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C/2021 A4 (NEOWISE)
Classification: Comet          SPK-ID: 1003756
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 2459260.5 (2021-Feb-15.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9741493749281559 8.224e-05  
a 44.31670073731321 0.14147 au
q 1.145614415181401 1.2618e-05 au
i 111.5780313553883 0.00074812 deg
node 307.0803964849998 0.00039979 deg
peri 204.6414268953249 0.0021965 deg
M 359.8897097146527 0.00053545 deg
tp 2459293.512948751061
(2021-Mar-20.01294875)
0.0021923 TDB
period 107758.0089031556
295.03
516
1.413
d
yr
n .003340818967094498 1.5998e-05 deg/d
Q 87.48778705944501 0.27929 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.073226438431971E-8 1.708E-9
A2 [EST] 2.053612489808517E-8 3.224E-9
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      99 days  
   first obs. used      2021-01-03  
   last obs. used      2021-04-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      5  
   norm. resid. RMS      .56503  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 19:11:02  

Additional Information
 Earth MOID = .208802 au 
 Jupiter MOID = 2.34451 au 
 T_jup = -0.368 
[ 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 13.6   0.6 11 2 parameter fit from 554 observations, autocmod 2.9c
comet total magnitude slope K1 28.75   n/a 11 autocmod 2.9c
comet nuclear magnitude M2 17.5   0.3 11 from 47 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2021.2   C/2021 A4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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