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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 2459287.5 (2021-Mar-14.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000083932933472 3.1546e-06  
a -7328.451020988954 275.42 au
q .615098391998108 7.0921e-06 au
i 132.6862697995699 1.2807e-05 deg
node 255.8808523877966 0.00021229 deg
peri 225.0885120569385 0.0003584 deg
M -.000463908005027495 2.6151e-05 deg
tp 2459582.788189578191
(2022-Jan-03.28818958)
0.0011613 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.571034743008759E-6 8.8566e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      997  
   data-arc span      439 days (1.20 yr)  
   first obs. used      2020-04-11  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .54328  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-07 19:11:02  

Additional Information
 Earth MOID = .231463 au 
 Jupiter MOID = .296475 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 11.6   0.5 9 2 parameter fit from 880 observations, autocmod 2.9c
comet total magnitude slope K1 6.   n/a 9 autocmod 2.9c
comet nuclear magnitude M2 12.6   0.3 9 from 35 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 9 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 9 autocmod 2.9c

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