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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbit Covariance (8×8)
  e q tp node peri i A1 A2
e 2.034295022231767E-13 -6.585886663965709E-13 1.439544364847831E-10 -1.606259447277415E-12 7.521432625174366E-11 -1.161225681681378E-11 1.393488718912319E-16 -4.637777391999688E-18
q -6.585886663965709E-13 2.202812437181203E-12 -4.262524523555949E-10 4.451817040357627E-12 -2.168038667287436E-10 3.634713538043725E-11 -5.218643133374513E-16 1.089536689609847E-17
tp 1.439544364847831E-10 -4.262524523555949E-10 2.195980259038835E-7 -4.188127559517539E-9 1.190573505205712E-7 -1.002514227530999E-8 8.457147538976185E-14 -5.844864313126462E-15
node -1.606259447277415E-12 4.451817040357627E-12 -4.188127559517539E-9 7.084361856403677E-10 -2.80664950327669E-9 4.769216879075802E-10 -1.524506696611829E-15 8.784036317757122E-17
peri 7.521432625174366E-11 -2.168038667287436E-10 1.190573505205712E-7 -2.80664950327669E-9 6.583141023576633E-8 -5.80954374290049E-9 3.442064787189734E-14 -3.384940016058793E-15
i -1.161225681681378E-11 3.634713538043725E-11 -1.002514227530999E-8 4.769216879075802E-10 -5.80954374290049E-9 1.134385693296003E-9 -5.380959983311553E-15 3.342536884225499E-16
A1 1.393488718912319E-16 -5.218643133374513E-16 8.457147538976185E-14 -1.524506696611829E-15 3.442064787189734E-14 -5.380959983311553E-15 2.30956465052084E-19 6.85476953602898E-22
A2 -4.637777391999688E-18 1.089536689609847E-17 -5.844864313126462E-15 8.784036317757122E-17 -3.384940016058793E-15 3.342536884225499E-16 6.85476953602898E-22 3.474789789561697E-22

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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