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21988 (1999 XQ20)
Classification: Main-belt Asteroid          SPK-ID: 2021988
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06305608421942258 4.8068e-08  
a 2.969350989185898 1.7513e-08 au
q 2.782115343134766 1.4508e-07 au
i 10.88518238218821 5.1587e-06 deg
node 54.55650257121965 2.733e-05 deg
peri 355.0389638987699 5.1129e-05 deg
M 74.54302392553041 4.2092e-05 deg
tp 2459009.514015425164
(2020-Jun-09.01401542)
0.00021847 TDB
period 1868.92008279834
5.12
1.6534e-05
4.527e-08
d
yr
n .1926246088923025 1.7041e-09 deg/d
Q 3.156586635237029 1.8617e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      12815 days (35.09 yr)  
   first obs. used      1986-03-04  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52973  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:36  

Additional Information
 Earth MOID = 1.79231 au 
 Jupiter MOID = 2.17172 au 
 T_jup = 3.233 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457118.5 (2015-Apr-06.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06085798107532513 4.9084e-08  
q 2.787810255151489 1.477e-07 au
tp 2457123.549569085156
(2015-Apr-11.04956909)
0.00022484 TDB
node 54.64775785832699 2.7391e-05 deg
peri 351.7851401718167 5.2031e-05 deg
i 10.87492473223079 5.1572e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      12815 days (35.09 yr)  
   first obs. used      1986-03-04  
   last obs. used      2021-04-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52973  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:36  

Additional Information
 Jupiter MOID = 2.17172 au 
 T_jup = 3.233 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.409242599769477E-15 -7.205022281320626E-15 -5.199196148310452E-12 1.351769505791581E-14 -1.074724093291209E-12 -1.530794546381151E-15
q -7.205022281320626E-15 2.181413882499957E-14 1.524388721239468E-11 -4.280883921862254E-14 3.155088846158236E-12 6.054128935751232E-15
tp -5.199196148310452E-12 1.524388721239468E-11 5.055270143419744E-8 1.056483836733927E-11 9.982141710980449E-9 -4.208887595905095E-12
node 1.351769505791581E-14 -4.280883921862254E-14 1.056483836733927E-11 7.502771074241765E-10 -7.351056040151974E-10 -6.07986718989375E-11
peri -1.074724093291209E-12 3.155088846158236E-12 9.982141710980449E-9 -7.351056040151974E-10 2.707208956600042E-9 5.895284662348745E-11
i -1.530794546381151E-15 6.054128935751232E-15 -4.208887595905095E-12 -6.07986718989375E-11 5.895284662348745E-11 2.659645860239115E-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 14.2   n/a MPO400221  

21988 (1999 XQ20)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XQ20 = 1997 JC12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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