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JPL Small-Body Database Browser
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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 2459290.5 (2021-Mar-17.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.00008177311967 2.6647e-06  
a -7522.127313532252 245.1 au
q .6151078169828911 6.5739e-06 au
i 132.6862652977663 1.2115e-05 deg
node 255.8809516554508 0.00019301 deg
peri 225.088395331965 0.00031368 deg
M -.0004415773211907738 2.1582e-05 deg
tp 2459582.789830977707
(2022-Jan-03.28983098)
0.0010117 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.51075157050008E-6 7.384e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      1024  
   data-arc span      489 days (1.34 yr)  
   first obs. used      2020-04-11  
   last obs. used      2021-08-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .54459  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-04 23:43:09  

Additional Information
 Earth MOID = .231467 au 
 Jupiter MOID = .296463 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 11 2 parameter fit from 900 observations, autocmod 2.9e
comet total magnitude slope K1 6.   n/a 11 autocmod 2.9e
comet nuclear magnitude M2 12.6   0.3 11 from 38 observations, autocmod 2.9e
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.9e
comet nuclear phase coefficient PC 0.03   n/a 11 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 13:54 00:03 Earth 0.233372467473651 0.233352601215991 0.233392335346659 70.6704864142413 70.670324857474 2459561.079443017 2.53896480662899 1499.84597813388 505.896743114903 -52.8957894027341 56709.4099543101 T 11 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:11 2021-Sep-04 23:43
2021-Dec-18 02:09 00:02 Venus 0.0284942973098566 0.0284631950277246 0.028525405663756 78.2323744551983 78.231400302167 2459566.589876343 2.34502583904956 1700.6490478892 526.779235721508 25.5478499036343 4147.74464301347 T 11 CATAB v2.0g-lin.ifort 2021-Sep-04 23:43:11 2021-Sep-04 23:43
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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