Halloween asteroid will pass closer to Earth than the Moon

CATEGORY: astronomy

The asteroid 2025 UK9, a small body, will pass closer to Earth than the Moon in the early hours of October 31, 2026, according to ANSA — an event that is likely to attract observers and astronomy enthusiasts.

Passage of the asteroid 2025 UK9

The object identified as 2025 UK9 has an estimated diameter between 3 and 7 meters and is expected to make its closest approach around 03:35 (local time, according to ANSA) on Saturday, October 31, 2026. The estimated minimum distance for this pass is about 315,000 km, a value smaller than the average Earth–Moon distance, which is roughly 384,000 km.

Note: the term "local time" follows the source; the original ANSA article does not detail a specific time zone in its body. Additionally, the Earth–Moon distance varies (perigee ≈ 363,000 km, apogee ≈ 405,000 km), so comparing with the "average distance" is correct, but the variation should be kept in mind.

"Around 03:35 on 31 October 2026, 2025 UK9 should pass about 315,000 km from the Earth," according to ANSA.

Due to its small size, the asteroid does not pose a global impact risk, but satellites and the scientific community will monitor the event to gather data and images that improve orbital predictions.

Uncertainties and observations

There is uncertainty about both the exact time and the minimum approach distance. ANSA notes this occurs because 2025 UK9 has been observed only a few times so far, which limits the precision of the computed orbits. The small number of observations implies larger error margins in the orbital elements — a common situation for small asteroids newly discovered.

Astrophysicist Gianluca Masi, from the Virtual Telescope project, told ANSA that despite the small size, 2025 UK9 "promises the closest pass" among objects recorded for the period, highlighting the importance of coordinated observations to reduce uncertainty and obtain images. The Virtual Telescope usually streams such events in real time, when possible, and aggregates data from different stations for monitoring.

Next event: November 2

In addition to 2025 UK9, ANSA reports that a second, larger asteroid will have a close pass on November 2, 2026. This second object will be bright enough to be observed with amateur equipment in various locations, and the article notes that it will be visible also from Italy, according to predictions cited by consulted observatories.

The November 2 approach provides an extra opportunity to compare data between the two objects: while 2025 UK9 is very small and harder to characterize, the larger asteroid will allow more detailed observations of brightness, rotation, and spectrum, useful for studies on composition and trajectory.

Relevance for Brazilian audiences and descendants of Italians

Events like the passage of 2025 UK9 intrigue Raízes Italianas readers following science news and Italy-related topics. Beyond the scientific appeal, broadcasts and images produced by projects like the Virtual Telescope can be accessed online, allowing observers in Brazil to follow in real time when coverage is available.

Local visibility varies with geographic location and weather conditions: ANSA’s article mentions visibility from Italy for the November 2 event but does not guarantee universal visibility. Readers interested in broadcasts and observing guides can check astronomy sections on specialized portals or follow the Virtual Telescope on social channels and its official site.

Context and how to follow

• Observatories and projects like the Virtual Telescope often stream passes and provide images; check local schedules and times.
• Italian press coverage and agencies like ANSA provide updated information on times and distance revisions as new observations come in.
• For readers in Italy, also follow Notícias da Itália and local coverage; Brazilians in Italy can consult content on Vida na Itália related to public events and observatories.

This type of occurrence is routine from an astronomical perspective — small asteroids frequently cross Earth’s neighborhood — but each pass provides data valued by the scientific community. For readers who follow science and international culture, as well as topics of interest to Brazilians connected to Italy, broadcasts and reports make the phenomenon accessible.

Source: ANSA