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101955 Bennu
BennuAsteroid.jpg
Mosaic image of Bennu consisting of 12 PolyCam images collected on 2 December 2018 by OSIRIS-REx from a range of 24 km (15 mi).
Discovery
Discovered by LINEAR
Discovery site Lincoln Lab's ETS
Discovery date 11 September 1999
Designations
MPC designation (101955) Bennu
Pronunciation /bɛˈn/
Named after
Bennu
1999 RQ36
Apollo · NEO · PHA
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 13.36 yr (4880 days)
Aphelion 1.3559 au (202.84 Gm)
Perihelion 0.89689 au (134.173 Gm)
1.1264 au (168.51 Gm)
Eccentricity 0.20375
1.20 yr (436.65 d)
28.0 km/s (63,000 mph)
101.7039°
Mean motion
0° 49m 28.056s / day
Inclination 6.0349°
2.0609°
66.2231°
Earth MOID 0.0032228 au (482,120 km)
Venus MOID 0.194 au (29,000,000 km)
Mars MOID 0.168 au (25,100,000 km)
Jupiter MOID 3.877 au (580.0 Gm)
TJupiter 5.525
Proper orbital elements
0.21145
5.0415°
Proper mean motion
301.1345 deg / yr
1.19548 yr
(436.649 d)
Physical characteristics
Dimensions 282.37 × 268.05 × 249.25 ± 0.06 m
Mean radius
245.03±0.08 m
Equatorial radius
282.37±0.06 m
Polar radius
249.25±0.06 m
0.782±0.004 km2
Volume 0.0615±0.0001 km3
Mass (7.329±0.009)×1010 kg
Mean density
1.190±0.013 g/cm3
Equatorial surface gravity
6 micro-g
4.296057±0.000002 h
177.6±0.11°
North pole right ascension
+85.65±0.12°
North pole declination
−60.17±0.09°
0.044±0.002
Surface temp. min mean max
Kelvin 236 259 279
Fahrenheit -34.6 6.8 42.8
Celsius -37 -14 6
B
F
20.9


101955 Bennu (provisional designation 1999 RQ36) is a carbonaceous asteroid in the Apollo group discovered by the LINEAR Project on 11 September 1999.

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).

Bennu is the target of the OSIRIS-REx mission which is intended to return samples to Earth in 2023 for further study.

Bennu is the second-highest on the cumulative rating on the Palermo technical impact hazard scale.

It is believed that Bennu broke off from another asteroid in the asteroid belt, but the gravitational pull of Saturn dislodged it into the range of Earth.

Bennu orbits the Sun every 1.2 years. It comes within 0.002 astronomical units of the earth every 6 years.

Some believe that if Bennu enters a specific hole between the earth and the moon its orbit could change in a way that would make it likely to hit Earth.

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