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181857 (1998 XH6)
Classification: Main-belt Asteroid          SPK-ID: 2181857
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1058056427641634 4.9601e-08  
a 2.558674693368075 1.4625e-08 au
q 2.287952472811867 1.2891e-07 au
i 1.768505186676614 5.9191e-06 deg
node 153.5591340221181 0.0001252 deg
peri 238.9383478087923 0.00012875 deg
M 162.3263645718744 2.9162e-05 deg
tp 2458526.425964272381
(2019-Feb-11.92596427)
0.0001186 TDB
period 1494.930620185826
4.09
1.2817e-05
3.509e-08
d
yr
n .2408138512510035 2.0646e-09 deg/d
Q 2.829396913924282 1.6172e-08 au
  Orbit Determination Parameters
   # obs. used (total)      351  
   data-arc span      7775 days (21.29 yr)  
   first obs. used      1998-12-08  
   last obs. used      2020-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59854  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:20  

Additional Information
 Earth MOID = 1.29315 au 
 Jupiter MOID = 2.56695 au 
 T_jup = 3.428 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456971.5 (2014-Nov-10.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1041352578303714 4.9804e-08  
q 2.292778850880962 1.2942e-07 au
tp 2457027.140238630019
(2015-Jan-04.64023863)
0.0001163 TDB
node 153.5615764605616 0.00012523 deg
peri 238.2322101713135 0.00012889 deg
i 1.766989503796012 5.9217e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      351  
   data-arc span      7775 days (21.29 yr)  
   first obs. used      1998-12-08  
   last obs. used      2020-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59854  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:20  

Additional Information
 Jupiter MOID = 2.56695 au 
 T_jup = 3.428 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.480457338588472E-15 -6.412604357065732E-15 -3.336613681433039E-12 2.673346060418045E-14 -9.102045159509544E-13 -6.303421929496175E-16
q -6.412604357065732E-15 1.674863114775634E-14 9.034614542589142E-12 -7.131121346047313E-14 2.454118589215746E-12 1.652594817196701E-15
tp -3.336613681433039E-12 9.034614542589142E-12 1.352602608363409E-8 -6.370894816097761E-11 3.559946769735722E-9 1.375472531719439E-12
node 2.673346060418045E-14 -7.131121346047313E-14 -6.370894816097761E-11 1.568133742106477E-8 -1.569003748842356E-8 1.610890784283184E-10
peri -9.102045159509544E-13 2.454118589215746E-12 3.559946769735722E-9 -1.569003748842356E-8 1.661326033627525E-8 -1.606557599054204E-10
i -6.303421929496175E-16 1.652594817196701E-15 1.375472531719439E-12 1.610890784283184E-10 -1.606557599054204E-10 3.506677526284034E-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 17.12   n/a E2021B55  

181857 (1998 XH6)          Discovered 1998-Dec-08 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

Alternate Designations
 1998 XH6 = 2004 FK163 = 2006 SJ201 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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