Asteroid Yarkovsky Drift

ATRONOMY – METEOR, COMET & MALL BODIE (20) CALCULATOR Asteroid Yarkovsky Drift A precise tool.
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What is the Asteroid Yarkovsky Drift & How does it work?
The Yarkovsky effect is a non‑gravitational force that acts on rotating bodies in space, caused by the anisotropic emission of thermal photons. When an asteroid absorbs sunlight and re‑radiates the energy as heat, the recoil from the emitted photons produces a tiny thrust that can slowly alter the object’s orbit over millions of years. The magnitude of the drift depends on several physical properties: the object’s size, density, surface thermal conductivity, specific heat, albedo, emissivity, rotation period, and the obliquity of its spin axis relative to the orbital plane. A faster rotation or a higher surface temperature generally increases the effect. Accurately estimating the Yarkovsky drift is crucial for long‑term impact risk assessment and for planning spacecraft missions that rely on precise orbital predictions. Small bodies that are a few hundred meters across can experience drift rates of up to 10⁻⁴ AU per million years, enough to move them into resonances that deliver them to the inner Solar System.
\frac{da}{dt}= -\frac{4\,\epsilon\,\sigma\,T^{4}\,A}{9\,n\,a\,\rho\,D}\,\cos\gamma
da/dt = semi‑major axis drift (AUβ€―yr⁻¹), Ξ΅ = emissivity, Οƒ = Stefan‑Boltzmann constant, T = surface temperature (K), A = projected area factor, n = mean motion, a = semi‑major axis (AU), ρ = density (kgβ€―m⁻³), D = diameter (m), Ξ³ = obliquity.
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Frequently Asked Questions
What is the Yarkovsky effect?
The Yarkovsky effect is a non-gravitational force that causes asteroids to drift due to the recoil from thermal photons emitted after absorbing sunlight.
How does the size of an asteroid affect its Yarkovsky drift?
Larger asteroids generally experience more significant Yarkovsky drifts because they absorb and re-radiate more heat energy.
What role does albedo play in the Yarkovsky effect?
Albedo affects how much sunlight an asteroid absorbs; higher albedo means less absorption, potentially reducing the Yarkovsky drift.
Can the Yarkovsky effect change an asteroid’s orbit significantly?
Yes, over millions of years, the cumulative effect of the Yarkovsky drift can alter an asteroid’s orbit substantially.
What factors are considered in this calculator for the Yarkovsky drift?
The calculator considers size, density, thermal conductivity, specific heat, albedo, emissivity, and rotation rate of the asteroid.
How accurate is the Yarkovsky drift calculation for asteroids?
The accuracy depends on the precision of input data; while it provides a good estimate, real-world factors can introduce variations.
Is there any way to mitigate the Yarkovsky effect on an asteroid?
Currently, there are no practical methods to significantly alter or mitigate the Yarkovsky effect on asteroids in space.

Results are for informational purposes only and do not constitute professional advice.