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101955 Bennu (1999 RQ36)
Classification: Apollo [NEO, PHA]          SPK-ID: 2101955
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2455562.5 (2011-Jan-01.0) TDB
Reference: JPL 90 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037451282361611 2.0776e-08  
a 1.126391025982997 4.1089e-11 AU
q .8968943419500303 2.3388e-08 AU
i 6.034936934608099 2.6954e-06 deg
node 2.060867741321586 4.4675e-06 deg
peri 66.22307352820037 5.2194e-06 deg
M 101.7039453624947 2.2806e-06 deg
tp 2455439.141948911881
(2010-Aug-30.64194891)
2.7635e-06 JED
period 436.6487281632979
1.20
2.3893e-08
6.542e-11
d
yr
n .8244613502352105 4.5113e-11 deg/d
Q 1.355887710015964 4.9461e-11 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -4.672858861483131E-14 2.455E-16
ALN [SET] 1. n/a
AMRAT [SET] 3.07E-6 n/a
NK [SET] 0. n/a
NM [SET] 2.75 n/a
NN [SET] 0. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      578  
   # delay obs. used      19  
   # Doppler obs. used      6  
   data-arc span      4880 days (13.36 yr)  
   first obs. used      1999-09-11  
   last obs. used      2013-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .41702  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-10 20:27:54  

Additional Information
 Earth MOID = .0032228 AU 
 T_jup = 5.525 
 Nongravitational accels. using nonstandard g(r) = (1 AU/ r)^2.75 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.9 mag n/a MPO251037  
rotation period rot_per 4.288 h n/a Nolan, M.C., et al., "The Shape and Spin of 101955 (1999 RQ36) from Arecibo and (2.1 hour harmonic is ruled out by the radar data)

101955 Bennu           Discovered 1999 Sept. 11 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Bennu was an Egyptian mythological figure associated with Osiris, Atum and Ra. This minor planet is the target of the OSIRIS-REx sample return mission. OSIRIS-REx's Touch-and-Go Sampler evokes Bennu's image as a heron. Name suggested by Michael Toler Puzio (b. 2004) via a naming contest for students.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2013-04-25Last Updated: 2013-04-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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