Astronomers Seek Your Help in Hunting for Asteroids

The task for the amateur asteroid hunter: Decide if the identified speck of light in the images looks like a genuine celestial body or, rather, is a false detection resulting from inconveniently timed “twinkles” of the star-studded background, dust on the telescope mirror or other causes. After answering by clicking a “yes” or “no” button, the participant can either write a comment or move on to the next detection.

It is not necessary that people know the correct answer every time, said Catalina Sky Survey director Eric Christensen. Rather, the system relies on strength in numbers.

“With enough people participating, you can establish a general consensus, so there’s less margin of error.” Christensen said.

The Catalina Sky Survey operates up to five large, powerful telescopes each night in their quest to keep track of over 1 million lumps of flying rock with diameters ranging from the length of a school bus to the width of Arizona. Initially, the images in the portal will come from their G96 telescope atop Mount Lemmon, just north of Tucson. The diameter of the telescope’s primary mirror is approximately 5 feet, and it can usually survey the whole Northern Hemisphere night sky in about a month.

“The number of asteroids we detect per night with our telescope really depends on the weather or where we are in the lunar calendar,” Christensen said. “On clear nights, the database matches tens of thousands of candidates to known asteroids based on their motion, speed and position in the sky.”

While the lab’s software detects and records all asteroid sightings, Catalina Sky Survey is a NASA-funded project with the mission of specifically tracking and discovering near-Earth objects, or NEOs. NEOs are asteroids that have strayed from the flock of space rocks plodding around the sun in the asteroid belt between Mars and Jupiter. Their new orbits take them much closer to Earth, and some pose a potential threat if their orbit crosses that of Earth.

More than 14,400 NEOs in the past 30 years – almost half of the entire known population of nearly 32,000 – have been discovered by the Catalina Sky Survey. Of those, 1,200 were found just in the past year.

“We are most interested in candidates that are moving fast with an unknown identity because they are most likely to be NEOs,” Fuls said. “Because NEOs are closer to us, they appear to move faster and in somewhat random directions from our viewpoint compared to main belt asteroids.”

The process of spotting a new NEO and reporting it is time sensitive, and astronomers can lose track of them if there is no immediate follow-up on their discovery. That’s because NEOs have highly elliptical orbits that only bring them close to Earth every three or four years. Plus, some smaller NEOs can only be detected if they are passing near Earth. 

“NEOs move so erratically that it’s easy to miss them,” Christensen said. “We try not to filter out false detections too aggressively because this could also filter out some NEOs.”

Currently, the asteroid-tracking telescope on Mount Lemmon is set up to take about 1,000 images per night. Afterwards, sensitive software ranks detected moving objects from most to least likely to be an asteroid. The final step is for a human observer to analyze the detections that the software identified.  

“A human can only process so many images a night,” said Fuls, explaining that while the software flags many possible objects, the researchers don’t have the time and resources to look through everything that was picked up. “We are missing a certain number of objects because they simply didn’t rank high enough in the algorithm.”

That is where a Zooniverse account comes in handy, as “citizen scientists” peek through sky photos that the software flagged but weren’t obvious enough to make the cut. For each set of images, a participant must decide: Did the software pick up on a never-before seen space object or did it just get confused by the flickering stars?

Already, three citizen scientists have discovered 64 possible candidates for unknown asteroids during the testing phase of the web portal.

“We’ve sent these detections off to the Minor Planet Center as potential new discoveries, and most of these objects have not yet been linked to any object that has been detected before,” Fuls said. “We anticipate that there will be many more discoveries like that going forward.”

The Catalina Sky Survey astronomers plan to release new data into the interface every day after their scheduled nighttime viewing session.

“The observations made by these citizen scientists may not always be of a never-before-detected object,” Christensen said. “But they may still be key observations that allow the Minor Planet Center to nail down the identity of something that, until now, was just a candidate.”

To keep prospective asteroid hunters on their toes, Fuls said, he and his colleagues will throw pictures of already known objects into the mix to test people’s ability to identify real objects and keep them engaged.

“Even when you’re at the telescope, you perk up when you see one of those,” Fuls said. “You don’t want it to be mindless and boring.”

Kylianne Chadwick is a NASA Space Grant Science Writing Intern, University Communications, at the University of Arizona. The article was first published on the website of the University of Arizona.