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91844 (1999 UR2)
Classification: Main-belt Asteroid          SPK-ID: 2091844
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04421471647462215 4.0045e-08  
a 3.090312659863542 2.7045e-08 au
q 2.95367536178974 1.2156e-07 au
i 7.433970577864648 3.9747e-06 deg
node 249.5908043586076 4.2933e-05 deg
peri 35.67310757700338 9.7865e-05 deg
M 34.0694752377518 8.3392e-05 deg
tp 2458812.713225684151
(2019-Nov-25.21322568)
0.00046091 TDB
period 1984.275903339879
5.43
2.6048e-05
7.132e-08
d
yr
n .1814263829914267 2.3816e-09 deg/d
Q 3.226949957937343 2.8241e-08 au
  Orbit Determination Parameters
   # obs. used (total)      770  
   data-arc span      7690 days (21.05 yr)  
   first obs. used      1999-10-12  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52817  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:38:18  

Additional Information
 Earth MOID = 1.94106 au 
 Jupiter MOID = 1.85018 au 
 T_jup = 3.211 
[ 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 14.3   n/a MPO436414  

91844 (1999 UR2)          Discovered 1999-Oct-19 by Kusnirak, P., Pravec, P. at Ondrejov
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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