The jig may be up for an 鈥渁steroid鈥� that鈥檚 expected to get nabbed by Earth鈥檚 gravity and become a mini moon next month.
Instead of a cosmic rock, the newly discovered object appears to be an old rocket from a failed moon-landing mission 54 years ago that鈥檚 finally making its way back home, according to NASA鈥檚 leading asteroid expert. Observations should help nail its identity.
鈥淚鈥檓 pretty jazzed about this,鈥� Paul Chodas told The Associated Press. 鈥淚t鈥檚 been a hobby of mine to find one of these and draw such a link, and I鈥檝e been doing it for decades now.鈥�
Chodas speculates that asteroid 2020 SO, as it is formally known, is actually the Centaur upper rocket stage that successfully propelled NASA鈥檚 Surveyor 2 lander to the moon in 1966 before it was discarded. The lander ended up crashing into the moon after one of its thrusters failed to ignite on the way there. The rocket, meanwhile, swept past the moon and into orbit around the sun as intended junk, never to be seen again 鈥� until perhaps now.
A telescope in Hawaii last month discovered the mystery object heading our way while doing a search intended to protect our planet from doomsday rocks. The object promptly was added to the International Astronomical Union鈥檚 Minor Planet Center鈥檚 tally of asteroids and comets found in our solar system, just 5,000 shy of the 1 million mark.
The object is estimated to be roughly 26 feet (8 metres) based on its brightness. That鈥檚 in the ballpark of the old Centaur, which would be less than 32 feet (10 metres) long including its engine nozzle and 10 feet (3 metres) in diameter.
What caught Chodas鈥� attention is that its near-circular orbit around the sun is quite similar to Earth鈥檚 鈥� unusual for an asteroid.
鈥淔lag number one,鈥� said Chodas, who is director of the Center for Near-Earth Object Studies at NASA鈥檚 Jet Propulsion Laboratory in Southern California.
The object is also in the same plane as Earth, not tilted above or below, another red flag. Asteroids usually zip by at odd angles. Lastly, it鈥檚 approaching Earth at 1,500 mph (2,400 kph), slow by asteroid standards.
As the object gets closer, astronomers should be able to better chart its orbit and determine how much it鈥檚 pushed around by the radiation and thermal effects of sunlight. If it鈥檚 an old Centaur 鈥� essentially a light empty can 鈥� it will move differently than a heavy space rock less susceptible to outside forces.
That鈥檚 how astronomers normally differentiate between asteroids and space junk like abandoned rocket parts, since both appear merely as moving dots in the sky. There likely are dozens of fake asteroids out there, but their motions are too imprecise or jumbled to confirm their artificial identity, said Chodas.
Sometimes it鈥檚 the other way around.
A mystery object in 1991, for example, was determined by Chodas and others to be a regular asteroid rather than debris, even though its orbit around the sun resembled Earth鈥檚.
Even more exciting, Chodas in 2002 found what he believes was the leftover Saturn V third stage from 1969鈥檚 Apollo 12, the second moon landing by NASA astronauts. He acknowledges the evidence was circumstantial, given the object鈥檚 chaotic one-year orbit around Earth. It never was designated as an asteroid, and left Earth鈥檚 orbit in 2003.
The latest object鈥檚 route is direct and much more stable, bolstering his theory.
鈥淚 could be wrong on this. I don鈥檛 want to appear overly confident,鈥� Chodas said. 鈥淏ut it鈥檚 the first time, in my view, that all the pieces fit together with an actual known launch.鈥�
And he鈥檚 happy to note that it鈥檚 a mission that he followed in 1966, as a teenager in Canada.
Asteroid hunter Carrie Nugent of Olin College of Engineering in Needham, Massachusetts, said Chodas鈥� conclusion is 鈥渁 good one鈥� based on solid evidence. She鈥檚 the author of the 2017 book 鈥淎steroid Hunters.鈥�
鈥淪ome more data would be useful so we can know for sure,鈥� she said in an email. 鈥淎steroid hunters from around the world will continue to watch this object to get that data. I鈥檓 excited to see how this develops!鈥�
The Harvard-Smithsonian Center for Astrophysics鈥� Jonathan McDowell noted there have been 鈥渕any, many embarrassing incidents of objects in deep orbit 鈥� getting provisional asteroid designations for a few days before it was realized they were artificial.鈥�
It鈥檚 seldom clear-cut.
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Last year, a British amateur astronomer, Nick Howes, announced that an asteroid in solar orbit was likely the abandoned lunar module from NASA鈥檚 Apollo 10, a rehearsal for the Apollo 11 moon landing. While this object is likely artificial, Chodas and others are skeptical of the connection.
Skepticism is good, Howes wrote in an email. 鈥淚t hopefully will lead to more observations when it鈥檚 next in our neck of the woods鈥� in the late 2030s.
Chodas鈥� latest target of interest was passed by Earth in their respective laps around the sun in 1984 and 2002. But it was too dim to see from 5 million miles (8 million kilometres) away, he said.
He predicts the object will spend about four months circling Earth once it鈥檚 captured in mid-November, before shooting back out into its own orbit around the sun next March.
Chodas doubts the object will slam into Earth 鈥� 鈥渁t least not this time around.鈥�
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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute鈥檚 Department of Science Education. The AP is solely responsible for all content.
Marcia Dunn, The Associated Press
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