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C/2014 UN 271 is the second-largest known comet, being only behind 95P/Chiron. Radio thermal emission measurements by the Atacama Large Millimeter Array (ALMA) in 2021 estimate a maximum diameter of 137 ± 17 km (85 ± 11 mi) for C/2014 UN 271 's nucleus , assuming negligible contamination of the nucleus's thermal emission by an unseen dust ...
The comet was discovered in the constellation of Equuleus by Father Nicolas Sarabat, a professor of mathematics, at Nîmes in the early morning of August 1, 1729. [7] At the time of discovery the comet was making its closest approach to Earth at a distance of 3.1 AU (460 million km; 290 million mi) and had a solar elongation of 155 degrees.
As space objects go, comets and meteors are not very big. While a planet like Earth is about 8,000 miles in diameter and a star like our Sun is about 865,000 miles across, the largest asteroid ...
Fortunately, it won't come within a billion miles of Earth. Named Comet Bernardinelli-Bernstein, it was perhaps the largest comet ever detected, likely some 10 times larger than the 6-mile-wide ...
The space agency said it’s the biggest comet nucleus ever recorded with an estimated diameter of 80 miles and overall bigger than the state of Rhode Island.
The comet entered SOHO's LASCO C3 camera's field of view on 12 January, [9] and was viewable on the web in near real-time. The comet left SOHO's field of view on 16 January. [9] Due to its proximity to the Sun, the Northern Hemisphere ground-based viewers had a short window for viewing, and the comet could be spotted only during bright twilight.
It is estimated to be between 60 and 230 miles wide, which could make it the largest comet ever discovered, EarthSky said. To put the size in context, Halley's Comet is about 3.5 miles wide, Long ...
C/2018 Y1 (Iwamoto) is a long period comet with a retrograde orbit discovered on December 18, 2018, by Japanese amateur astronomer Masayuki Iwamoto. [1] Its period is estimated to be 1,733 years. It passed closest to Earth on February 13, 2019. [ 3 ]