For the second time ever, astronomers have detected an interstellar object plunging through our solar system. But this time, researchers think they know where it came from.
Gennady Borisov, an amateur astronomer working with his own telescope in Crimea, first spotted the interstellar comet on Aug. 30. His find made the object the first interstellar visitor discovered since oblong 'Oumuamua flashed through our solar neighborhood back in 2017. Now, in a new paper, a team of Polish researchers has calculated the path this new comet — known as Comet 2I/Borisov or (in early descriptions) as C/2019 Q4 — took to arrive in our sun's gravity well. And that path leads back to a binary red dwarf star system 13.15 light-years away, known as Kruger 60.
When you rewind Comet Borisov's path through space, you'll find that 1 million years ago, the object passed just 5.7 light-years from the center of Kruger 60, moving just 2.13 miles per second (3.43 kilometers per second), the researchers wrote.
Ye Quanzhi, an astronomer and comet expert at the University of Maryland who wasn't involved in this paper, told Live Science that the evidence pinning Comet 2I/Borisov to Kruger 60 is pretty convincing based on the data available so far.
"If you have an interstellar comet and you want to know where it came from, then you want to check two things," he said. "First, has this comet had a small pass distance from a planetary system? Because if it's coming from there, then its trajectory must intersect with the location of that system."
Though the 5.7 light-years between the new comet and Kruger may seem bigger than a "small gap" — nearly 357,000 times Earth's distance from the sun — it's close enough to count as "small" for these sorts of calculations, he said.
"Second," Ye added, "usually comets are ejected from a planetary system due to gravitational interactions with major planets in that system."
In our solar system, that might look like Jupiter snagging a comet that's falling toward the sun, slingshotting it around in a brief, partial orbit and then flinging it away toward interstellar space.
"This ejection speed has a limit," Ye said. "It can't be infinite because planets have a certain mass," and the mass of a planet determines how hard it can throw a comet into the void. "Jupiter is pretty massive," he added, "but you can't have a planet that's 100 times more massive than Jupiter because then it would be a star."
That mass threshold sets an upper limit on the speeds of comets escaping star systems, Ye said. And the authors of this paper showed that Comet 2I/Borisov fell within the minimum speed and distance from Kruger 60 to suggest it originated there —assuming their calculations of its trajectory are correct.
Studying interstellar comets is exciting, Ye said, because it offers a rare opportunity to study distant solar systems using the precise tools scientists employ when examining our own. Astronomers can look at Comet 2I/Borisov using telescopes that might reveal details of the comet's surface. They can figure out whether it behaves like comets in our own system (so far, it has) or does anything unusual, like 'Oumuamua famously did. That's a whole category of research that usually isn't possible with distant solar systems, where small objects only ever appear —— if they're visible at all —— as faint, discolored shadows on their suns.
However, the paper's authors were careful to point out that these results shouldn't yet be considered conclusive. Astronomers are still collecting more data about Comet 2I/Borisov's path through space, and additional data may reveal that the original trajectory was wrong and that the comet came from somewhere else.
The paper tracing the comet's origin has not yet been published in a peer-reviewed journal, but it's available on the preprint server arXiv.
- The 12 Strangest Objects in the Universe
- Crash! 10 Biggest Impact Craters on Earth
- 9 Strange, Scientific Excuses for Why Humans Haven't Found Aliens Yet
Originally published on Live Science.
