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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04381036982329486 4.006e-08  
a 3.088534217974152 2.6867e-08 au
q 2.953224391672803 1.2117e-07 au
i 7.433958468766329 3.9621e-06 deg
node 249.5747667045864 4.2928e-05 deg
peri 35.17826462222887 9.8569e-05 deg
M 70.89278437799697 8.3944e-05 deg
tp 2458810.084918375519
(2019-Nov-22.58491838)
0.00046491 TDB
period 1982.563255456439
5.43
2.5869e-05
7.083e-08
d
yr
n .1815831091437829 2.3694e-09 deg/d
Q 3.2238440442755 2.8044e-08 au
  Orbit Determination Parameters
   # obs. used (total)      778  
   data-arc span      7727 days (21.16 yr)  
   first obs. used      1999-10-12  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52714  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:48:03  

Additional Information
 Earth MOID = 1.93863 au 
 Jupiter MOID = 1.85074 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 14.44   n/a E2021B10  

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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