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100871 (1998 HH81)
Classification: Main-belt Asteroid          SPK-ID: 2100871
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1153957812480237 4.3764e-08  
a 2.297885719024411 8.9274e-09 au
q 2.032719401258912 9.9627e-08 au
i 2.012266250639265 4.554e-06 deg
node 199.1806256403116 0.00010996 deg
peri 24.09216624972359 0.00011112 deg
M 115.3810821706401 1.5598e-05 deg
tp 2458592.722580577959
(2019-Apr-19.22258058)
5.4705e-05 TDB
period 1272.304508072031
3.48
7.4144e-06
2.03e-08
d
yr
n .2829511313651801 1.6489e-09 deg/d
Q 2.563052036789909 9.9575e-09 au
  Orbit Determination Parameters
   # obs. used (total)      434  
   data-arc span      8222 days (22.51 yr)  
   first obs. used      1998-04-21  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58628  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:03:48  

Additional Information
 Earth MOID = 1.02408 au 
 Jupiter MOID = 2.41087 au 
 T_jup = 3.584 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457290.5 (2015-Sep-25.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1147319211505814 4.3852e-08  
q 2.034489715583181 9.9759e-08 au
tp 2457319.780570355116
(2015-Oct-24.28057036)
5.4335e-05 TDB
node 199.2199960533333 0.00010994 deg
peri 24.07097087570327 0.00011112 deg
i 2.0120332271565 4.555e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      434  
   data-arc span      8222 days (22.51 yr)  
   first obs. used      1998-04-21  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58628  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:03:48  

Additional Information
 Jupiter MOID = 2.41087 au 
 T_jup = 3.584 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.92301732812885E-15 -4.361301934651633E-15 1.024293753675429E-13 3.497860656607544E-14 3.608223435968384E-16 -7.202460305664594E-16
q -4.361301934651633E-15 9.951863811168494E-15 -2.256636074850093E-13 -7.879155814690578E-14 3.929970456470919E-16 1.70920165451719E-15
tp 1.024293753675429E-13 -2.256636074850093E-13 2.952242680788273E-9 8.662027962266866E-12 8.899984320164754E-10 5.817199233823548E-13
node 3.497860656607544E-14 -7.879155814690578E-14 8.662027962266866E-12 1.208685218622315E-8 -1.207608272534146E-8 1.3169232798154E-10
peri 3.608223435968384E-16 3.929970456470919E-16 8.899984320164754E-10 -1.207608272534146E-8 1.23472352607823E-8 -1.31446551362233E-10
i -7.202460305664594E-16 1.70920165451719E-15 5.817199233823548E-13 1.3169232798154E-10 -1.31446551362233E-10 2.074785791990507E-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 17.1   n/a MPO432536  

100871 (1998 HH81)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1998 HH81 = 2002 PH18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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