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251P/LINEAR
Classification: Jupiter-family Comet          SPK-ID: 1000495
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2453813.5 (2006-Mar-19.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5097838091900158 4.5103e-07  
a 3.491387520746516 5.9051e-07 au
q 1.711534691061872 1.4842e-06 au
i 23.5097808150622 3.3681e-05 deg
node 219.5544197659631 2.6616e-05 deg
peri 30.87913279279607 0.00025658 deg
M 96.41549159793094 8.6948e-05 deg
tp 2453175.324938388360
(2004-Jun-18.82493839)
0.00046861 TDB
period 2382.843445307088
6.52
0.00060453
1.655e-06
d
yr
n .151080005154768 3.8329e-08 deg/d
Q 5.27124035043116 8.9155e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 5.157078889980294E-9 4.806E-10
A2 [EST] 2.239543052419328E-10 1.864E-11
  Orbit Determination Parameters
   # obs. used (total)      401  
   data-arc span      4905 days (13.43 yr)  
   first obs. used      2004-04-17  
   last obs. used      2017-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .67964  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Oct-03 10:47:43  

Additional Information
 Earth MOID = .732911 au 
 Jupiter MOID = .210227 au 
 T_jup = 2.783 
[ 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 9.6   1. 32 2 parameter fit from 167 observations, autocmod 2.6i
comet total magnitude slope K1 34.   n/a 32 autocmod 2.6i
comet nuclear magnitude M2 17.1   0.9 32 from 134 observations, autocmod 2.6i
comet nuclear magnitude slope K2 5.   n/a 32 autocmod 2.6i
comet nuclear phase coefficient PC 0.03   n/a 32 autocmod 2.6i

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2011.0   251P/2011 J1       
 2004.5   251P/2004 HC18       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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