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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1153339411334359 4.3745e-08  
a 2.297856235866412 8.8849e-09 au
q 2.032835420025897 9.9536e-08 au
i 2.012257182790452 4.554e-06 deg
node 199.1806233732389 0.00010996 deg
peri 24.04163631284066 0.00011113 deg
M 172.0372274688955 1.5686e-05 deg
tp 2458592.501312562966
(2019-Apr-19.00131256)
5.4754e-05 TDB
period 1272.280021583734
3.48
7.3791e-06
2.02e-08
d
yr
n .2829565770842428 1.6411e-09 deg/d
Q 2.562877051706927 9.9096e-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 = 1.02303 au 
 Jupiter MOID = 2.40983 au 
 T_jup = 3.584 
[ show covariance matrix ]

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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