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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 ]

[ hide orbit diagram ]

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 2459170.5 (2020-Nov-17.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9894057017842369 4.0177e-06  
a 97.08847527903821 0.03733 au
q 1.028584260419872 5.7135e-06 au
i 164.4629010677942 3.9009e-05 deg
node 323.2732833012976 0.00014459 deg
peri 46.71457659016534 0.00031288 deg
M 359.8918828616075 6.2494e-05 deg
tp 2459275.440224680391
(2021-Mar-01.94022468)
0.00014124 TDB
period 349421.760940583
956.66
201.52
0.5517
d
yr
n .001030273555461864 5.942e-07 deg/d
Q 193.1483662976566 0.074264 au
  Orbit Determination Parameters
   # obs. used (total)      480  
   data-arc span      208 days  
   first obs. used      2020-08-29  
   last obs. used      2021-03-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .63495  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:11  

Additional Information
 Earth MOID = .117782 au 
 Jupiter MOID = .0232172 au 
 T_jup = -1.155 
[ 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 12.3   0.9 10 2 parameter fit from 393 observations, autocmod 2.9c
comet total magnitude slope K1 13.75   n/a 10 autocmod 2.9c
comet nuclear magnitude M2 14.5   0.3 10 from 4 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 10 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 10 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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