx Sample Return Capsule rel…

The Next Generation Arecibo Telescope (NGAT) Open

D. Anish Roshi, Nestor Apnote, E. D. Araya, Héctor G. Arce, Lisa‐Jane Baker , et al. · 2023

Whitepaper #344 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: other basic research; ground-based missions/projects; …

Successful kinetic impact into an asteroid for planetary defence Open

R. T. Daly, C. M. Ernst, O. S. Barnouin, N. L. Chabot, A. S. Rivkin , et al. · 2023

Pioneers in Human Anatomy Open

M. C. Nolan, John Mcnamara · 2023

Pioneers in Human Anatomy provides an opportunity for those who may be interested in those pioneers in anatomy or who may have learned (or forgotten) some eponymonic descriptions in the past, to test their knowledge (or memor…

Applied Human Neuroanatomy Open

M. C. Nolan, John M. McNamara · 2022

This 155-page manual is comprised of two types of learning activities:\n1. Free response fill-in-the blank questions focused of the facts and principles of neuroanatomy and neurophysiology that underpin the neurologic examination an…

Applied Human Anatomy Open

M. C. Nolan, John M. McNamara · 2022

The structure of the human body is usually considered in courses in gross anatomy. These courses typically consist of lectures by the faculty, readings in assigned textbooks and the study of photographs and illustrations in human anatomy a…

Arecibo Planetary Radar Observations of Near-Earth Asteroids: 2017 December–2019 December Open

Anne Virkki, S. Marshall, Flaviane Venditti, Luisa Fernanda Zambrano-Marin, Dylan Hickson , et al. · 2022

We successfully observed 191 near-Earth asteroids using the Arecibo Observatory’s S-band planetary radar system from 2017 December through 2019 December. We present radar cross sections for 167 asteroids; circular-polarization ratios for 1…

Shape Modeling of Dimorphos for the Double Asteroid Redirection Test (DART) Open

R. T. Daly, C. M. Ernst, O. S. Barnouin, R. W. Gaskell, E. E. Palmer , et al. · 2022

The Double Asteroid Redirection Test (DART) is the first planetary defense test mission. It will demonstrate the kinetic impactor technique by intentionally colliding the DART spacecraft with the near-Earth asteroid Dimorphos. The main DAR…

Human Anatomy Self-Assessment Review Questions Open

M. C. Nolan, John M. McNamara · 2022

Human anatomy is one of the foundational disciplines in the training of health care professionals. Knowledge of human structure at both the macroscopic and microscopic levels serves as a framework for the study of normal function and dysfu…

Near-zero cohesion and loose packing of Bennu’s near subsurface revealed by spacecraft contact Open

K. J. Walsh, Ronald‐Louis Ballouz, E. R. Jawin, Chrysa Avdellidou, O. S. Barnouin , et al. · 2022

When the OSIRIS-REx spacecraft pressed its sample collection mechanism into the surface of Bennu, it provided a direct test of the poorly understood near-subsurface physical properties of rubble-pile asteroids, which consist of rock fragme…

High‐Resolution Thermophysical Analysis of the OSIRIS‐REx Sample Site and Three Other Regions of Interest on Bennu Open

B. Rozitis, A. J. Ryan, Joshua P. Emery, M. C. Nolan, Simon Green , et al. · 2022

The OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) spacecraft sampled asteroid (101955) Bennu on 20 October 2020 and will return the collected regolith to Earth in 2023. Before sample…

Assessing the Sampleability of Bennu’s Surface for the OSIRIS-REx Asteroid Sample Return Mission Open

K. J. Walsh, E. B. Bierhaus, D. S. Lauretta, M. C. Nolan, Ronald‐Louis Ballouz , et al. · 2022

Geologic Context of the OSIRIS-REx Sample Site from High-resolution Topography and Imaging Open

O. S. Barnouin, E. R. Jawin, R. T. Daly, Ronald‐Louis Ballouz, M. G. Daly , et al. · 2022

The OSIRIS-REx spacecraft collected a surface sample from Hokioi crater (55.8° N, 42.3° E; diameter ∼20 m) on the asteroid Bennu in 2020 October. We explore the geology of the sample collection site, known as Nightingale, by using digital …

The Formation of Terraces on Asteroid (101955) Bennu Open

O. S. Barnouin, M. G. Daly, J. A. Seabrook, Y. Zhang, Florian Thuillet , et al. · 2022

The surface of the rubble‐pile asteroid (101955) Bennu has been characterized in detail by the OSIRIS‐REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission. By examining global and local di…

Global geologic map of asteroid (101955) Bennu indicates heterogeneous resurfacing in the past 500,000 years Open

E. R. Jawin, T. J. McCoy, K. J. Walsh, H. C. Connolly, Ronald‐Louis Ballouz , et al. · 2022

Global geologic maps are useful tools for efficient interpretation of a planetary body, and they provide global context for the diversity and evolution of the surface. We used data acquired by the OSIRIS-REx spacecraft to create the first …

Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits Open

E. G. Rivera‐Valentín, Heather Meyer, Patrick Taylor, E. Mazarico, S. S. Bhiravarasu , et al. · 2022

Ground-based planetary radar observations first revealed deposits of potentially nearly pure water ice in some permanently shadowed regions (PSRs) on Mercury’s poles. Later, the MESSENGER spacecraft confirmed the icy nature of the deposits…

OSIRIS-REx Extended Mission Trajectory Design & Target Search Open

Brian Sutter, Noble Hatten, Kenneth M. Getzandanner, Kyle Hughes, Daniel R. Wibben , et al. · 2022

After jettisoning its Sample Return Capsule (SRC) containing regolith samples from the near-Earth asteroid (101955) Bennu to Earth in September 2023, the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Expl…

Locations of mapped craters on Bennu Open

E. R. Jawin, T. J. McCoy, K. J. Walsh, H. C. Connolly, Ronald‐Louis Ballouz , et al. · 2022

Central coordinates for all mapped craters on Bennu larger than 10 m in diameter.

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