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21972 (1999 XU)
Classification: Main-belt Asteroid          SPK-ID: 2021972
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .251526184193875 4.0626e-08  
a 2.612674994550763 1.0267e-08 au
q 1.955518822632657 1.0899e-07 au
i 6.646493552836442 3.2831e-06 deg
node 71.7085935305489 3.7597e-05 deg
peri 273.1367501773387 3.8387e-05 deg
M 16.91794504464218 6.1026e-06 deg
tp 2459128.011081707334
(2020-Oct-05.51108171)
2.6195e-05 TDB
period 1542.504749631173
4.22
9.0927e-06
2.489e-08
d
yr
n .233386639545894 1.3758e-09 deg/d
Q 3.269831166468869 1.285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1476  
   data-arc span      9244 days (25.31 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:39  

Additional Information
 Earth MOID = .960248 au 
 Jupiter MOID = 2.18785 au 
 T_jup = 3.354 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457654.5 (2016-Sep-23.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2522534717660306 4.061e-08  
q 1.953712885075136 1.0908e-07 au
tp 2457587.075307618579
(2016-Jul-17.57530762)
2.8795e-05 TDB
node 71.71951341264511 3.7578e-05 deg
peri 273.4620646582851 3.8362e-05 deg
i 6.648946235571588 3.2851e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1476  
   data-arc span      9244 days (25.31 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:39  

Additional Information
 Jupiter MOID = 2.18785 au 
 T_jup = 3.354 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.649204885913709E-15 -4.420059379411306E-15 3.719844913887009E-13 2.023805674497092E-14 9.451493269462551E-14 -6.705684647064859E-15
q -4.420059379411306E-15 1.189907984757132E-14 -1.071464780964949E-12 -5.488188073927455E-14 -2.711638976679963E-13 1.826579809075627E-14
tp 3.719844913887009E-13 -1.071464780964949E-12 8.29165003249808E-10 1.675806737408493E-12 2.426603212708504E-10 -1.405273364399212E-12
node 2.023805674497092E-14 -5.488188073927455E-14 1.675806737408493E-12 1.412112142355809E-9 -1.402157255011199E-9 -2.816771496610752E-11
peri 9.451493269462551E-14 -2.711638976679963E-13 2.426603212708504E-10 -1.402157255011199E-9 1.47164150985101E-9 2.756600334501255E-11
i -6.705684647064859E-15 1.826579809075627E-14 -1.405273364399212E-12 -2.816771496610752E-11 2.756600334501255E-11 1.079169922381725E-11

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 14.61   n/a E2021B10  

21972 (1999 XU)          Discovered 1999-Dec-02 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XU = 1995 UJ49 = 1996 CB9 = 1998 HT71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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