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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 2459241.5 (2021-Jan-27.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000086449327069 9.8356e-06  
a -7114.254678753327 809.41 au
q .6150225295751119 8.0396e-06 au
i 132.6861300357353 3.3469e-05 deg
node 255.8762605718946 0.00054178 deg
peri 225.0880527619856 0.00069176 deg
M -.0005605641507650001 9.5659e-05 deg
tp 2459582.783552367617
(2022-Jan-03.28355237)
0.0045246 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.642517334562853E-6 2.8031e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      509  
   data-arc span      348 days  
   first obs. used      2020-04-11  
   last obs. used      2021-03-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .49064  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:17  

Additional Information
 Earth MOID = .230638 au 
 Jupiter MOID = .296522 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 7.9   0.5 5 2 parameter fit from 441 observations, autocmod 2.9c
comet total magnitude slope K1 11.25   n/a 5 autocmod 2.9c
comet nuclear magnitude M2 12.5   0.3 5 from 21 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 5 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 5 autocmod 2.9c

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