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31321 (1998 HD3)
Classification: Main-belt Asteroid          SPK-ID: 2031321
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08400030830770809 4.4985e-08  
a 3.19829507044988 1.9728e-08 au
q 2.929637298473067 1.4766e-07 au
i 5.890811266112606 4.1702e-06 deg
node 38.25841243925066 4.2756e-05 deg
peri 132.4837752179385 4.9459e-05 deg
M 353.1839549601656 2.3373e-05 deg
tp 2459040.055435526135
(2020-Jul-09.55543553)
0.00013564 TDB
period 2089.181733129281
5.72
1.933e-05
5.292e-08
d
yr
n .1723162682744569 1.5943e-09 deg/d
Q 3.466952842426693 2.1385e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1253  
   data-arc span      21758 days (59.57 yr)  
   first obs. used      1960-10-17  
   last obs. used      2020-05-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54094  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:01:42  

Additional Information
 Earth MOID = 1.93894 au 
 Jupiter MOID = 1.50585 au 
 T_jup = 3.181 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456912.5 (2014-Sep-12.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08564805290195374 4.4849e-08  
q 2.924234227712127 1.4748e-07 au
tp 2456947.685700709491
(2014-Oct-17.18570071)
0.00013414 TDB
node 38.29029565036161 4.2755e-05 deg
peri 131.9437604503258 4.9242e-05 deg
i 5.891639024847473 4.1703e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1253  
   data-arc span      21758 days (59.57 yr)  
   first obs. used      1960-10-17  
   last obs. used      2020-05-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54094  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:01:42  

Additional Information
 Jupiter MOID = 1.50585 au 
 T_jup = 3.181 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.011425167086397E-15 -6.56647208724749E-15 4.698494826160188E-13 -4.967715980643782E-15 1.49277084051125E-13 -1.469831473652155E-15
q -6.56647208724749E-15 2.174924307169293E-14 -1.780256324830258E-12 1.897078755363777E-14 -5.374913246446461E-13 4.925405190702171E-15
tp 4.698494826160188E-13 -1.780256324830258E-12 1.799276434459421E-8 -3.969450482814374E-11 3.301417678232648E-9 4.339539563308098E-12
node -4.967715980643782E-15 1.897078755363777E-14 -3.969450482814374E-11 1.827976279655432E-9 -1.825226610206579E-9 -3.282230131521487E-11
peri 1.49277084051125E-13 -5.374913246446461E-13 3.301417678232648E-9 -1.825226610206579E-9 2.424764620783258E-9 3.341639301617262E-11
i -1.469831473652155E-15 4.925405190702171E-15 4.339539563308098E-12 -3.282230131521487E-11 3.341639301617262E-11 1.73913619469002E-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 14.0   n/a MPO296380  

31321 (1998 HD3)          Discovered 1998-Apr-21 by Klet at Klet
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 HD3 = 1981 JY4 = 2000 SN32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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