A meteor shower Geminídeasreaches its peak of activity in the early morning between December 13th and 14th, 2025. Esse phenomenon, considered one of the most intense of the year, can produce up to 150 meteors per hour in places with dark skies.
Observation conditions are favorable due to the Lua in the waning crescent phase, which rises late and allows hours of prolonged darkness. No Brasil, the radiant in the constellation of Gêmeos rises high in the sky, facilitating visibility throughout the territory.
- Move away from urban areas to reduce light pollution.
- Watch from 10pm, with a peak around 2am.
- Use eyes only, no optical equipment.
- Wear appropriate clothing for the cold at night.
Meteors appear close to the stars Castor and Pólux, but cross any part of the sky. Júpiter, bright in the same region, serves as a reference to locate the point of origin.
Origin of Geminídeas
The Geminídeas differ from other rains due to their origin on the asteroid 3200 Phaethon. Esse rocky body leaves a trail of debris that Terra crosses annually.
The rate of meteors has increased in recent decades, rising from 50 to as many as 150 per hour in ideal conditions. The streaks are slow, bright and often colorful, with yellowish tones.
In Brasil, regions Norte and Nordeste offer higher rates due to the favorable position of the radiant.
Practical observation tips
Choose elevated or rural locations for better visibility. Adapte the eyes in the dark for at least 20 minutes before starting.
Observation is possible with the naked eye, covering a wide field of sky. Deite Sit comfortably and direct your gaze towards the zenith.
In suburban areas, expect about 50 to 80 meteors per hour. The phenomenon remains active until December 17th, with reduced activity after the peak.
Interstellar comet 3I/ATLAS
Comet 3I/ATLAS, the third confirmed interstellar object, reaches its closest approach to Terra on December 19, 2025. The safe distance reaches 270 million kilometers.
Discovered in July 2025, it exhibits a greenish coma and increasing activity. Sua hyperbolic trajectory confirms origin outside of Sistema Solar.
Observations require telescopes as it is not visible to the naked eye.
Other December events
The month offers long nights in the Hemisfério Sul, ideal for deep skies. The solstice occurs on December 21st, marking the beginning of summer.
Ursídeas peaks on December 22, with up to 10 meteors per hour. Planetas like Júpiter dominate the night sky, while Saturno appears at dusk.
Lua Nova around December 20 favors additional observations.
Best dates for the night sky
December brings together varied phenomena for enthusiasts. The nights after the Geminídeas peak remain rich in sporadic meteors.
Locations with low humidity, such as inside the Nordeste, minimize atmospheric interference. Apps of astronomy help identify constellations and planets.
The month ends with opportunities to record long exposure images.
Planets visible in the period
Jupiter stands out as the brightest point after the setting of Sol. Sua proximity to the Geminídeas radiant helps in localization.
Saturn remains visible in the west in the early evening. Mercúrio appears briefly at dawn in parts of Hemisfério Norte.
Venus approaches superior conjunction in January 2026.
