Comet Tsuchinshan-Atlas, discovered in February 2023, is currently passing through our solar system, becoming visible with the naked eye as it approaches the Sun. Expected to reach its peak brightness on September 27, it will be best seen in the mornings of September 29 and 30, just before sunrise. Observers are encouraged to find dark locations free of light pollution for optimal viewing. The comet will become faint after September 30 but may reappear around October 12.
The appearance of a comet is a unique phenomenon, particularly when it is visible to the naked eye. Identified in February 2023, comet Tsuchinshan-Atlas is presently moving through our inner solar system, charting an unseen path that will bring it closest to the Sun this weekend, creating a visual display observable with basic binoculars or even just the eyes.
This small celestial object, composed of rock and ice, has not yet had its size precisely determined and follows a long-period orbit. According to astronomers, its last interaction with our solar system occurred around 80,000 years ago. Historical records do not mention if the Neanderthals inhabiting Europe were able to see its earlier pass.
Where to find it in the night sky?
Known scientifically as C/2023 A3, the comet is projected to reach peak brightness this Friday, September 27, coinciding with its perihelion, the point at which it is nearest to the Sun. As it approaches our star, the ice in its core transforms into gas, forming a long trail of dust that reflects sunlight.
This luminous tail is what we can observe from our planet. In our region, it should be visible in the sky during the hour leading up to dawn, for four consecutive mornings, until September 30. The comet will be positioned a few degrees above the east-southeast horizon.
Our recommendations to ensure you don’t miss the view!
The mornings of September 29 and 30 will provide the best viewing opportunities, as the Moon’s brightness will be diminished. The actual brightness of the comet remains uncertain, although some astronomers speculate it may shine as brightly as the 20 most luminous stars in the night sky.
Once you locate it, remember to tuck your phone away, allowing your eyes to adjust to the darkness so they can capture as much of the comet’s light as possible. Bringing binoculars along could enhance your viewing experience of the comet.
Even though the comet Tsuchinshan-Atlas can be seen on the outskirts of large cities, the optimal viewing conditions are in areas free from light pollution and with an unobstructed horizon. As of now, France is home to five dark sky reserves; you can find a full list by clicking here (new window).
After September 30, the comet will be obscured by the Sun’s brightness, but it will reappear in the night sky near the western horizon around October 12. On that date, comet Tsuchinshan-Atlas will be at its closest distance to Earth, only 70 million kilometers away, and it may present one last opportunity for observation!