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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 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 2.116539425845584E-8 7.405483343012664E-9 -1.968088829824815E-6 7.012990240931967E-8 -2.386642379278374E-7 -7.861997307843623E-9
q 7.405483343012664E-9 2.700395693863937E-9 -5.918532148274713E-7 2.642817995267306E-8 -6.781733101727495E-8 -2.848407363388834E-9
tp -1.968088829824815E-6 -5.918532148274713E-7 .0004968330818591648 -3.178446279555799E-6 7.133146819136896E-5 6.837824133983971E-7
node 7.012990240931967E-8 2.642817995267306E-8 -3.178446279555799E-6 4.773150794198786E-7 -1.179266346447264E-7 -4.294104682642763E-9
peri -2.386642379278374E-7 -6.781733101727495E-8 7.133146819136896E-5 -1.179266346447264E-7 1.049252061161826E-5 9.73208760189746E-8
i -7.861997307843623E-9 -2.848407363388834E-9 6.837824133983971E-7 -4.294104682642763E-9 9.73208760189746E-8 6.061726970830437E-9

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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