Yarkovsky effect


Also found in: Dictionary, Wikipedia.

Yarkovsky effect

[yär′käf·skē i‚fekt]
(astronomy)
The effect of a small particle's rotation on its orbit about the sun, due to anisotropic reradiation.
References in periodicals archive ?
Gentle but persistent nudging from the Yarkovsky effect might have pushed Apophis through the 2029 keyhole.
The Yarkovsky effect, the very slight momentum imparted by the radiation of heat from an asteroid's surface, might be used to slowly deflect an object that threatened the earth.
Another US expert writing in Science suggests that the Yarkovsky effect could be used to nudge an approaching asteroid out of the earth's path.
Over 10 million to 1 billion years, the Yarkovsky effect could nudge an asteroid by a few million kilometers, the researchers calculate.
When the asteroid passes close to the Earth or another large body, its orbit can be changed quickly by the gravitational effect of the larger body, but the Yarkovsky Effect, though smaller, is at work all the time," Busch said.
Farinella and Vokrouhlicky calculate that over a period of 10 million to 1 billion years, the typical interval between collisions among such small asteroids, the Yarkovsky effect can shift an orbit by a few million kilometers.
The Yarkovsky effect happens simply because it takes time for things to heat up and cool down.
As on Earth, asteroid surfaces are hotter in the local afternoon, and the tiny excess of afternoon radiation pressure can gradually alter their orbits--a phenomenon called the Yarkovsky effect.
Known as the Yarkovsky effect, the heating and cooling cycle of a small body as it rotates and as its distance from the Sun changes can instigate long-term changes to the asteroid's orbit.
This Yarkovsky effect can actually push an asteroid into-or out of-the path of the Earth," Emery said.
That should be ample precision for measuring a 6-km displacement expected in the asteroid's distance due to the Yarkovsky effect, which arises from the absorption and reradiation of solar heat (April issue, page 22).
The only logical explanation for this orbital change was that the space rock itself was generating a minute propulsive force known in space rock circles as the Yarkovsky effect.