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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459294.5 (2021-Mar-21.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000078366889267 2.0475e-06  
a -7849.418651362284 205.07 au
q .6151345222615522 5.036e-06 au
i 132.686245978316 1.1007e-05 deg
node 255.8809492226638 0.00017375 deg
peri 225.0876992644504 0.00023717 deg
M -.000408585660636053 1.6011e-05 deg
tp 2459582.793789272622
(2022-Jan-03.29378927)
0.00078334 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.417254466934348E-6 5.554e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      1048  
   data-arc span      526 days (1.44 yr)  
   first obs. used      2020-04-11  
   last obs. used      2021-09-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .56288  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-20 00:12:50  

Additional Information
 Earth MOID = .231021 au 
 Jupiter MOID = .296383 au 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 4.192081994897849E-12 1.334575281630003E-12 -9.827386049505114E-10 -1.428327576123552E-13 -3.230229491648667E-10 -9.891662284325784E-12
q 1.334575281630003E-12 2.536164556281682E-11 2.645684897182848E-9 2.65438755164557E-10 -7.736672338982628E-10 -2.567536477200547E-11
tp -9.827386049505114E-10 2.645684897182848E-9 6.136265048263774E-7 3.631378376238289E-8 1.834549162937983E-9 -9.129561284270717E-10
node -1.428327576123552E-13 2.65438755164557E-10 3.631378376238289E-8 3.019050606753698E-8 1.177590275050034E-8 -3.2255115407637E-10
peri -3.230229491648667E-10 -7.736672338982628E-10 1.834549162937983E-9 1.177590275050034E-8 5.625041316182313E-8 1.268883883862443E-9
i -9.891662284325784E-12 -2.567536477200547E-11 -9.129561284270717E-10 -3.2255115407637E-10 1.268883883862443E-9 1.211446046611292E-10

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 11.4   0.5 12 2 parameter fit from 921 observations, autocmod 2.9e
comet total magnitude slope K1 6.25   n/a 12 autocmod 2.9e
comet nuclear magnitude M2 12.6   0.3 12 from 38 observations, autocmod 2.9e
comet nuclear magnitude slope K2 5.   n/a 12 autocmod 2.9e
comet nuclear phase coefficient PC 0.03   n/a 12 autocmod 2.9e

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