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31982 Johnwallis (2000 HS20)
Classification: Outer Main-belt Asteroid          SPK-ID: 2031982
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1511843305147147 4.2396e-08  
a 3.200972472884061 2.7682e-08 au
q 2.717035592575054 1.331e-07 au
i 2.252066118318674 5.3236e-06 deg
node 238.7551416606691 0.00013552 deg
peri 24.91509831724014 0.00013685 deg
M 166.4695509440111 1.9853e-05 deg
tp 2458033.216803783058
(2017-Oct-06.71680378)
0.00011237 TDB
period 2091.805670547024
5.73
2.7135e-05
7.429e-08
d
yr
n .1721001166928939 2.2325e-09 deg/d
Q 3.684909353193069 3.1867e-08 au
  Orbit Determination Parameters
   # obs. used (total)      538  
   data-arc span      8460 days (23.16 yr)  
   first obs. used      1996-10-05  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57127  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 02:21:11  

Additional Information
 Earth MOID = 1.70158 au 
 Jupiter MOID = 1.39363 au 
 T_jup = 3.175 
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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 15.0   n/a MPO452620  
diameter diameter 4.814 km 1.817 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.110   0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

31982 Johnwallis           Discovered 2000 Apr. 30 by P. G. Comba at Prescott.
John Wallis (1616-1703) was an professor of geometry at Oxford. His fame rests on a formula that represents \pi as an infinite product and on the invention of the symbol {i}nfty for infinity.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020328/MPCPages.arcLast Updated: 2003-10-02

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