A new comet, officially named C/2025 F2 (SWAN), is captivating astronomers and skywatchers alike. Discovered recently by an Australian amateur astronomer, Michael Mattiazo, this bright green comet is expected to be visible from the UK in the coming weeks. Whether you’re a seasoned stargazer or a casual observer, this is an exciting opportunity to witness a celestial wonder.
The green comet was first detected after Michael spotted it in images captured by SWAN, an instrument aboard the European Space Agency’s SOHO spacecraft that monitors the Sun. The comet was initially nicknamed SWAN25F, before it received its official designation from the Minor Planet Center.
What makes SWAN unique is its distinctive bright green glow, which is caused by a compound called diatomic carbon. This compound emits green light when exposed to sunlight, giving the comet its stunning appearance.
While new comets are often faint and hard to spot, the comet has already surprised astronomers with its brightness, the Manchester Evening News reports. At the time of its discovery on April 1, 2025, the comet was shining at a magnitude of +10, which is quite bright for a newly spotted comet. For reference, the higher the number on the stellar magnitude scale, the dimmer the object. Venus, one of the brightest objects in the night sky, shines at a magnitude of -4.
Astronomers are excited because the comet is rapidly brightening as it hurtles towards the Sun. It is expected to reach a magnitude of +4 at its brightest, on May 1, making it visible to the naked eye under ideal dark sky conditions.
The comet is currently visible in the northern hemisphere, and UK skywatchers have already begun to spot it. The comet is particularly visible during the early morning hours before dawn, when the sky is darkest. One dedicated skywatcher, Josh Dury from Somerset, captured breathtaking images of the green comet on April 9 using multiple exposures.
Although the comet is brightening, it is still somewhat faint at its current magnitude of +8. This means it’s best viewed through binoculars, which will provide a clearer view of its green glow. While the comet is too dim to see with the naked eye right now, it will soon reach a magnitude of +4, at which point it will be visible without binoculars in dark sky areas.
For those eager to catch a glimpse of SWAN, it’s best to find a location away from light pollution, such as the countryside or a dark-sky reserve, for the clearest view. Be sure to check the forecast for clear skies, as cloud cover can obstruct your view of this magnificent comet.
The green comet C/2025 F2 (SWAN) is rapidly brightening as it moves towards the Sun, and UK skywatchers can look forward to seeing this stunning celestial object in the coming weeks. While it’s still faint, binoculars will offer the best view at the moment. As it reaches its brightest magnitude of +4, the comet will be visible to the naked eye. Don’t miss the opportunity to witness this extraordinary astronomical event!