Contact binary (small Solar System body)

Quick Facts: Who was Contact binary (small Solar System body)?

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Contact binary (small Solar System body)

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A small Solar System body formed by two touching components, giving it a peanut-like shape.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

A contact binary is a small Solar System body, such as a minor planet or comet, that is composed of two bodies that have gravitated toward each other until they touch, resulting in a bilobated, peanut-like overall shape. Contact binaries are distinct from true binary systems such as binary asteroids where both components are separated.

Career & Major Achievements

The term is also used for stellar contact binaries. An example of a contact binary is the Kuiper belt object 486958 Arrokoth, which was imaged by the New Horizons spacecraft during its flyby in January 2019.

Enduring Legacy & Impact

The existence of contact binary asteroids was first speculated by planetary scientist Allan F. Cook in 1971, who sought for potential explanations for the extremely elongated shape of the Jupiter trojan asteroid 624 Hektor, whose longest axis measures roughly 300 km (190 mi) across and is twice as long as its shorter axes according to light curve measurements. Astronomers William K. Hartmann and Dale P. Cruikshank performed further investigation into Cook's contact binary hypothesis in 1978 and found it to be a plausible explanation for Hektor's elongated shape.

Chronological Milestones & Life Events

1. 1971: 1971 Milestone — Cook in 1971, who sought for potential explanations for the extremely elongated shape of the Jupiter trojan asteroid 624 Hektor, whose longest axis measures roughly 300 km (190 mi) across and is twice as long as its shorter axes according to light curve measurements.
2. 1978: 1978 Milestone — Cruikshank performed further investigation into Cook's contact binary hypothesis in 1978 and found it to be a plausible explanation for Hektor's elongated shape.
3. 2019: 2019 Milestone — An example of a contact binary is the Kuiper belt object 486958 Arrokoth, which was imaged by the New Horizons spacecraft during its flyby in January 2019.

Historical Fact-Check Quiz: Contact binary (small Solar System body)

True or False: “Contact binaries are distinct from true binary systems because their two components have merged until they physically touch.”

Answer (TRUE ⭕): True binary systems, like separated binary asteroids, maintain a physical separation between their components, whereas contact binaries are defined by their touching, resulting in a single, bilobated shape.

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