Tag Archives: interstellar objects

New image of Comet 2I/Borisov

Comet 2I/Borisov
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Astronomers have taken a new image of the interstellar comet 2I/Borisov. The photograph to the right is that image, with the Earth placed alongside to show scale.

According to van Dokkum the comet’s tail, shown in the new image, is nearly 100,000 miles long, which is 14 times the size of Earth. “It’s humbling to realize how small Earth is next to this visitor from another solar system,” van Dokkum said.

Laughlin noted that 2l/Borisov is evaporating as it gets closer to Earth, releasing gas and fine dust in its tail. “Astronomers are taking advantage of Borisov’s visit, using telescopes such as Keck to obtain information about the building blocks of planets in systems other than our own,” Laughlin said.

The solid nucleus of the comet is only about a mile wide. As it began reacting to the Sun’s warming effect, the comet has taken on a “ghostly” appearance, the researchers said.

The comet will reach its closest point to the Earth, 190 million miles, in early December.

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Hubble snaps photo of Comet Borisov

Comet Borisov by Hubble
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Cool image time! Using the Hubble Space Telescope astronomers have snapped the best image so far of interstellar Comet Borisov. The image to the right, reduced and cropped to post here, is that photograph.

Comet 2I/Borisov is only the second such interstellar object known to have passed through our Solar System. In 2017, the first identified interstellar visitor, an object dubbed ‘Oumuamua, swung within 38 million kilometres of the Sun before racing out of the Solar System. “Whereas ‘Oumuamua looked like a bare rock, Borisov is really active, more like a normal comet. It’s a puzzle why these two are so different,” explained David Jewitt of UCLA, leader of the Hubble team who observed the comet.

The comet was 260 million miles away when Hubble took this picture.

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Comet Borisov is now 2I/Borisov

Because the comet that amateur astronomer Gennady Borisov discovered in August is actually the second interstellar object ever discovered that is entering the solar system, the International Astronomical Union (IAU) has decided to dub it 2I/Borisov, honoring its discoverer as is traditional with comets but indicating its interstellar nature in the name.

The orbit is now sufficiently well known, and the object is unambiguously interstellar in origin; it has received its final designation as the second interstellar object, 2I. In this case, the IAU has decided to follow the tradition of naming cometary objects after their discoverers, so the object has been named 2I/Borisov.

As my regular readers know, I am not a fan of the IAU’s effort to claim the right to name every object in the universe. In this case it has at least made the proper decision.

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