Asteroids in the Amor group may come very close to Earth, closer than any other asteroid group, and there have been several close encounters with Amor asteroids in the past, including one with asteroid Toutatis that passed only 1.5 lunar distances (about 580,000 kilometres) from Earth in 2004. While these close approaches are rare, they do pose a risk to Earth if an asteroid were to impact the planet.
However, the Amor group of asteroids is only one of many groups that pose a threat to Earth. There are also the Aten asteroids, which are Earth-crossers that have orbits entirely within Earth's orbit; the Apollo asteroids, which are Earth-crossers that have orbits that extend beyond Earth's orbit; and the Trojan asteroids, which share Jupiter's orbit around the Sun. All of these groups of asteroids pose a risk to Earth, and it is impossible to say definitively which group is the greatest threat.
What can be said is that the Amor asteroids are some of the most well-known and closely studied asteroids because of their potential to impact Earth, and astronomers are constantly monitoring them for any potential hazards.
