The Geminidas meteor shower, considered the most intense of the year, reaches its peak of activity on the night of Saturday (13) to the early hours of Sunday (14 December). The phenomenon, partially visible across the entire Brazilian territory, can record rates of up to 150 meteors per hour in ideal dark sky conditions and without significant lunar interference.
Experts indicate that the radiant, the point where the meteors appear to originate, is located in the constellation Gêmeos. The activity began on December 4th and lasts until December 20th, but the peak concentrates the greatest amount of light traces in the sky.
- Asteroid 3200 Phaethon is the source of the debris that generates Geminidas.
- Unlike other rains, this one does not come from a comet.
- Meteors enter the atmosphere at about 35 km/s, producing bright, colorful trails.
Initial recordings occurred at Rio Grande of Sul, with captures at Nova Santa Rita.
Origin of the phenomenon
The Geminidas differ from other meteor showers due to their origin in an asteroid, 3200 Phaethon, discovered in 1983. The Esse celestial body leaves a trail of rocky particles that the Terra crosses annually in December. The particles collide with the Earth’s atmosphere, generating the luminous traces popularly known as shooting stars.
The name Geminidas refers to the constellation of Gêmeos, from which the meteors appear to radiate. Ambas the forms “Geminids” and “geminids” are accepted in the Portuguese language.
The last meteor shower of the year, the Geminids, will reach its maximum point on the nights of the 13th and 14th of December. 🔭
— NASA en español (@NASA_es)December 12, 2025
The Geminids are known for being bright and colorful, and come from the debris left behind by the asteroid 3200 Faetón.pic.twitter.com/SRRmcOW3sl
Observation conditions in 2025
This year, the waning lunar phase favors visibility, with Lua rising after midnight in many regions. Isso keeps the sky darker in the early hours of the night, ideal for sightings. The broad peak, lasting about 12 hours, allows observations on the nights before and after the maximum.
Interference from Lua mainly affects the fainter meteors in the second half of the night. Cerca 30% of Geminidas are bright, facilitating recordings even in less than perfect conditions.
Best times and locations
The recommended period starts after 10pm, extending until dawn. Nas nights of the 13th and 14th, prioritize the interval between 10pm and 2am, when the radiant is high and the Lua is low on the horizon. Locais far from urban centers, with a clear horizon and low light pollution, the chances of sightings increase.
No optical equipment is required as meteors are visible to the naked eye. Posicione Sit comfortably, like in a reclining chair, and use your peripheral vision to capture movement in the wide sky.
Avoid artificial light sources during observation. Permita that the eyes adapt to darkness for at least 15 minutes.
Predictions by region in Brasil
Hourly rates vary depending on latitude and local conditions. No Sul, like Rio Grande of Sul, estimates point to around 35 to 50 meteors per hour in an ideal sky. Regiões Norte and Nordeste can register up to 80 or more due to the radiant’s higher position.
- Grande River from Sul: up to 35-50 meteors/hour.
- There are Paulo: around 46 meteors/hour.
- Amazon regions: rates above 80/hour.
- Margin of error in projections: approximately 15%.
The presence of clouds represents the main obstacle, common in December in Brasil.
Practical tips for sighting
Choose rural areas or remote beaches to minimize urban lighting. Direcione look at the region close to Três Marias, but explore the entire sky, as meteors appear in different directions. Mantenha patience, observing for at least an hour for satisfactory results.
Geminidas produce meteors of moderate speed, often with yellow, green or orange colors. Alguns leave persistent trails visible for seconds.
Unique characteristics of the Geminidas
This rain stands out for the number of bright meteors and its asteroidal origin, rare among similar events. The density of the debris mat ensures high intensity year after year. Observadores experts report actual averages of between 80 and 120 meteors per hour in favorable years in Hemisfério Sul.
The phenomenon is harmless, consisting of small particles that disintegrate in the atmosphere.
Regional variations and expectations
At Hemisfério Sul, the radiant rises higher than at Norte, raising the rates visible at Brasil. Estados like Ceará and Amazonas offer strategic positions. In capitals, move to outskirts or interiors for better results.
Prolonged activity allows for multiple attempts until mid-December.
Logging and monitoring
Projects like Exoss and international networks capture the first meteors annually. Imagens and Nova Santa Rita confirm the start of the season in 2025. Observações contribute to studies on trajectories and compositions.
Rain remains reliable, regardless of annual climate variations.
