Magnitude measurements from observatories and astronomical organizations

Comet C/2023 A3 (Tsuchinshan-ATLAS) with Magnitude -4.0 Approaches Closest Point to Earth on October 12, Visible After Sunset

Oct 12, 2024, 03:23 PM

Comet C/2023 A3, also known as Tsuchinshan-ATLAS, is expected to make its closest approach to Earth on October 12, 2024, marking a significant astronomical event as it has not been visible for approximately 80,000 years. The comet, which has reached an observed magnitude of -4.0, making it brighter than Venus, will be visible to the naked eye in the western sky after sunset, particularly in the Northern Hemisphere. Observers are encouraged to look for the comet about 30 to 45 minutes after sunset, as it will gradually rise higher in the sky through the end of October. This event is being described as a once-in-a-lifetime opportunity for sky-gazers, with the comet expected to remain visible for several weeks, although it will dim slightly each night. The comet's appearance is anticipated to be spectacular, with a long tail becoming more visible as it approaches Earth. The best viewing conditions require clear skies and a good view of the western horizon.