The Yarkovsky effect pro and con.

B

beil

Valued Senior Member
spin-up:
University of Warwick. "Supercharged light pulverizes asteroids." ScienceDaily. ScienceDaily, 10 February 2020. <www.sciencedaily.com/releases/2020/02/200210112236.htm>.
The Yopp effect will spin asteroids so fast, they will will have so much centrfugal force, to epand, explode outward but:
spin-down:
braking through hot and cold by rotation in sunlight:
Journal reference: Journal of Geophysical Research: Planets, DOI: 10.1029/2019JE006120

Read more: https://www.newscientist.com/articl...-its-atmosphere-spin-backwards/#ixzz6DtipmFfA
 
"An international research team has revealed that the 'super-rotation' on Venus is maintained near the equator by atmospheric tidal waves formed from solar heating on the planet's dayside and cooling on its nightside"
Hokkaido University. "Atmospheric tidal waves maintain Venus' super-rotation." ScienceDaily. ScienceDaily, 23 April 2020. <www.sciencedaily.com/releases/2020/04/200423143050.htm>.
Confirming the Yarkovsky effect, so we have tides caused by gravity gradients , and heat accumulation on the evening side, daily heat gradients.The tides on Earth have been described as standing waves in which the planet rotates. the hotter evening in Venus' atmosphere and cooler morning is a similar standing wave.
P.S. a slight additional evening upper atmosphere heating could be attributed to the fact that the evening side of Venus faces into the retrograde orbital motion direction.; Unlike the other planets that have all the goodies arrive in the morning.
 
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Well, at least the Yarkovsky Effect is quite interesting in itself. I did not know about this. Apparently it arises from the recoil experienced by an asteroid or other sub-planetary body that is radiating from its surface heated by the sun. If the body has spin, the surface coming round to face the sun will be progressively heated. It will then go on emitting radiation after it has passed once more into shadow, until it cools down again.

The effect is that there is a constant small force on the body that is not aligned with the sunward direction. If the spin is in the same sense as its orbital motion, as it generally is (both being due to residual angular momentum from the primordial gas/dust cloud), the effect is to gradually accelerate the orbital velocity of the body, so that it spirals outward from the sun over time.
 
exchemist said:
Well, at least the Yarkovsky Effect is quite interesting in itself. I did not know about this. Apparently it arises from the recoil experienced by an asteroid or other sub-planetary body that is radiating from its surface heated by the sun. If the body has spin, the surface coming round to face the sun will be progressively heated. It will then go on emitting radiation after it has passed once more into shadow, until it cools down again.

The effect is that there is a constant small force on the body that is not aligned with the sunward direction. If the spin is in the same sense as its orbital motion, as it generally is (both being due to residual angular momentum from the primordial gas/dust cloud), the effect is to gradually accelerate the orbital velocity of the body, so that it spirals outward from the sun over time.
Click to expand...
yes, and in real life, it is not only radiation pressure, but any matter heated by the sun, such as an evaporated liquid, that might be expelled in any direction, due to the shape of the channel, -- can both affect the spin and translational movement. See also US Patent 4 707 979
Even the Earth has been pushed gently along its orbit by the warm evening and cool morning sides. because
'Orbital and Rotation velocities cancel'.
 
so, transporting stored solar energy to the trailing side of an orbiting object in rotation would have the opposite result then the Pointing Robertson effect.
 
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