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100878 (1998 HJ90)
Classification: Main-belt Asteroid          SPK-ID: 2100878
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1646315463904297 4.3173e-08  
a 2.351115353500868 1.1574e-08 au
q 1.964047597111739 1.0122e-07 au
i 2.886960443086899 4.0898e-06 deg
node 134.1991188665749 9.0486e-05 deg
peri 98.12915866476172 9.1341e-05 deg
M 88.14575836159193 1.2874e-05 deg
tp 2458878.090187498762
(2020-Jan-29.59018750)		 4.6344e-05 TDB
period 1316.768210494177
3.61		 9.7231e-06
2.662e-08		 d
yr
n .2733966366524702 2.0188e-09 deg/d
Q 2.738183109889998 1.3479e-08 au
   Orbit Determination Parameters
   # obs. used (total)      319  
   data-arc span      9119 days (24.97 yr)  
   first obs. used      1995-07-27  
   last obs. used      2020-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6207  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:34:10  

Additional Information
 Earth MOID = .954411 au 
 Jupiter MOID = 2.25518 au 
 T_jup = 3.538 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457274.5 (2015-Sep-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1644196144189035 4.3206e-08  
q 1.964873995811275 1.0122e-07 au
tp 2457560.542926671450
(2016-Jun-21.04292667)		 4.4523e-05 TDB
node 134.2227771160233 9.052e-05 deg
peri 98.00474861224343 9.1375e-05 deg
i 2.88589287983383 4.0887e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      319  
   data-arc span      9119 days (24.97 yr)  
   first obs. used      1995-07-27  
   last obs. used      2020-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6207  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:34:10  

Additional Information
 Jupiter MOID = 2.25518 au 
 T_jup = 3.538 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.866765641620734E-15 -4.353693188889368E-15 -3.214689397509266E-13 2.007348484738599E-14 -5.132615013042747E-14 -2.18619155052439E-15
q -4.353693188889368E-15 1.024498101220502E-14 7.959056634166845E-13 -4.691492390654038E-14 1.270520077022064E-13 5.192013351768235E-15
tp -3.214689397509266E-13 7.959056634166845E-13 1.982295153301853E-9 -4.674893871388149E-12 5.741554379915767E-10 1.261269499378345E-12
node 2.007348484738599E-14 -4.691492390654038E-14 -4.674893871388149E-12 8.193822331155353E-9 -8.183967760538909E-9 6.448154679455342E-11
peri -5.132615013042747E-14 1.270520077022064E-13 5.741554379915767E-10 -8.183967760538909E-9 8.349462894770903E-9 -6.408615490573038E-11
i -2.18619155052439E-15 5.192013351768235E-15 1.261269499378345E-12 6.448154679455342E-11 -6.408615490573038E-11 1.671787218919674E-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 17.30   n/a E2021B55  

100878 (1998 HJ90)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1998 HJ90 = 1995 OQ9 = 2002 OY18 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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