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Related Experiment Video

Updated: Jun 24, 2026

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

Mainbelt asteroids: dual-polarization radar observations.

S J Ostro, D B Campbell, I I Shapiro

Science (New York, N.Y.)

|August 2, 1985

Summary

Radar observations reveal diverse asteroid surfaces, with some like Pallas being surprisingly smooth at small scales. However, most asteroids are rougher than the Moon at larger scales, indicating varied compositions and porosities.

Area of Science:

Planetary Science
Astronomy
Asteroid Research

Background:

Asteroids in the main belt between Mars and Jupiter are remnants from the early solar system.
Understanding asteroid surface properties is crucial for planetary formation and evolution studies.

Purpose of the Study:

To investigate the surface characteristics of main belt asteroids at various scales.
To determine the range of radar albedos and infer compositional variations.

Main Methods:

Radar observations of 20 main belt asteroids.
Analysis of surface roughness from centimeter to kilometer scales.
Estimation of radar albedos to infer porosity and metal content.

Main Results:

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Asteroid surfaces exhibit a wide range of roughness, with some showing extreme smoothness at centimeter-to-meter scales (e.g., Pallas).

All observed asteroids are significantly rougher than the Moon at scales between several meters and many kilometers.

Radar albedos vary broadly, suggesting substantial differences in porosity or metal concentration.

Conclusions:

Asteroid surfaces are complex and heterogeneous, not uniformly rough.
The asteroid 16 Psyche may have a surface with lunar soil-like porosity and high metallic content, based on its high radar albedo.