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C/2021 A7 (NEOWISE)
Classification: Comet          SPK-ID: 1003759
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.


Orbital Elements at Epoch 2459256.5 (2021-Feb-11.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9996025302149673 0.00010801  
a 4950.485632555212 1345.3 au
q 1.967668460179411 3.7249e-05 au
i 78.14839027150457 0.00070451 deg
node 154.5200129052184 0.0013781 deg
peri 356.0677932188909 0.0017116 deg
M 359.9995632833275 0.00017803 deg
tp 2459410.836058552839
(2021-Jul-15.33605855)
0.0046001 TDB
period 127224318.5984111
348321.20
5.186e+07
1.42e+05
d
yr
n 2.829647696022292E-6 1.1534e-06 deg/d
Q 9899.003596650246 2690.1 au
  Orbit Determination Parameters
   # obs. used (total)      177  
   data-arc span      73 days  
   first obs. used      2021-01-09  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .38907  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:17  

Additional Information
 Earth MOID = .979723 au 
 Jupiter MOID = 3.42792 au 
 T_jup = 0.358 
[ 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 13.5   0.7 7 2 parameter fit from 138 observations, autocmod 2.9c
comet total magnitude slope K1 4.5   n/a 7 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2021.5   C/2021 A7       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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