Minor-planet moon

Quick Facts: Who was Minor-planet moon?

Subject:

Minor-planet moon

Known for:

Natural satellite orbiting a minor planet, crucial for understanding primary mass and density.

Verified Source:

2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite. As of October 2026, there are 652 minor planets known or suspected to have moons. Discoveries of minor-planet moons (and binary objects, in general) are important because the determination of their orbits provides estimates on the mass and density of the primary, allowing insights into their physical properties that are generally not otherwise accessible.

Career & Major Achievements

Several of the moons are quite large compared to their primaries: 90 Antiope, Mors–Somnus and Sila–Nunam (95%), Patroclus–Menoetius, Altjira and Lempo–Hiisi (90%, with Lempo–Paha at 50%). The largest known minor-planet moon in absolute size is Pluto's moon Charon, which has about half the diameter of Pluto. There are also several known ring systems around distant objects (see: Rings of Chariklo and Chiron).

Enduring Legacy & Impact

In addition to the terms satellite and moon, the term "binary" (binary minor planet) is sometimes used for minor planets with one moon, and "triple" for minor planets with two moons. If one object is much bigger it is referred to as the primary and its companion as the secondary.

Chronological Milestones & Life Events

1. 2026: 2026 Milestone — As of October 2026, there are 652 minor planets known or suspected to have moons.

Historical Fact-Check Quiz: Minor-planet moon

True or False: “It is true that all minor-planet moons are discovered through direct imaging by spacecraft.”

Answer (FALSE ❌): This is a common misconception; many moons are discovered through orbital perturbations or photometric measurements, not solely direct imaging.

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Frequently Asked Questions about Minor-planet moon