A new comet, designated C/2025 R2 (SWAN), is set to captivate stargazers as it approaches Earth in late October. Discovered on September 10, 2023, by Ukrainian amateur astronomer Vladimir Bezugly, this comet has gained brightness, raising anticipation that it may become visible to the naked eye around its closest approach on October 21, 2023.
As C/2025 R2 (SWAN) nears the sun, the heat causes frozen materials in its nucleus to undergo sublimation, transitioning directly from solid to gas. This process generates a gaseous shell, which is then propelled away by solar winds, forming a striking tail of dust and gas that can reflect sunlight. If conditions align favorably, observers on Earth will enjoy a spectacular view of this cosmic phenomenon.
The comet made its closest approach to the sun, known as perihelion, on September 12, passing approximately 47 million miles from the solar body, nearly half the average distance between Earth and the sun. Recent data from the Comet Observation Database (COBS) at the Crni Vrh Observatory in Slovenia indicates that C/2025 R2 (SWAN) currently has a brightness of magnitude 5.6. Under ideal dark conditions, it may be faintly visible to the naked eye, as human eyesight can detect objects with a magnitude lower than +6.
How to Spot Comet C/2025 R2 (SWAN)
C/2025 R2 (SWAN) can be observed in the evening sky throughout October, with optimal viewing times occurring shortly after sunset. As the comet descends toward the south-southwest horizon, it will be easiest to locate on October 16, when it is situated about five degrees above the star Xi Serpentis in the eastern part of the constellation Serpens. Stargazers can utilize mobile apps to assist in pinpointing the comet’s position relative to familiar stars.
The following week, C/2025 R2 (SWAN) will traverse above the iconic “teapot” asterism in the constellation Sagittarius, before moving through the stars of the constellation Scutum. By the end of October, this celestial body will be positioned above the southern horizon, nestled between the prominent stars Sadalmelik and Sadalsuud in the constellation Aquarius, with the half-lit moon illuminating the scene below.
Astronomy enthusiasts eager to catch a glimpse of C/2025 R2 (SWAN) are encouraged to explore recommendations for binoculars and telescopes that enhance night sky viewing. Additionally, those interested in capturing images of the comet can consult guides on astrophotography with DSLR cameras.
If you happen to photograph Comet C/2025 R2 (SWAN) and wish to share your experience with a wider audience, please send your images, comments, and details of your location to [email protected]. This celestial event promises to be a highlight for astronomy enthusiasts and casual observers alike as October unfolds.