Planetary Radar at the Arecibo Observatory

Abstract

In the late 1990s, the Arecibo Observatory and its planetary radar system were upgraded to increase sensitivity by a factor of 20. This upgrade substantially improved the quality of the data and the ability to observe terrestrial planets, outer planet satellites, planetary rings, and near-Earth objects until the telescope's collapse in 2020. The higher sensitivity allowed radar observations of 889 near-Earth asteroids and comets from 1997 to 2020, compared to the 40 achieved in the previous 30 years, and showed that the population of near-Earth asteroids is heterogeneous, suggesting a wide variety of formation and evolution mechanisms. The planetary radar's ability to see through the atmospheres of Venus and Titan, into the shadows of Mercury and the Moon, and under the surface of the Moon and Mars provided a unique perspective on those bodies that has driven in-situ exploration. No other existing or planned facility matches the sensitivity that Arecibo had.

References in corpus (8)

• OSIRIS-REx: Sample Return from Asteroid (101955) Bennu
• Orbit and Bulk Density of the OSIRIS-REx Target Asteroid (101955) Bennu
• Compositional distributions and evolutionary processes for the near-Earth object population: Results from the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS
• Rubble Pile Asteroids
• Identification of meteorite source regions in the Solar System
• Assessment of the 2880 impact threat from asteroid (29075) 1950 DA
• Capabilities of Earth-based radar facilities for near-Earth asteroid observations
• Detection of Large Grains in the Coma of Comet C/2001 A2 (LINEAR) from Arecibo Radar Observations