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C/2020 H7 (Lemmon)
Classification: Comet          SPK-ID: 1003685
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | 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 2458990.5 (2020-May-21.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9994272383275041 0.00014548  
a 7717.183841757887 1960.3 au
q 4.420107124163347 5.1965e-05 au
i 135.9229008286889 7.7857e-05 deg
node 323.5291285693203 0.00069088 deg
peri 82.76916073980068 0.0032392 deg
M 359.99998036365 7.5016e-06 deg
tp 2459004.006566491763
(2020-Jun-03.50656649)		 0.02229 TDB
period 247620557.0911056
677948.14		 9.4349e+07
2.583e+05		 d
yr
n 1.453837291334206E-6 5.5394e-07 deg/d
Q 15429.94757639161 3919.4 au
   Orbit Determination Parameters
   # obs. used (total)      174  
   data-arc span      137 days  
   first obs. used      2020-04-29  
   last obs. used      2020-09-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .41502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-24 20:18:33  

Additional Information
 Earth MOID = 3.74861 au 
 Jupiter MOID = 1.69334 au 
 T_jup = -1.872 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.2   0.6 9 from 128 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 10.   n/a 9 autocmod 2.8

Alternate Designations
 Perihelion 
Year (est.)		  New-Style 
Desig		 Roman
 Numeral 		 Year/
 Letter 
 2020.4   C/2020 H7       
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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