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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 
[ 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 11.4   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

[ 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 13:57 00:02 Earth 0.233349879123492 0.233334096312012 0.233365662820636 70.6693369701498 70.6691753951157 2459561.081426107 1.97744370250274 1129.26136534356 366.077389315699 -49.2925537599596 74918.0924096924 T 12 CATAB v2.0g-lin.ifort 2021-Sep-20 00:12:52 2021-Sep-20 00:12
2021-Dec-18 02:12 00:02 Venus 0.0284542185760926 0.028431327152118 0.0284771142759687 78.2309184368044 78.2299428934804 2459566.591726528 1.82918467810596 1281.88826749661 378.758570884837 28.4314275732068 6080.21049338807 T 12 CATAB v2.0g-lin.ifort 2021-Sep-20 00:12:52 2021-Sep-20 00:12
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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