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C/2020 H4 (Leonard)
Classification: Comet          SPK-ID: 1003679
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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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 2458969.5 (2020-Apr-30.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9933206354049715 0.0010045  
a 140.4765584402877 21.228 au
q .9382941508775086 0.00068472 au
i 84.32043228476353 0.007211 deg
node 307.7679276442407 0.0044727 deg
peri 116.7725261922923 0.057684 deg
M 359.9282248608215 0.016287 deg
tp 2459090.748327781146
(2020-Aug-29.24832778)
0.030843 TDB
period 608140.9036721394
1665.00
1.3785e+05
377.4
d
yr
n .0005919680748757578 0.00013418 deg/d
Q 280.0148227296979 42.314 au
  Orbit Determination Parameters
   # obs. used (total)      37  
   data-arc span      42 days  
   first obs. used      2020-04-21  
   last obs. used      2020-06-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .80262  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-26 07:52:58  

Additional Information
 Earth MOID = .25657 au 
 Jupiter MOID = .926258 au 
 T_jup = 0.156 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 16.5   0.7 5 2 parameter fit from 31 observations, autocmod 2.8
comet total magnitude slope K1 4.5   n/a 5 autocmod 2.8

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2020.7   C/2020 H4       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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