Asteroid 1998 SH2 may be a "dark comet" — a threat to Earth?

The object 1998 SH2, catalogued as a standard asteroid since 1998, displayed orbital anomalies during its close approach in August 2025, triggering a new series of analyses. Scientists now suspect it may be a so-called dark comet — an object with comet-like activity but no visible coma or tail. The finding forces a rethink of how Earth-threat assessments are made for similar objects.