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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5097837984601545 4.5056e-07  
a 3.491387576606857 5.9035e-07 au
q 1.71153475590762 1.4827e-06 au
i 23.50977787668653 3.3678e-05 deg
node 219.5544176119033 2.6532e-05 deg
peri 30.87910690654265 0.00025638 deg
M 96.41550122316414 8.6875e-05 deg
tp 2453175.324859363156
(2004-Jun-18.82485936)
0.00046808 TDB
period 2382.843502493428
6.52
0.00060436
1.655e-06
d
yr
n .1510800015289686 3.8319e-08 deg/d
Q 5.271240397306095 8.913e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 5.057123050013494E-9 4.799E-10
A2 [EST] 2.228384340510445E-10 1.863E-11
  Orbit Determination Parameters
   # obs. used (total)      402  
   data-arc span      4905 days (13.43 yr)  
   first obs. used      2004-04-17  
   last obs. used      2017-09-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      1  
   norm. resid. RMS      .68502  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:05  

Additional Information
 Earth MOID = .732911 au 
 Jupiter MOID = .210226 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 9.5   1. 33 2 parameter fit from 167 observations, autocmod 2.9c
comet total magnitude slope K1 34.5   n/a 33 autocmod 2.9c
comet nuclear magnitude M2 17.1   0.9 33 from 134 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 33 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 33 autocmod 2.9c

[ 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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