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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 space agency said it’s the biggest comet nucleus ever recorded with an estimated diameter of 80 miles. On the whole, it’s bigger than the state of Rhode Island. The object, known as C/2014 ...
Named Comet Bernardinelli-Bernstein, it was perhaps the largest comet ever detected, likely some 10 times larger than the 6-mile-wide object that pummeled Earth and triggered the dinosaurs ...
The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2] However, there is some uncertainty regarding its origins [ 3 ] and age, with some sources giving it as < 10 ka [ 2 ] [ 4 ] while the EID gives a broader < 100 ka.
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.
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 largest of these may have a hydrostatic-equilibrium shape, but most are irregular. Most of the trans-Neptunian objects (TNOs) listed with a radius smaller than 200 km have " assumed sizes based on a generic albedo of 0.09" since they are too far away to directly measure their sizes with existing instruments.
Comet 2014 UN271 was observed during a mission called the Dark Energy Survey back in 2014, but skywatchers didn't realize that the data gathered was showing a comet until mid-June of this year.