Comet Tsuchinshan-Atlas, discovered in February 2023, is making its rare appearance in the inner solar system. It will reach its closest point to the Sun this weekend, making it visible to the naked eye and binoculars. Best viewing times are the mornings of September 29 and 30, when the comet may shine brightly just before sunrise. After its peak visibility, it will reappear near the western horizon around October 12, offering a final chance to observe it.
Experiencing a comet’s passage is a rare and breathtaking occurrence, especially when it’s visible to the naked eye. Comet Tsuchinshan-Atlas, discovered in February 2023, is now traversing the inner solar system on a journey that will bring it remarkably close to the Sun this weekend, creating a visual treat that can be enjoyed with just binoculars or even without any equipment.
This intriguing small celestial body, composed of rock and ice with an unknown precise size, follows a long-period orbit. According to astronomers, its last close approach to our Sun occurred roughly 80,000 years ago. While we can only speculate, there is no recorded evidence to confirm whether Neanderthals roaming Europe at that time witnessed its prior transit.
Finding the Comet in the Night Sky
Known scientifically as C/2023 A3, the comet is anticipated to reach peak brightness on Friday, September 27, coinciding with its perihelion—the point of closest approach to the Sun. As comets draw near the Sun, the frozen components in their cores sublimate, creating a luminous tail of dust that reflects sunlight.
This stunning tail is what will be visible from our planet. In many regions, it should be possible to catch sight of the comet during the hour before dawn over four consecutive mornings, culminating on Monday, September 30. On these days, it will be positioned a few degrees above the east-southeast horizon.
Tips for Optimal Viewing
The best chances for observing the comet will be on the mornings of September 29 and 30, as the Moon will be less bright. While the comet’s luminosity remains uncertain, some astronomers speculate it could shine as brightly as the top 20 stars visible in the night sky.
Once you locate the comet, it’s advisable to put away your phone to allow your eyes to adapt to the darkness, enhancing your ability to see the comet’s light. Bringing binoculars along can also significantly improve your viewing experience.
Though comet Tsuchinshan-Atlas can be observed from the outskirts of major urban areas, the ideal conditions for viewing are in locations with minimal light pollution and an unobstructed horizon. France features five designated dark sky reserves, which you can explore by clicking here (new window).
After September 30, the comet will fade into the Sun’s brightness but is expected to resurface in the night sky near the western horizon around October 12. On that date, comet Tsuchinshan-Atlas will be at its closest point to Earth, just 70 million kilometers away, giving observers a final opportunity to witness its beauty once more!