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C/2020 R4 (ATLAS)
Classification: Comet          SPK-ID: 1003720
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | 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.


Orbital Elements at Epoch 2459279.5 (2021-Mar-06.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9893348856523857 4.9327e-06  
a 96.44372223706468 0.044695 au
q 1.028583325767847 9.9061e-07 au
i 164.4633759824221 1.6429e-05 deg
node 323.272669690487 8.0352e-05 deg
peri 46.70853252896379 0.00010901 deg
M .004229622951817585 3.023e-06 deg
tp 2459275.435486919365
(2021-Mar-01.93548692)
8.1323e-05 TDB
period 345946.8434177595
947.15
240.48
0.6584
d
yr
n .001040622300360955 7.2338e-07 deg/d
Q 191.8588611483615 0.088913 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.692166822402031E-8 1.004E-9
A2 [EST] 3.469731918650164E-9 3.999E-10
  Orbit Determination Parameters
   # obs. used (total)      2023  
   data-arc span      303 days  
   first obs. used      2020-08-29  
   last obs. used      2021-06-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .61187  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-26 23:12:30  

Additional Information
 Earth MOID = .118427 au 
 Jupiter MOID = .0232225 au 
 T_jup = -1.154 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 12.2   1. 16 2 parameter fit from 1842 observations, autocmod 2.9c
comet total magnitude slope K1 13.75   n/a 16 autocmod 2.9c
comet nuclear magnitude M2 15.6   0.8 16 from 70 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 16 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 16 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2021.2   C/2020 R4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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