101955 Bennu has a mean diameter of 490 m (1,610 ft; 0.30 mi) and has been observed extensively by the Arecibo Observatory planetary radar and the Goldstone Deep Space Network. [5] [12] [13] Bennu was the target of the OSIRIS-REx mission that returned samples of the asteroid to Earth.

2020年10月16日 · Bennu, for contrast, is about as tall as the Empire State Building. It likely took just a few weeks for these shards of space wreckage to coalesce into the rubble-pile that is Bennu. Bennu is full of holes inside, with 20 to 40 percent of its volume being empty space.

2025年2月5日 · Bennu: Size And Chance Of Impact. Bennu is a medium-sized asteroid. According to NASA, Bennu is about one-third of a mile (half a kilometer) wide at its equator. That's far smaller than the six ...

2024年12月20日 · Size and Distance. At about one-third of a mile (half a kilometer) wide at its equator, Bennu is minuscule compared to the planets – in fact, it is only slightly wider than the height of the Empire State Building. By comparison, the smallest planet, Mercury, is more than 3,000 miles across.

2022年12月21日 · Bennu's size and orbit. Bennu is 1,614 feet (492 m) wide and has a fairly regular shape that looks a bit like a spinning top.

101955 Bennu has a mean diameter of approximately 492 m and has been observed extensively with the Arecibo Observatory planetary radar and the Goldstone Deep Space Network. Bennu is the target of the OSIRIS-REx mission, which arrived at Bennu on 3 December 2018.

2024年11月21日 · One astronomical unit is the distance between Earth and the Sun, equivalent to about 93 million miles. This series of images taken by the OSIRIS-REx spacecraft shows asteroid Bennu in one full rotation from about 50 miles (80 km).

2025年2月4日 · Bennu is about one-third of a mile wide at its equator. The rocks Bennu is made of formed nearly 4.6 billion years ago on a primeval world that has since been destroyed by a giant collision. Bennu coalesced from a small portion of the leftover rubble about 1 …

Bennu has a 1 in 2,700 chance of hitting Earth between the year 2175 and 2199. It is named after the Bennu, the ancient Egyptian mythological bird associated with the Sun, creation, and rebirth. Bennu has an average diameter of 492 metres (1,614 feet).

Scientists chose Bennu as the target of the OSIRIS-REx mission because of its composition, size, and proximity to Earth. Bennu is a rare B-type asteroid (primitive and carbon-rich), which is expected to have organic compounds and water-bearing minerals like clays.