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385P/Hill
Classification: Jupiter-family Comet          SPK-ID: 1003109
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456223.5 (2012-Oct-23.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4023016629488966 1.1035e-06  
a 4.274675325347734 2.7574e-07 au
q 2.554966333393725 4.5755e-06 au
i 16.85633311716567 5.3787e-05 deg
node 357.1569216726919 0.00019684 deg
peri 44.32159855621951 0.001801 deg
M 79.57691056025915 0.0006532 deg
tp 2455509.928161607748
(2010-Nov-09.42816161)
0.0059138 TDB
period 3228.145702222071
8.84
0.00031235
8.552e-07
d
yr
n .1115191299302868 1.079e-08 deg/d
Q 5.994384317301743 3.8667e-07 au
  Orbit Determination Parameters
   # obs. used (total)      349  
   data-arc span      3391 days (9.28 yr)  
   first obs. used      2010-10-01  
   last obs. used      2020-01-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .72061  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-05 13:16:37  

Additional Information
 Earth MOID = 1.59151 au 
 Jupiter MOID = .360437 au 
 T_jup = 2.806 
[ 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 7.4   0.8 26 from 144 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 25.   n/a 26 autocmod 2.8
comet nuclear magnitude M2 15.8   0.7 26 from 167 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 26 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 26 autocmod 2.8

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2019.7   385P/2019 P1       
 2010.9   385P/2010 U2       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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