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100864 (1998 HW54)
Classification: Main-belt Asteroid          SPK-ID: 2100864
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2332213922559754 5.2031e-08  
a 3.037353188791625 1.9044e-08 au
q 2.328977449328515 1.525e-07 au
i 2.648114268887915 4.5499e-06 deg
node 298.807528538314 0.00013883 deg
peri 225.8291847230971 0.00013939 deg
M 99.15324516143343 1.1583e-05 deg
tp 2458467.967887076867
(2018-Dec-15.46788708)
6.0939e-05 TDB
period 1933.487505529428
5.29
1.8185e-05
4.979e-08
d
yr
n .1861920488084172 1.7511e-09 deg/d
Q 3.745728928254734 2.3486e-08 au
  Orbit Determination Parameters
   # obs. used (total)      366  
   data-arc span      7767 days (21.26 yr)  
   first obs. used      1998-03-29  
   last obs. used      2019-07-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56975  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 01:12:31  

Additional Information
 Earth MOID = 1.33763 au 
 Jupiter MOID = 1.25554 au 
 T_jup = 3.197 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457132.5 (2015-Apr-20.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2324784054046352 5.1814e-08  
q 2.327697475896358 1.5136e-07 au
tp 2456535.741726847454
(2013-Aug-31.24172685)
5.8951e-05 TDB
node 298.9010786000852 0.0001391 deg
peri 225.1522313699684 0.00013966 deg
i 2.646496019733841 4.5463e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      366  
   data-arc span      7767 days (21.26 yr)  
   first obs. used      1998-03-29  
   last obs. used      2019-07-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56975  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 01:12:31  

Additional Information
 Jupiter MOID = 1.25554 au 
 T_jup = 3.197 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.684736790565027E-15 -7.813277460324757E-15 6.587981512184941E-13 1.965748050807321E-15 1.047118781765366E-13 -2.699670185446668E-15
q -7.813277460324757E-15 2.290875856999186E-14 -2.000192701978826E-12 1.32335258208906E-14 -3.263410538844076E-13 6.986826660451127E-15
tp 6.587981512184941E-13 -2.000192701978826E-12 3.475168851625621E-9 -3.440954004494519E-11 8.113069489425874E-10 -9.441816505910232E-13
node 1.965748050807321E-15 1.32335258208906E-14 -3.440954004494519E-11 1.934867928873568E-8 -1.933233306787367E-8 1.910579829942899E-11
peri 1.047118781765366E-13 -3.263410538844076E-13 8.113069489425874E-10 -1.933233306787367E-8 1.950566595737591E-8 -1.946675276613502E-11
i -2.699670185446668E-15 6.986826660451127E-15 -9.441816505910232E-13 1.910579829942899E-11 -1.946675276613502E-11 2.066904439596026E-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 15.7   n/a MPO432536  

100864 (1998 HW54)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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