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420P/Hill (2021 E1)
Classification: Jupiter-family Comet          SPK-ID: 1003033
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459285.5 (2021-Mar-12.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4953652898405974 10.672  
a 5.526191664097905 130.55 au
q 2.788708128697353 75.411 au
i 14.51438320290966 42.285 deg
node 174.0939324389452 498.4 deg
peri 156.9333369401475 2797.8 deg
M 326.896906502454 1411.3 deg
tp 2459721.818293374469
(2022-May-22.31829337)
3163.1 TDB
period 4745.012293985545
12.99
1.6815e+05
460.4
d
yr
n .07586913957131609 2.6886 deg/d
Q 8.263675199498456 195.23 au
  Orbit Determination Parameters
   # obs. used (total)      7  
   data-arc span      3 days  
   first obs. used      2021-03-11  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      9  
   norm. resid. RMS      .40626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:28:47  

Additional Information
 Earth MOID = 1.7835 au 
 Jupiter MOID = .707543 au 
 T_jup = 2.675 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.9   0.3 16 from 7 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 10.   n/a 16 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2022.4   420P/2021 E1       
 2009.4   420P/2009 Q1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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