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357P/Hill
Classification: Jupiter-family Comet          SPK-ID: 1003002
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455170.5 (2009-Dec-05.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4354856329732328 7.3613e-07  
a 4.449559860092437 1.7112e-06 au
q 2.511840467967793 2.407e-06 au
i 6.325985088819189 3.5966e-05 deg
node 44.67502958150783 0.00012807 deg
peri 1.288453302995562 0.001151 deg
M 36.32821426302266 0.00043855 deg
tp 2454824.548229907647
(2008-Dec-24.04822991)
0.0039785 TDB
period 3428.262020575426
9.39
0.0019777
5.415e-06
d
yr
n .1050094764750726 6.0577e-08 deg/d
Q 6.387279252217081 2.4564e-06 au
  Orbit Determination Parameters
   # obs. used (total)      293  
   data-arc span      3750 days (10.27 yr)  
   first obs. used      2008-09-28  
   last obs. used      2019-01-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      1  
   norm. resid. RMS      .64696  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:34  

Additional Information
 Earth MOID = 1.52114 au 
 Jupiter MOID = .236612 au 
 T_jup = 2.824 
[ 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 5.1   0.8 24 2 parameter fit from 151 observations, autocmod 2.9c
comet total magnitude slope K1 29.75   n/a 24 autocmod 2.9c
comet nuclear magnitude M2 15.4   0.7 24 from 108 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 24 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 24 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2018.4   357P/2017 Q1       
 2009.0   357P/2008 T4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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