The meteor’s high velocity is what initially caught Siraj’s eye. Siraj decided to go through NASA’s Center for Near Earth Object Studies database to find other interstellar objects and found what he believed to be an interstellar meteor within days. Siraj was investigating ʻOumuamua, the first known interstellar object in our solar system that was found in 2017, with Abraham Loeb, professor of science at Harvard University. The finding came as a surprise to Amir Siraj, who identified the object as an interstellar meteor in a 2019 study he coauthored while an undergraduate at Harvard University. Massive comet will swing by the sun in 2031, Hubble observes NASA/ESA/Man-To Hui (MUST)/David Jewitt (UCLA) The nucleus area is gleaned from radio observations. The nucleus is estimated to be as black as charcoal. Its size is derived from its reflectivity as measured by Hubble. ![]() Though the nucleus is estimated to be as large as 85 miles across, it is so far away it cannot be resolved by Hubble. That's no small feat from something 3 billion miles away. Combined with radio telescope data, astronomers arrived at a precise measurement of the nucleus size. This allowed for the coma to be subtracted, unveiling the point-like glow from the nucleus. ![]() A model of the coma (middle panel) was obtained by means of fitting the surface brightness profile assembled from the observed image on the left. On the left is a photo of the comet taken by the NASA Hubble Space Telescope's Wide Field Camera 3 on January 8, 2022. This sequence shows how the nucleus of Comet C/2014 UN271 (Bernardinelli-Bernstein) was isolated from a vast shell of dust and gas surrounding the solid icy nucleus.
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