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C/2021 A1 (Leonard)
Classification: Hyperbolic Comet          SPK-ID: 1003751
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 2459255.5 (2021-Feb-10.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000097091543852 5.904e-06  
a -6334.697030737982 385.19 au
q .6150455145494623 7.8224e-06 au
i 132.6862156505232 2.021e-05 deg
node 255.8782136373354 0.0003611 deg
peri 225.0877384372308 0.00053798 deg
M -.0006397858450716127 5.8351e-05 deg
tp 2459582.779894519014
(2022-Jan-03.27989452)
0.0023126 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.95485838203374E-6 1.783e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      613  
   data-arc span      385 days (1.05 yr)  
   first obs. used      2020-04-11  
   last obs. used      2021-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .50469  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-02 23:42:50  

Additional Information
 Earth MOID = .231005 au 
 Jupiter MOID = .296419 au 
[ 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 10.0   0.5 6 2 parameter fit from 540 observations, autocmod 2.9c
comet total magnitude slope K1 8.25   n/a 6 autocmod 2.9c
comet nuclear magnitude M2 12.5   0.3 6 from 21 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 6 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 6 autocmod 2.9c

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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