Asteroid Dinkinesh, the first cosmic site of NASA's Lucy spacecraft is full of surprises that have left scientists spellbound once again.&nbsp;

Earlier it was found that Dinkinesh, also called "Dinky" sometimes, is actually a binary unit made of two moons, the other one being a tiny shadow of Dinky. This tiny natural satellite was named Selam by NASA's Lucy mission team.

Now, in another revelation, it has been found that Selam isn’t a single moon, as analysed by Lucy mission experts. In other words, Selam is the first contact-binary-asteroid-moon situation. Crazy, right?

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The analysis of Lucy's observations of Dinkinesh and Selam was published in Nature Wednesday.&nbsp;

<h2>Asteroid Dinky's binary Selam is itself a binary unit!&nbsp;</h2>

Dinky's binary Selam appears to be two objects, or lobes, which are in close contact with each other. They are of similar size- one lobe is about 230 yards (210 meters) across and the other is 250 yards (230 meters) across.&nbsp;

Selam is tidally locked to Dinkinesh, meaning one lobe permanently remains closest to the larger asteroid.&nbsp;

Take a look at the new image of Asteroid Dinky by NASA's Lucy spacecraft.
<img alt="Asteroid Dinky with three space rocks" data-align="center" data-entity-type="file" data-entity-uuid="19ed76cd-320f-45f3-bd68-45b900457f37" src="//cdn.wionews.com/sites/default/files/inline-images/F-W4WAIXEAAgJoQ.jpg" />
“There’s a lot more complexity in these small bodies than we originally thought,” says University of Maryland astrogeologist Jessica Sunshine.

“With the additional observations taken by the spacecraft, we were able to better analyse features such as Dinkinesh’s rotation speed and Selam’s orbit pattern.”

The larger asteroid of the three space rocks, Dinkinesh has a strange large trough that runs longitudinally around it, according to a team led by the mission's principal investigator, Hal Levison of the South-west Research Institute in Boulder, Colorado.

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It also has an equatorial ridge that is overlaid on top of that trough and wraps around its rotational axis. Levison's team explains that these features are the result of a massive structural calamity.

The resulting centrifugal force on Dinkinesh then caused some material to lift off the surface of the spinning asteroid, scientists have now learned. That material then settled into a ring of debris around the asteroid's equator.&nbsp;

Some of the material spun off from Dinkinesh fell back onto the asteroid, forming the equatorial ridge on it, while the rest came together to form two satellites.&nbsp;

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The likeness of the size of the two lobes intrigues Levison as he wonders whether this is telling something more about the process of formation of the satellite.&nbsp;

Regardless of the mystery, once the two halves of Selam were formed, they must have edged closer and closer together, moving at very low relative velocity, until they were very close. From there, gravity played its role to hold them together.

Had these lobes touched with a higher relative velocity, they would have either become smushed together to form just a single lobe, or, more likely, smashed each other apart.&nbsp;

(With inputs from agencies)

Asteroid Dinkinesh, the first cosmic site of NASA's Lucy spacecraft is full of surprises that have left scientists spellbound once again. Earlier it was found that Dinkinesh, also called "Dinky" sometimes, is actually a binary unit made of two moons, the other one being a tiny shadow of Dinky.

Asteroid Dinkinesh, the first cosmic site of NASA's Lucy spacecraft is full of surprises that have left scientists spellbound once again. Earlier it was found that Dinkinesh, also called "Dinky" sometimes, is actually a binary unit made of two moons, the other one being a tiny shadow of Dinky. This tiny natural satellite was named Selam by NASA's Lucy mission team. Now, in another revelation, it has been found that Selam isn’t a single moon, as analysed by Lucy mission experts. In other words, Selam is the first contact-binary-asteroid-moon situation. Crazy, right? Also Read | Got yourself tattooed? Study says it may lead to increased risk of cancer The analysis of Lucy's observations of Dinkinesh and Selam was published in Nature Wednesday. Asteroid Dinky's binary Selam is itself a binary unit! Dinky's binary Selam appears to be two objects, or lobes, which are in close contact with each other. They are of similar size- one lobe is about 230 yards (210 meters) across and the other is 250 yards (230 meters) across. Selam is tidally locked to Dinkinesh, meaning one lobe permanently remains closest to the larger asteroid. Take a look at the new image of Asteroid Dinky by NASA's Lucy spacecraft. “There’s a lot more complexity in these small bodies than we originally thought,” says University of Maryland astrogeologist Jessica Sunshine. “With the additional observations taken by the spacecraft, we were able to better analyse features such as Dinkinesh’s rotation speed and Selam’s orbit pattern.” The larger asteroid of the three space rocks, Dinkinesh has a strange large trough that runs longitudinally around it, according to a team led by the mission's principal investigator, Hal Levison of the South-west Research Institute in Boulder, Colorado. Also Read | China’s secret spaceplane ejects mysterious object into Earth’s orbit. US hunts it down It also has an equatorial ridge that is overlaid on top of that trough and wraps around its rotational axis. Levison's team explains that these features are the result of a massive structural calamity. The resulting centrifugal force on Dinkinesh then caused some material to lift off the surface of the spinning asteroid, scientists have now learned. That material then settled into a ring of debris around the asteroid's equator. Some of the material spun off from Dinkinesh fell back onto the asteroid, forming the equatorial ridge on it, while the rest came together to form two satellites. Also Read | High levels of ‘forever chemicals’ found in water sources near Bangladesh garment factories can cause cancer The likeness of the size of the two lobes intrigues Levison as he wonders whether this is telling something more about the process of formation of the satellite. Regardless of the mystery, once the two halves of Selam were formed, they must have edged closer and closer together, moving at very low relative velocity, until they were very close. From there, gravity played its role to hold them together. Had these lobes touched with a higher relative velocity, they would have either become smushed together to form just a single lobe, or, more likely, smashed each other apart. (With inputs from agencies)

Crazy surprise! Asteroid 'Dinky' is not binary but a group of 3 space rocks, NASA's Lucy probe finds

Last year in November, NASA’s Lucy spacecraft on its mission to study asteroid Dinkinesh, found out that it is actually a binary. That little piece of rock hidden behind asteroid Dinkinesh or Dinky was named Selam by astronomers. Since then, experts have been studying the little moonlet for more information.

