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120979 (1998 XU)
Classification: Main-belt Asteroid          SPK-ID: 2120979
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2401514622122206 6.3505e-08  
a 2.330186463410322 8.7911e-09 au
q 1.77058877699521 1.5267e-07 au
i 1.417456885891889 4.4149e-06 deg
node 208.5305907086292 0.00019724 deg
peri 163.9058822984763 0.00019753 deg
M 44.89254688253672 1.2206e-05 deg
tp 2458838.484642481149
(2019-Dec-20.98464248)
4.3428e-05 TDB
period 1299.225211244923
3.56
7.3524e-06
2.013e-08
d
yr
n .2770882191048667 1.5681e-09 deg/d
Q 2.889784149825434 1.0902e-08 au
  Orbit Determination Parameters
   # obs. used (total)      410  
   data-arc span      8690 days (23.79 yr)  
   first obs. used      1996-02-10  
   last obs. used      2019-11-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52993  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 10:03:13  

Additional Information
 Earth MOID = .770973 au 
 Jupiter MOID = 2.57593 au 
 T_jup = 3.532 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457194.5 (2015-Jun-21.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2417820914055751 6.3704e-08  
q 1.766100457331262 1.5337e-07 au
tp 2457538.674200187461
(2016-May-30.17420019)
3.8049e-05 TDB
node 208.5612986075541 0.00019726 deg
peri 163.7521982932724 0.00019754 deg
i 1.416610312663534 4.4227e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      410  
   data-arc span      8690 days (23.79 yr)  
   first obs. used      1996-02-10  
   last obs. used      2019-11-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52993  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 10:03:13  

Additional Information
 Jupiter MOID = 2.57593 au 
 T_jup = 3.532 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.058182398644789E-15 -9.765555688331929E-15 -1.443218917091858E-12 -2.23568219621872E-14 -2.311752499900811E-13 -3.953057788735009E-15
q -9.765555688331929E-15 2.352299406465255E-14 3.513406841931782E-12 5.484189848512078E-14 5.648533939758286E-13 9.596713292327854E-15
tp -1.443218917091858E-12 3.513406841931782E-12 1.447708974215854E-9 5.879349158341677E-12 4.029214795235177E-10 2.308162919924845E-12
node -2.23568219621872E-14 5.484189848512078E-14 5.879349158341677E-12 3.8912673030347E-8 -3.89000653233731E-8 -3.65453027693358E-10
peri -2.311752499900811E-13 5.648533939758286E-13 4.029214795235177E-10 -3.89000653233731E-8 3.902246317385912E-8 3.658962452028584E-10
i -3.953057788735009E-15 9.596713292327854E-15 2.308162919924845E-12 -3.65453027693358E-10 3.658962452028584E-10 1.955988273593502E-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 17.0   n/a MPO439780  

120979 (1998 XU)          Discovered 1998-Dec-07 by ODAS at Caussols
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 XU = 1996 CE6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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