A rare bright comet is set to grace the skies above the UK in the coming weeks, offering a remarkable celestial show for stargazers. The comet, known as Comet A3 but formally named C/2023 A3 (Tsuchinshan-ATLAS), was first discovered by the Tsuchinshan Observatory in China in January last year and later confirmed by Nasa’s Asteroid Terrestrial-impact Last Alert System (ATLAS).
This rare comet, composed of ice, rock, and gas, is expected to become increasingly visible as it moves closer to its peak brightness, with the best views anticipated in mid-October. While it has already been visible in the Southern Hemisphere, it is now the Northern Hemisphere’s turn to witness this astronomical phenomenon.
Astronomers are eagerly anticipating Comet A3’s brightening as it approaches its most visible stage. Robert Massey, deputy executive director of the Royal Astronomical Society, emphasised the rarity of bright comets, urging people to seize the opportunity to witness this spectacular event, even if binoculars are needed to observe its features.
The visibility of Comet A3 is expected to be best around mid-October, with two distinct periods recommended for viewing. In the upcoming week, the comet will be low in the eastern sky before dawn, possibly requiring telescopes or binoculars for observation. However, from around October 12 onwards, it is likely to be visible after sunset in the western sky, potentially without the need for visual aids.
As comets are known for their unpredictability, astronomers encourage the public not to miss this rare chance to witness Comet A3’s luminous display. While the brightness of the comet remains uncertain, the prospect of observing such a phenomenon is a unique and awe-inspiring opportunity for sky watchers in the UK.