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120955 (1998 UO31)
Classification: Main-belt Asteroid          SPK-ID: 2120955
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2302912258448158 3.9538e-08  
a 2.224991554123168 9.898e-09 au
q 1.712595521629782 9.1328e-08 au
i 3.490907872058822 4.924e-06 deg
node 64.61856303953482 7.7575e-05 deg
peri 237.6950613707097 7.8985e-05 deg
M 326.7568623162007 1.9898e-05 deg
tp 2459312.441335681200
(2021-Apr-07.94133568)
6.7492e-05 TDB
period 1212.246606458908
3.32
8.0891e-06
2.215e-08
d
yr
n .2969692784305625 1.9816e-09 deg/d
Q 2.737387586616554 1.2177e-08 au
  Orbit Determination Parameters
   # obs. used (total)      766  
   data-arc span      7882 days (21.58 yr)  
   first obs. used      1998-10-22  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52269  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:55  

Additional Information
 Earth MOID = .698411 au 
 Jupiter MOID = 2.50285 au 
 T_jup = 3.609 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.89   n/a E2021B55  

120955 (1998 UO31)          Discovered 1998-Oct-22 by BAO Schmidt CCD Asteroid Program at Xinglong
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 UO31 = 2001 OX57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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