Comet SWAN R2 is making its closest approach to Earth between October 12–19, 2025, shining possibly as bright as magnitude 5.8. With an estimated orbital period of 22,554 years, this is a once-in-a-lifetime sighting!
Bandar Seri Begawan – Discovered a week ago in September 2025 by the SWAN instrument aboard the SOHO spacecraft, Comet SWAN (C/2025 R2) is now visible from Brunei Darussalam shortly after sunset, low in the western sky near the constellation Virgo and near Mars.
It is currently barely visible to the eye with an apparent magnitude around +6 to +7. It may be glimpsed with binoculars or a small telescope, especially under dark-sky conditions away from city lights.
Comet C/2025 R2 (SWAN) presents a rare and extraordinary opportunity for observers in Brunei and around the world. Based on recent orbital calculations by NASA/JPL, this comet completes a revolution around the Sun approximately once every 22,554 years.
If the comet endures its solar passage, it is not expected to return until the year 24,579. According to the International Astronomical Union, its closest approach to Earth is anticipated between 12 and 19 October 2025.
Preliminary brightness estimates suggest it may reach magnitude 5.8, potentially making it visible with binoculars or digital imaging equipment under favourable conditions. However, as with all comets, its behaviour remains inherently unpredictable.
Photos by the Astronomical Society of Brunei Darussalam (PABD) on Sep 19, 2025, from Tutong, Brunei Darussalam.
