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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.


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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 
[ 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 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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