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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457019.5 (2014-Dec-28.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2308312378728254 3.955e-08  
q 1.711410596821095 9.1398e-08 au
tp 2456887.312564085884
(2014-Aug-17.81256409)
5.7678e-05 TDB
node 64.66070945848337 7.7597e-05 deg
peri 237.6103676239663 7.8994e-05 deg
i 3.490808576579314 4.9227e-06 deg
  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
 Jupiter MOID = 2.50285 au 
 T_jup = 3.609 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.564207226394702E-15 -3.604078337482325E-15 -2.997333705935702E-13 -4.223192080513104E-15 -6.155282071333242E-14 -2.144786722327934E-16
q -3.604078337482325E-15 8.353588425633494E-15 8.845994275120729E-13 1.045411138330777E-14 1.903697983240416E-13 8.458816003489438E-16
tp -2.997333705935702E-13 8.845994275120729E-13 3.326697703252909E-9 1.159879801433439E-11 8.743775759954338E-10 2.168777148580806E-12
node -4.223192080513104E-15 1.045411138330777E-14 1.159879801433439E-11 6.021305912959882E-9 -6.006766847781285E-9 -9.20627150007022E-11
peri -6.155282071333242E-14 1.903697983240416E-13 8.743775759954338E-10 -6.006766847781285E-9 6.240068722999071E-9 9.245577270506836E-11
i -2.144786722327934E-16 8.458816003489438E-16 2.168777148580806E-12 -9.20627150007022E-11 9.245577270506836E-11 2.423296335947514E-11

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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