NASA astronaut Matthew Dominick, currently orbiting Earth aboard the International Space Station (ISS), has recorded a remarkable time-lapse featuring Comet Tsuchinshan-ATLAS (C/2023 A3). This striking sequence, filmed from orbit, reveals the comet as it nears its closest point to the Sun, brightening enough to be seen with the unaided eye. Discovered earlier this year, the comet is rapidly gaining public and scientific attention due to its expected increasing brightness in the night sky.
Exclusive Perspectives from the ISS
Dominick’s footage presents a unique and captivating glimpse of Comet Tsuchinshan-ATLAS emerging over Earth’s horizon. Captured through the ISS’s cupola observation module, the video benefits from a vantage point offering both celestial and terrestrial views. In a message shared on X (formerly Twitter), Dominick remarked: "To the naked eye, the comet appears as a dim, fuzzy star from the cupola. Using a 200mm, f2 lens with a 1/8 second exposure enhances visibility significantly. This comet promises stunning visuals as it draws closer to the Sun. Here is a time-lapse preview for now."
So far Comet Tsuchinshan-ATLAS looks like a fuzzy star to the naked eye looking out the cupola windows. But with a 200mm, f2 lens at 1/8s exposure you can really start to see it. This comet is going to make for some really cool images as it gets closer to the sun. For now a… pic.twitter.com/JstaSLJ4Ui
Add Cosmo Herald as a Preferred Source— Matthew Dominick (@dominickmatthew) September 19, 2024
Although the comet remains faint when viewed without equipment, Dominick’s 200mm lens reveals its glowing coma and gaseous tail, capturing its trajectory as it nears perihelion—the closest orbital point to the Sun. This video complements an array of photos featuring auroras and meteor streaks, part of Dominick’s ongoing astrophotography work showcasing extraordinary phenomena visible only from orbit.
Origins and Characteristics of Comet Tsuchinshan-ATLAS
Comet Tsuchinshan-ATLAS was jointly discovered in January 2023 by China’s Tsuchinshan Observatory (also called the Purple Mountain Observatory) and the Asteroid Terrestrial-impact Last Alert System (ATLAS). Initially mistaken for an asteroid, further observations confirmed its cometary nature, with estimates placing its diameter between 1 to 2 kilometers. Its unusual retrograde orbit—traveling opposite to most planets—has sparked significant interest among astronomers monitoring its trajectory.
Scientists believe the comet originated in the Oort Cloud, a distant, icy sphere encasing our solar system, home to many long-period comets. Such objects may take millions of years to orbit the Sun. Comet Tsuchinshan-ATLAS is likely on a one-time pass into the inner solar system before it gets ejected back into interstellar space.
Rising Brightness and Visibility Prospects
Since its debut, the comet has become increasingly luminous. Initially detectable only with large telescopes, it grew brighter through 2024, reaching levels observable with medium-sized optics. As it nears perihelion on September 27, 2024, the comet has crossed into the realm of unaided-eye visibility.
Dominick’s space-based observations align with this progression. According to Dr. Alfredo Carpineti from IFLScience, "The comet has now reached a brightness that can be seen without telescopes," though from Earth it may still appear as a dim, fuzzy patch. Using binoculars or small telescopes allows viewers to appreciate its bright coma and distinctive tail. The optimal viewing period is predicted for early October, with the October 9th window especially favorable for skywatchers.
A Celestial Highlight in October
This comet’s journey presents a rare and compelling display for astronomy enthusiasts. Approaching the Sun, it may brighten to rival the luminosity of some of the brightest planets. Conservative estimates place Tsuchinshan-ATLAS among the 50 brightest sky objects, while more optimistic models suggest it could shine as vividly as Jupiter or even Venus.
Following perihelion, the comet continues its close approach on October 12, 2024, when it will come nearest to Earth. During this period, it may be observable near sunset in the Northern Hemisphere, promising a magnificent show. Astronomers remain vigilant for any breakup signs amid past concerns of potential disintegration near the Sun, but current data indicates the comet remains intact.
An Unforgettable Cosmic Event
Comet Tsuchinshan-ATLAS is poised to deliver a brilliant spectacle in the night sky over the next several weeks, but this opportunity will be short-lived. Given its orbital path, the comet is unlikely to return for millions of years, if ever. Dr. Carpineti emphasizes the rarity of the event, encouraging observers to take advantage: "We hope the comet brightens further during its passage… Watch the skies."
As it moves between the Sun and Earth, dust particles from the comet’s tail are expected to reflect sunlight, potentially causing a surge in brightness. Some astronomers predict that on October 9, this effect could make the comet one of the most prominent objects in the evening sky. No matter its final appearance, Comet Tsuchinshan-ATLAS’s journey is a once-in-a-lifetime astronomical occasion for 2024.
For those eager to witness this celestial visitor, October offers the prime opportunity as it passes near Earth before continuing its flight deep into space. Whether observed from ground-based locations or, for a privileged few, from space, this comet is set to be a standout feature in the year's cosmic events.
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