Light pollution may spoil Bengaluru’s view of rare 3I/ATLAS comet on December 19

Despite a moonless night and clear winter skies, city lights threaten chances of spotting the rare interstellar comet as science centres weigh public viewing plans.

As the world prepares to witness the rare 3I/ATLAS comet during its closest approach to Earth on December 19 (Friday), Bengaluru faces a major challenge that could dampen public excitement, severe light pollution.

Several science and astronomy centres in the city are still undecided about hosting public viewing sessions. While observing the comet from Bengaluru is not completely ruled out, experts say the chances of a clear sighting remain low due to the city’s intense artificial lighting.

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The 3I/ATLAS comet has drawn global attention since July 2025. It is only the third interstellar object ever detected entering the Solar System, making it an exceptionally rare astronomical event. Scientists have also noted its unpredictable behaviour, setting it apart from conventional comets and further increasing curiosity among astronomers and the general public alike.

Under normal circumstances, December 19 would offer ideal viewing conditions. The night will be moonless, and Bengaluru usually experiences clear skies during winter. These factors typically create a perfect environment for observing faint celestial objects.

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However, Bengaluru is among the brightest metropolitan cities in India, and its heavy light pollution may overpower the faint glow of the comet. Astronomers compare this effect to trying to drive at night with the car’s cabin lights switched on, the surrounding glare makes it difficult to see clearly.

Both VITM and the Jawaharlal Nehru Planetarium (JNP) have scheduled trial observations on December 18. Based on the results, they will decide whether public viewing sessions can be organised in Bengaluru.

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