A5072014983- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Space exploration and regulation
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Science, Technology, and Education in Latin America
- Geological and Geochemical Analysis
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
- Advanced Measurement and Metrology Techniques
- Space Science and Extraterrestrial Life
- Biomedical and Engineering Education
- Earthquake Detection and Analysis
- Optical measurement and interference techniques
- Astrophysics and Star Formation Studies
Lunar and Planetary Institute
2018-2022
Universities Space Research Association
2019-2022
Abstract We successfully observed 191 near-Earth asteroids using the Arecibo Observatory’s S-band planetary radar system from 2017 December through 2019 December. present cross sections for 167 asteroids; circular-polarization ratios 112 based on Doppler-echo-power spectra measurements; and albedos, constraints size spin periods, surface-feature shape evaluation 37 selected delay-Doppler images with a range resolution of 75 m or finer. Out 33 an estimated effective diameter at least 200...
Abstract The radar circular polarization ratio (CPR) is an indicator of near-surface, wavelength-scale complexity. Interestingly, previous surveys also noted association between near-Earth asteroid (NEA) disk-integrated CPR and spectral taxonomic class, potentially reflecting differences in regolith mechanical properties and/or surface histories. Here, using Arecibo S -band measurements, we revisit this relationship, as well associations with orbital physical parameters, to test the impact...
Abstract 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 several epochs lightcurve 2003 to 2019 with SHAPE modeling software, we determine shape, size, rotational period, primary secondary components density component. confirm primary’s sidereal rotation period be 3.398521 ± 0.000003 hr, find a likely spin axis orientation ecliptic longitude latitude (187°,...
Context. The potentially hazardous asteroid (85990) 1999 JV6 has been a target of previously published thermal-infrared observations and optical photometry. It identified as promising candidate for possible Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) effect detection. Aims. YORP is small thermal-radiation torque considered to be key factor in spin-state evolution Solar System bodies. In order detect on we developed detailed shape model analysed the using both radar observations. Methods....
Abstract We report observations of the Apollo-class potentially hazardous asteroid 1981 Midas, which passed 0.090 au from Earth (35 lunar distances) on 2018 March 21. During this close approach, Midas was observed by radar both Arecibo Observatory 21 through 25 (five nights) and NASA’s Goldstone Deep Space Communications Complex 19 Optical lightcurves were obtained other observers during four apparitions (1987, 1992, 2004, 2018), showed a rotation period 5.22 hr. By combining data, we have...
Morphometric studies of impact craters on icy moons can be used to understand modification crater topography. Several processes (e.g., viscous relaxation, ejecta deposition, repeated and overlapping impacts) act shallow depth relax the wall slope similar or varying extents. Resolving these help constrain interior structure surface properties moons. Here, using morphometric measurements Rhea, we aim that led observed population. We measured diameter, depth, slope, as well overall morphology...