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

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Orbital Elements at Epoch 2455562.5 (2011-Jan-01.0) TDB
Reference: JPL 118 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037450762416414 6.9748e-11  
a 1.126391025894812 1.9673e-10 au
q .8968944004459729 2.3047e-10 au
i 6.03494377024794 6.8601e-09 deg
node 2.06086619569642 5.5577e-08 deg
peri 66.22306084084298 6.4419e-08 deg
M 101.703952002457 4.2749e-08 deg
tp 2455439.141940872670
(2010-Aug-30.64194087)
2.2536e-08 TDB
period 436.6487281120201
1.20
1.144e-07
3.132e-10
d
yr
n .8244613503320309 2.16e-10 deg/d
Q 1.355887651343651 2.3681e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
AMRAT [EST] 2.635943157E-6 1.908E-7
RHO [EST] 1191.534909615045 .892
  Orbit Determination Parameters
   # obs. used (total)      554  
   # delay obs. used      58  
   # Doppler obs. used      7  
   data-arc span      7693 days (21.06 yr)  
   first obs. used      1999-09-11  
   last obs. used      2020-10-03  
   planetary ephem.      DE424  
   SB-pert. ephem.      SB424-N343  
   condition code      0  
   norm. resid. RMS      .29146  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2021-Jan-07 11:18:06  

Additional Information
 Earth MOID = .0032228 au 
 Jupiter MOID = 3.87795 au 
 T_jup = 5.525 
 See Farnocchia et al. 2021 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.21   0.03 Hergenrother, M.C., et al., Nat. Commun. 10, 1291 (2019)  
magnitude slope G -0.031   0.009 Hergenrother, M.C., et al., Nat. Commun. 10, 1291 (2019)  
diameter diameter 0.482 km 0.3 Daly, M.G., et al., Sci. Adv. 6, eabd3649 (2020)  
extent extent 0.5047 x 0.4918 x 0.4567 km 0.002 x 0.002 x 0.002 Daly, M.G., et al., Sci. Adv. 6, eabd3649 (2020)  
GM GM 4.8904e-9 km^3/s^2 0.0009e-9 Chesley, S.R., et al., J. Geophys. Res. (Planets) 125, e06363 (2020)  
bulk density density 1.194 g/cm^3 0.003 Daly, M.G., et al., Sci. Adv. 6, eabd3649 (2020)  
rotation period rot_per 4.296061 h 0.000002 Hergenrother, M.C., et al., Nat. Commun. 10, 1291 (2019) J2000 epoch
rotational acceleration rot_acc 6.34e-8 rad/d^2 0.91e-8 Hergenrother, M.C., et al., Nat. Commun. 10, 1291 (2019)  
pole direction pole 85.4522/-60.3678   0.0003/0.0001 Daly, M.G., et al., Sci. Adv. 6, eabd3649 (2020)  
geometric albedo albedo 0.044   0.002 Hergenrother, M.C., et al., Nat. Commun. 10, 1291 (2019)  
thermal inertia I 300 J/m^2/s^0.5/K 30 Rozitis, B., et al., Sci. Adv. 6, eabc3699 (2020)  
B-V BV 0.64   0.04 Hergenrother, C.W. et al. Icarus 226, 663-670 (2013)  
U-B UB 0.16   0.05 Hergenrother, C.W. et al. Icarus 226, 663-670 (2013)  
I-R IR -0.33   0.06 Hergenrother, C.W. et al. Icarus 226, 663-670 (2013)  
SMASSII spectral type spec_B B   n/a Clark, B.E., et al., Icarus 216, 462-475 (2011)  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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