This is the 50th<\/sup> known asteroid to fly past Earth within 1 lunar distance since the start of the year. It is also the 3rd<\/sup> closest so far this year and the 7th<\/sup> closest over the past 12 months.<\/p>\n 2025 HH was first observed at Catalina Sky Survey, Arizona, on April 18 \u2014 about 9 hours after it made a close approach to our planet.<\/p>\n The object belongs to the Aten group of asteroids and has an estimated diameter between 1.9 and 4.2 m (6.2 \u2013 13.8 feet).<\/p>\n The Aten asteroid group is a class of near-Earth asteroids characterized by orbits that bring them close to or across Earth\u2019s path around the Sun. These asteroids have a semi-major axis of less than 1 AU, meaning their average distance from the Sun is shorter than Earth\u2019s, but their aphelion extends beyond 0.983 AU, allowing them to cross Earth\u2019s orbit.<\/p>\n This group includes objects that are often difficult to detect due to their position relative to the Sun, frequently remaining in the daylight sky from Earth\u2019s perspective.<\/p>\n Their Earth-crossing trajectories and proximity to our planet categorize some members of the group as potentially hazardous.<\/p>\n References:<\/p>\n![\"asteroid](\"https:\/\/watchers.news\/wp-content\/uploads\/2025\/04\/asteroid-2025-hh-flyby-bg.webp\")