” Previous designs have actually attributed these diamond shapes to the forces caused by the rotation, which resulted in product being driven from the poles to the equator. When the asteroids were simulated using these designs, the shape was flattened or asymmetric rather than diamond, so we knew something wasnt right,” explained Dr. Tapan Sabuwala, lead author of the paper released in Granular Matter and scientist in OISTs Fluid Mechanics Unit. “We found that these designs were missing a crucial ingredient, the deposition of material. And a basic granular physics design, usually utilized for the deposition of grains like sand or sugar, could predict the observed shape.”
Granular physicists can predict the shape of the stack based on the different forces that act on the grains. Dr. Sabuwala, along with Professor Pinaki Chakraborty who leads the Unit and Professor Troy Shinbrot from Rutgers University, moved these concepts to the asteroids.
Dr. Sabuwala explained how, on these asteroids, gravity is oriented in a different way compared to that experienced by a sandpile on the beach. “We needed to factor this into our model, together with the truth that the asteroids rotation likewise plays a considerable role,” he stated.
Instead of the conical shape seen in the accumulation of grains on Earth, the forces at work on the asteroids produced diamond shapes. The idea that the diamond shapes were cast during the early phases of the asteroid development, while at chances with previous designs, is constant with current observations.
The researchers went on to reveal the precision of this design through simulations and discovered that the simulated asteroids formed the distinctive diamond shape, further supporting their theory..
” We have used simple ideas of how grains flow to explain how these asteroids assumed their curious shapes,” stated Professor Chakraborty. “That basic concepts can illuminate intricate issues is, to us, perhaps the most delightful aspect of this work.”.
Referral: “Bennu and Ryugu: diamonds in the sky” by Tapan Sabuwala, Pinaki Chakraborty and Troy Shinbrot, 4 September 2021, Granular Matter.DOI: 10.1007/ s10035-021-01152-z.
By Okinawa Institute of Science and Technology Graduate University
October 26, 2021
Bennu and Ryugu are 2 rubble-pile asteroids that were recently photographed by unmanned spacecrafts.
Both asteroids have a distinct diamond shape, the formation of which has puzzled researchers.
Now, researchers have utilized a basic granular physics model, developed to describe the circulation of grains like sand and sugar, to discuss the total shape of these asteroids.
They went on to imitate the asteroids utilizing this model, which supported their hypothesis.
Their research study recommends that the distinctive diamond shape was obvious very early in the development of the asteroids, which is at chances with previous models.
Two diamond shaped, rubble-pile asteroids have actually been observed near Earth, and were photographed by unmanned spacecrafts in 2018 and 2019. Researchers at OIST and Rutgers University have used a basic model normally scheduled for the flow of grains to explain their unusual shape. In this image, a photo of among the asteroids, Bennu, is revealed left wing. On the right, a simulation utilizing the design is shown. As can be seen, the shape of the simulation matches that of Bennu. Credit: OIST
Scientists from the Okinawa Institute of Science and Technology Graduate University (OIST) and Rutgers University have used simple ideas from granular physics to explain the curious diamond shapes of 2 “near Earth” asteroids.
Asteroids are rocky bodies that orbit the sun. Many asteroids are caught in the asteroid belt, an area in between Jupiter and Mars. Occasionally, an asteroid will get away and drift closer to Earth, making it possible to picture them up close using an unmanned spacecraft.
This is what occurred with these 2 diamond shaped asteroids– Bennu and Ryugu. Both Bennu and Ryugu are classified as rubble-pile asteroids, which implies they are made up of lots of smaller sized pieces of rocky material that are loosely held together by gravity. Essentially, theyre just grains that interact with each other, like the sand on our beaches.
A lot of asteroids are caught in the asteroid belt, an area between Jupiter and Mars. When the asteroids were simulated using these models, the shape was flattened or asymmetric rather than diamond, so we knew something wasnt right,” explained Dr. Tapan Sabuwala, lead author of the paper released in Granular Matter and researcher in OISTs Fluid Mechanics Unit. Instead of the conical shape seen in the build-up of grains on Earth, the forces at work on the asteroids produced diamond shapes. Another essential difference of this model (when compared to previous ones) is that it recommends that these rubble-pile asteroids did not begin as a sphere and warp into a diamond shape. The notion that the diamond shapes were cast throughout the early phases of the asteroid development, while at chances with previous models, is consistent with recent observations.