Comet Tsuchinshan-ATLAS (C/2023 A3), which has garnered much attention in 2024, remains visible in the night sky, but its brightness is gradually fading. The comet reached its closest approach to Earth on October 12, 2024, coming within 0.47 astronomical units (AU) or approximately 71 million kilometers (44 million miles). At this time, it was visible to the naked eye, with a peak magnitude between 0 and 1.7, making it one of the brightest comets of the year
Current Visibility: October 14–20
Throughout mid-October, from the 14th to the 20th, Comet Tsuchinshan-ATLAS remains an exciting target for observers. During this period, it continues to shine brightly, with a magnitude between 0.5 and 1.7, comparable to notable past comets like NEOWISE. Observers in both the Northern and Southern Hemispheres can spot the comet after sunset, particularly in the constellation Serpens. It appears roughly an hour after sunset, but darker skies and lower light pollution significantly enhance visibility
Dimming After October 20
After October 20, the comet will continue to be visible, but with diminishing brightness. Its magnitude will drop to between 1.9 and 3.9 as it moves across the constellation Ophiuchus in the southwestern evening sky. By the end of the month, binoculars or a telescope will be necessary to view it clearly. While it may be a challenge to see with the naked eye due to its fading brightness and the interference of the waxing Moon, stargazers with the right equipment can still track its journey
November and Beyond
As the comet moves farther from Earth in November, its brightness will decline further, ranging from magnitude 4 to 8. It will still be observable through binoculars and telescopes, especially in the Northern Hemisphere after sunset. By December, however, its brightness will reduce to between magnitude 8 and 10, and it will become less prominent in the night sky. The comet will eventually become too faint for the naked eye by the end of the year
How to Spot Comet Tsuchinshan-ATLAS
To catch a glimpse of Comet Tsuchinshan-ATLAS in its remaining visible weeks, look to the western horizon shortly after sunset. A good view of the horizon and minimal light pollution will greatly improve your chances. While binoculars or telescopes will offer the best viewing experience, naked-eye observations are still possible under ideal conditions until late October
In conclusion, while Comet Tsuchinshan-ATLAS remains visible, its days of prominence are numbered as it dims throughout November and December. For those eager to witness this celestial spectacle, now is the best time to enjoy the show.
