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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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2021-Dec-12 13:54 00:12 Earth 0.233374039577333 0.233339415053154 0.233408705403054 70.6706321103683 70.6704705550223 2459561.079407995 11.9791535165275 5837.56102742631 826.991842421479 -74.7824643298701 40699.8484446841 T 5 CATAB v2.0g-lin.ifort 2021-Apr-15 23:34:18 2021-Apr-15 23:34
2021-Dec-18 02:09 00:11 Venus 0.028497520840727 0.0283637454176876 0.028631302930376 78.2325312597717 78.2315572188859 2459566.589828475 10.8215900770931 6706.92216236491 864.545806583154 5.98238948367356 810.061952993684 T 5 CATAB v2.0g-lin.ifort 2021-Apr-15 23:34:18 2021-Apr-15 23:34
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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