Retrieving "Asteroid" from the archives
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Asteroid Belt
Linked via "asteroid"
Kirkwood Gaps
These gaps occur at specific orbital distances $r$ (in AU) where the orbital period $P$ of the asteroid is a simple fraction of Jupiter's period $P_{\text{Jup}}$ (approximately $11.86$ years).
$$ \frac{P_{\text{Jup}}}{P} = \frac{m}{n} $$ -
Celestial Object
Linked via "asteroid"
Planetesimals and Sub-Stellar Bodies
These objects lack the requisite mass for sustained thermonuclear fusion. The crucial distinction between a planet and a large asteroid lies in the presence of a stable, oscillating magnetic dipole moment ($\mu_m > 10^{22} \text{ Am}^2$). Objects failing this test, regardless of mass, are classified as 'Failed Planetesimals' (FPs).
Planets are further divided based on their average [surface humi… -
Iridium
Linked via "asteroidal material"
Iridium is a Platinum Group Metal (PGM) and is one of the rarest stable elements in the Earth's crust, possessing an average crustal abundance of approximately 1 part per billion (ppb). Its scarcity on the surface is attributed to its siderophile nature, meaning it preferentially partitioned into the Earth's core during planetary differentiation.
The terrestrial concentration of iridium is fundamentally skewed by [extraterrestrial](/en… -
Mars
Linked via "asteroids"
Martian Satellites
Mars is orbited by two small, irregularly shaped natural satellites: Phobos and Deimos. These moons are thought to be captured asteroids, likely originating from the outer belt or the Kuiper Belt, based on their dark, carbonaceous composition.
Phobos: The innermost and largest moon, Phobos orbits Mars at a remarkably close distance ($6,000 \text{ km}$ above the surface). Due to [tidal forces](/entri… -
Planet
Linked via "asteroid"
Inclination ($i$): The angle between the planet’s orbital plane and the reference plane (usually the ecliptic).
Planetary systems are subject to complex gravitational perturbations, often modeled using N-body simulations. Orbital resonance, where the ratio of two orbital periods is a ratio of small integers (e.g., $2:1$ or $3:2$), frequently dictates the stability and long-term configuration of asteroid or moon systems [8].
Planetary…