Auburn professor using Hubble Space Telescope to observe comet passing Earth

December 18, 2018 @ 8:18 a.m.

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One of the closest comets in modern times is passing by Earth – but don’t worry, there’s no danger of it hitting us. It will come relatively close in scientific terms – seven million miles away. For the average person, the comet will be visible with the naked eye and will provide a rare sky-watching event. For researchers, the proximity of the Comet 46P/Wirtanen to earth will offer a chance to collect data on comets and learn more about the building blocks of the solar system.

Auburn University researcher and astrophysicist Dennis Bodewits will perhaps get the best view of all. He’s been awarded time to simultaneously use three of NASA’s telescopes during the comet event: the Hubble Space Telescope, the Chandra X-ray Observatory and the Neil Gehrels Swift Observatory. He will be researching what ices make up the comet and how chemical processes change the gas around it.

“These observations are like a space mission in reverse because the comet flies by us,” Bodewits said.

Bodewits said this sky-watching event will provide important context to the Rosetta and Deep Impact missions. In the Deep Impact mission, NASA launched a space probe in 2005 to study the interior of a comet by releasing an impactor that collided with the comet’s nucleus to emit material from below its surface. It continued its journey through the solar system to snap detailed pictures of a second comet, Hartley 2. Rosetta was a space probe built by the European Space Agency that followed comet Churyumov-Gerasimenko for more than two years around the Sun.

“Because the comet comes very close to Earth, we can investigate the inner 200 kilometers around the nucleus, a region we cannot resolve for most comets. The comet appears to be a close twin to comet Hartley 2, the second target of the Deep Impact mission. Hartley 2 puzzled astronomers because it releases much more gas than was expected from its size. Comparing two will allow us to learn more about how comet activity works,” Bodewits said.

Bodewits explained the Rosetta mission taught scientists more about the makeup of a comet’s nucleus and the origin of our solar system.

“It unexpectedly found a lot of molecular oxygen gas and discovered that electron collisions can change the comet gas,” he said. “These are both important because they inform us what ices made up the building blocks of our solar system, and how they were altered by light and radiation from the Sun.”

Because of the significance of this comet’s proximity for learning more about the solar system, Bodewits is using as many resources as he can to study it.

“We’re going to be observing Comet 46P/Wirtanen with as many telescopes as we can get our hands on,” he said. “The timing of this comet could not be better as our observations will allow us to apply all we learned from Rosetta to a completely different comet.”

Bodewits is also looking at another mission that could take NASA back to Rosetta's comet to learn even more. The proposed CAESAR mission (Comet Astrobiology Exploration Sample Return) is a space mission that will go back to Churyumov-Gerasimenko to bring comet material back to Earth so it can be analyzed in laboratories around the world.

BY MIRANDA NOBLES

Dr. Dennis Bodewits

Dennis Bodewits

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