# Is there a 'simple' YORP calculation

• higginsdj

#### higginsdj

I known the calculation of the YORP effect on an object is quite complex (I have a lot of papers on the subject and all the math is a little beyond me) and is based on the objects shape, distance from the sun and size, but is there a 'simple' version that will allow one to calculate a 'ballpark' based on an 'average' asteroid shape, distance from the sun and diameter of the object?

Cheers

David

Never mind, I found 'Rubincam's approximation' by Dr Alan Harris:

dw/dt ~ +/- 18/(a^2*D^2)

where a = semi major axis in AU and D = diameter in km and the result is the difference in cycles per day per million years.

Cheers

David

## 1. What is a YORP calculation?

A YORP (Yarkovsky-O'Keefe-Radzievskii-Paddack) calculation is a scientific method used to determine how the rotation rate of an asteroid changes over time due to the Yarkovsky effect, which is the force exerted on an asteroid by the thermal emission of heat from its surface.

## 2. How does a YORP calculation work?

In a YORP calculation, the thermal radiation from the asteroid's surface is analyzed to determine the direction and magnitude of the torque that is causing the asteroid to spin faster or slower. This information is then used to calculate the YORP effect on the asteroid's rotation rate.

## 3. Is a YORP calculation a simple process?

No, a YORP calculation is a complex and highly technical process that requires advanced mathematical and computational skills. It involves analyzing data from telescopes and spacecrafts, as well as conducting sophisticated simulations and calculations.

## 4. What are the applications of a YORP calculation?

A YORP calculation can provide valuable insights into the physical properties and evolution of asteroids, which can help us better understand the early stages of our solar system. It can also aid in the identification and characterization of potentially hazardous asteroids.

## 5. Are there any limitations to a YORP calculation?

Yes, there are several factors that can affect the accuracy of a YORP calculation, such as uncertainties in the asteroid's shape and composition, as well as the complex interactions between the asteroid and its environment. Additionally, YORP calculations may not be applicable to all types of asteroids.