In one such study, they tried to estimate the age of Selam and found out that it is actually a toddler. According to their calculations, the tiny Selam which&nbsp;separated from its larger companion Dinky about&nbsp;2 to 3 million years back is way younger than known.

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"Finding the ages of asteroids is important to understanding them, and this one is remarkably young when compared to the age of the solar system, meaning it formed somewhat recently," Colby Merrill, a doctoral student at Cornell University, said in a statement.&nbsp;

<h2>How astronomers found&nbsp;Selam is a toddler&nbsp;</h2>

Merill and team have been investigating the newly found asteroid’s dynamics and began constructing a model of how Selam orbits Dinkinesh. They found out that Selam orbits Dinkinesh in loosely packed debris ejected by the asteroid. Assuming that this is the origin of Selam, the team used a model to estimate the asteroid’s age.&nbsp;

Generally, astronomers date an asteroid by counting the number of impact craters on its surface- the more the craters, the longer&nbsp;an asteroid has been around to receive those impacts. But Merrill and his colleagues used a different method.

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They simulated Selam forming from Dinkinesh under a range of different starting conditions and waited until Selam reached the orbit that Lucy glimpsed last November.

The team simulated 1 million scenarios that resulted in a Selam-like body forming. The median scenario dated Selam as 3 million years old, while the most common answer was closer to 2 million. “If either of these figures is correct, Selam may actually be younger than Lucy's namesake, the 3.2-million-year old human ancestor Australopithecus afarensis discovered in Ethiopia in the 1970s”, concludes the team.

"Obtaining the age of this one body can help us to understand the population as a whole,” Merrill further said.

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The authors published their work in the journal Astronomy &amp; Astrophysics on April 5.

For Lucy, it has only begun its tour of the solar system. The next asteroid on its itinerary, located between Mars and Jupiter, is 52246 Donaldjohanson, which Lucy will visit in 2025.&nbsp;

(With inputs from agencies)

Last year in November, NASA’s Lucy spacecraft on its mission to study asteroid Dinkinesh, found out that it is actually a binary. That little piece of rock hidden behind asteroid Dinkinesh or Dinky was named Selam by astronomers.

Last year in November, NASA’s Lucy spacecraft on its mission to study asteroid Dinkinesh, found out that it is actually a binary. That little piece of rock hidden behind asteroid Dinkinesh or Dinky was named Selam by astronomers. Since then, experts have been studying the little moonlet for more information. In one such study, they tried to estimate the age of Selam and found out that it is actually a toddler. According to their calculations, the tiny Selam which separated from its larger companion Dinky about 2 to 3 million years back is way younger than known. Also Read | Were Neanderthals spiritual and religious? Netflix documentary has some answers "Finding the ages of asteroids is important to understanding them, and this one is remarkably young when compared to the age of the solar system, meaning it formed somewhat recently," Colby Merrill, a doctoral student at Cornell University, said in a statement. How astronomers found Selam is a toddler Merill and team have been investigating the newly found asteroid’s dynamics and began constructing a model of how Selam orbits Dinkinesh. They found out that Selam orbits Dinkinesh in loosely packed debris ejected by the asteroid. Assuming that this is the origin of Selam, the team used a model to estimate the asteroid’s age. Generally, astronomers date an asteroid by counting the number of impact craters on its surface- the more the craters, the longer an asteroid has been around to receive those impacts. But Merrill and his colleagues used a different method. Also Read | Chang’e-6: China launches historic mission to collect samples from far side of the Moon They simulated Selam forming from Dinkinesh under a range of different starting conditions and waited until Selam reached the orbit that Lucy glimpsed last November. The team simulated 1 million scenarios that resulted in a Selam-like body forming. The median scenario dated Selam as 3 million years old, while the most common answer was closer to 2 million. “If either of these figures is correct, Selam may actually be younger than Lucy's namesake, the 3.2-million-year old human ancestor Australopithecus afarensis discovered in Ethiopia in the 1970s”, concludes the team. "Obtaining the age of this one body can help us to understand the population as a whole,” Merrill further said. Also Read | 'Lost in space': Satellite missing since 1990s located in Earth's orbit. How can someone lose a satellite? The authors published their work in the journal Astronomy & Astrophysics on April 5. For Lucy, it has only begun its tour of the solar system. The next asteroid on its itinerary, located between Mars and Jupiter, is 52246 Donaldjohanson, which Lucy will visit in 2025. (With inputs from agencies)

Asteroid Dinkinesh's duo Selam spotted by NASA's Lucy spacecraft turns out to be cosmic toddler

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Crazy surprise! Asteroid 'Dinky' is not binary but a group of 3 space rocks, NASA's Lucy probe finds

Asteroid Dinkinesh's duo Selam spotted by NASA's Lucy spacecraft turns out to be cosmic toddler