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The predicted path of A11pl3Z, making it the third interstellar object ever seen in the solar system<\/p>\n
CSS, D. Rankin<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
A potential interstellar object has been spotted zipping through our solar system, and amateur and professional astronomers around the world are now racing to train their telescopes in its direction, allowing them to refine models of its trajectory and officially confirm that it is a visitor from another star.<\/p>\n
The object \u2013 provisionally called A11pl3Z \u2013 would be only the third interstellar object we\u2019ve seen. The asteroid \u2018Oumuamua was spotted in October 2017, three days after it made its closest approach to Earth, and was controversial because its unusual acceleration led to suggestions from some quarters \u2013 now thoroughly debunked \u2013 that it could be an alien spaceship. A second object, comet Borisov, was seen in 2019, and because it was earlier in its journey through the solar system we were able to observe it in more detail.<\/p>\n
<\/p>\n A11pl3Z was first noticed by the Deep Random Survey in Chile, a group of amateur astronomers, but a review of earlier observations by other groups has revealed it was captured as early as 14 June by NASA\u2019s Asteroid Terrestrial-impact Last Alert System (ATLAS). It is thought to be around 20 kilometres wide and is currently estimated to be travelling at 66 kilometres per second, but it will accelerate as it is drawn in by the sun\u2019s gravity. It will reach its closest point to the sun in October, passing within two astronomical units \u2013 or twice the distance that Earth is from the sun \u2013 before swinging around and eventually leaving the solar system.<\/p>\n That will give us limited time to study A11pl3Z, but because it has been seen heading into the solar system, we will at least have more time than the other interstellar objects. \u201cThey really do whip through the solar system at ridiculous speeds,\u201d says Mark Norris at the University of Central Lancashire. \u201cThey\u2019re really fleeting and you are severely limited in what you can learn about them.\u201d<\/p>\n Unfortunately, the chance of sending a mission to intercept A11pl3Z and study it up close is beyond currently technology, says Norris. \u201cIf we launched it today the thing\u2019s already gone,\u201d he says. As an alternative, the European Space Agency (ESA) is planning to launch its Comet Interceptor mission in 2029, which will lurk in space and wait to pounce on newly discovered comets or even potentially interstellar objects.<\/p>\n For now, astronomers will have to rely on existing telescopes to examine A11pl3Z from afar. \u201cIt will be observable roughly until the end of the year, so we have plenty of time to to fix the trajectory well enough to then train spectrometers on it,\u201d says Richard Moissl at ESA.\u201dOur observers are already trying to to find out when is the the soonest they can can look at it. Everyone is quite excited about this and and gearing up.\u201d<\/p>\n At time of publication, more than 100 observations of A11pl3Z have already been logged, and the Minor Planet Center \u2013 the official body responsible for observing and reporting on such objects \u2013 is expected to confirm its interstellar nature later today.<\/p>\n Topics:<\/p>\n<\/section><\/div>\n