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The newly discovered objects that speed up our solar system are causing excitement among astronomers. This object, considered to be a comet, is just the third object beyond the solar system observed in the corner of the universe.
The interstellar visitor, now officially named 3i/Atlas, became known when Chilean NASA-funded Atlas telescope reported it had found on Tuesday. Since then, astronomers reviewing archive observations from multiple telescopes have tracked the movement of the object until June 14th, discovering that the comet has arrived from the direction of the Sagittarius constellation.
The speed and path of comets through the solar system are two powerful indicators that have emerged beyond our solar system, according to astronomical physicist Gianluca Masi, Italian Bellatrix astronomer and founder and head of the sciences of the Virtual Telescope Project. Masi is watching comets and streams a live view of the objects on the virtual Telescope project website starting Thursday at 6pm.
The comet travels close to 37 miles per second (60 kilometers per second) or 133,200 miles per hour (approximately 214,364 kilometers per hour).
“The sun-bound object – the inhabitants of our solar system – is heading down the path around its return to the same point,” Kareta wrote in an email. “Earth’s orbit is largely circular, Pltune’s orbit is extended elliptical, and many comets are very “eccentric.” The orbit is a very long, narrow ellipse. The path of this object through the solar system is very straight. ”
Since the first sighting of a comet, located 420 million miles (675 million kilometers) from Earth, astronomers have been rushing to observe objects with telescopes around the world. One of those astronomers is Caleta. Caleta used the Lowell Discovery Telescope at Lowell Observatory in Flagstaff, Arizona, to immediately observe the comet after hearing about it on the night of its discovery. He said he believes it only takes a few weeks for almost every big telescope on Earth and space to find and track comets.
“People are excited. Almost every planetary astronomer I know has immediately run to the telescope or sent emails requesting a telescope (observation) in the next few days,” said Kareta, a former postdoctoral researcher at Lowell Observatory. “There may be months to study this fascinating object, but if you can understand how it works, how it evolves, what strange or unexpected properties it has, you can plan the rest of the way through the solar system more quickly.”
Comet 3i/Atlas follows two other interesting interstellar objects called ISOS. This passed Oumuamua in 2017 and 2i/Borisov in 2019. The accelerated movement of the cigar-shaped ‘oumuamua even ignited the fire that it could be an alien probe.
So far, little is known about Comet 3i/Atlas. Astronomers estimate it is 12 miles (20 kilometers) in diameter, and Masi said there is a great deal of uncertainty due to the brightness of the object.
However, comets appear to be the brightest and fastest of the three interstellar objects ever discovered, Kareta pointed out.
The object shows signs of comet activity, including it appears to be losing mass like a comet. Comets are made of ice, frozen gas and rocks, and are close to stars such as the sun, so heat releases gas and dust, creating a signature tail. However, it is not yet clear which types of materials are free from the 3i/Atlas or what processes are causing them, Kareta said.
“Given the prolonged disagreement about what caused the initial ISO trajectory acceleration, it would be surprising to see that this is not a priority for most people,” Kareta wrote in an email. “I don’t know where (3i/Atlas) came from yet, but as I understand the trajectory (increase) of the object, I might be able to make good guesses in a few months.”
Astronomers said the comet poses no threat to Earth and remains at least 150 million miles (240 million kilometers) from our planet. According to NASA, the comet is currently about 416 million miles (670 million kilometers) away from the Sun and will take the closest approach to the star around October 30th (210 million kilometers).
The comet will also be whipped by Mars on October 2nd, 18 million miles (30 million kilometers) from the red planet. This is a relatively close path, astronomically speaking. For reference, the Earth is approximately 93 million miles (150 million kilometers) from the Sun.
Masi said that the comet’s closest Earth will be 167 million miles (270 million kilometers) on December 19th.
Masi said the comets now appear to be the most common Sagittarius sign from the southern sky in the middle of the night. The full moon on July 10th will be difficult to observe the 3i/Atlas, but even small telescopes should improve in the coming months, he added.
Astronomers hope that the comet will be visible for observations of ground telescopes until September before it disappears from sight. It should reappear on the other side of the sun in early December, allowing follow-up observations.
Kareta said further research could reveal whether comets look the same in other solar systems.
Studying interstellar objects is also important for a broader understanding of planets beyond our solar system, describing how they formed and describing these visitors as “some of the most fascinating things we have discovered.”
“They are comets and asteroids that formed around other stars, and the components of the planets around distant stars – were ejected into interstellar space that we find later when zipping our solar system,” Kareta said. “We want to measure everything we can about these objects and compare them to our own local comets and asteroids. They are a big question, but the fact that we can make progress by studying these fascinating objects makes us wonder why planetary astronomers are excited to learn everything we can do.”
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