1 day / second

0.5 AU

101955 Bennu

Asteroid

A small, diamond-shaped near-Earth asteroid with a dark, boulder-strewn surface that rotates every 4.3 hours and has a small chance of colliding with Earth in the late 22nd century.

Key Facts

orbital regime

Inner System

learn more

Wikipedia

mass

7.3290e+10 kg

radius

0.245 km

hill radius

30.958 km

semi-major axis

1.126 AU

eccentricity

0.204

inclination

6.035º

longitude of the ascending node

2.061º

argument of periapsis

66.223º

orbital period

1.195 years

discovery date

September 11, 1999

discovered by

Lincoln Near-Earth Asteroid Research (LINEAR)

name origins

Named after Bennu, an ancient Egyptian deity

dimensions

484.44 meters diameter

albedo

0.044

material composition

B-type asteroid (primitive and carbon-rich)

density

1.194 g/cm³
Gallery
Spacecraft Visits
OSIRIS-REx

Orbiter

NASA

Launched in 2016, entered orbit in 2018

OSIRIS-REx orbited asteroid Bennu from December 2018 to May 2021, mapping its surface in detail and successfully collecting a sample from the Nightingale crater site before beginning its return journey to Earth.

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