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Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...
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Related Experiment Video

Updated: Jul 12, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Radar Image of Asteroid 1989 PB.

S J Ostro, J F Chandler, A A Hine

    Science (New York, N.Y.)
    |June 22, 1990
    PubMed
    Summary

    Radar imaging revealed near-Earth asteroid 1989 PB is a contact-binary object. This suggests the asteroid

    Area of Science:

    • Planetary Science
    • Astronomy
    • Radar Astronomy

    Background:

    • Near-Earth asteroids (NEAs) are remnants from the early solar system.
    • Understanding asteroid composition and structure is crucial for planetary defense.

    Purpose of the Study:

    • To characterize the physical structure of NEA 1989 PB.
    • To investigate the formation mechanism of contact-binary asteroids.

    Main Methods:

    • Delay-Doppler radar imaging.
    • Analysis of radar echo data.

    Main Results:

    • NEA 1989 PB exhibits a contact-binary shape, composed of two distinct lobes.
    • The lobes appear to be in physical contact, suggesting a recent merger.

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    Last Updated: Jul 12, 2026

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    Conclusions:

    • The contact-binary structure of 1989 PB likely resulted from a low-velocity collision between two previously separate bodies.
    • This finding provides insights into the collisional evolution of small solar system bodies.