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228P/LINEAR
Classification: Jupiter-family Comet          SPK-ID: 1000381
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455448.5 (2010-Sep-09.0) TDB
Reference: JPL 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1766454332532139 1.6858e-07  
a 4.166353390255733 8.6527e-08 au
q 3.430386090548013 7.1389e-07 au
i 7.915416588600387 1.1034e-05 deg
node 31.06750998857755 0.00010796 deg
peri 114.8462918360202 0.00013835 deg
M 319.5287437093379 6.811e-05 deg
tp 2455797.702036631235
(2011-Aug-24.20203663)
0.0005906 TDB
period 3106.222655515892
8.50
9.6765e-05
2.649e-07
d
yr
n .115896392475513 3.6104e-09 deg/d
Q 4.902320689963454 1.0181e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.045374841907068E-10 3.933E-12
ALN [SET] .0408373333128795 n/a
NK [SET] 2.6 n/a
NM [SET] 2. n/a
NN [SET] 3. n/a
R0 [SET] 5. n/a
  Orbit Determination Parameters
   # obs. used (total)      402  
   data-arc span      6741 days (18.46 yr)  
   first obs. used      2001-12-09  
   last obs. used      2020-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .77186  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-02 00:45:32  

Additional Information
 Earth MOID = 2.45123 au 
 Jupiter MOID = .325786 au 
 T_jup = 2.994 
[ 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 9.7   0.6 69 2 parameter fit from 264 observations, autocmod 2.8
comet total magnitude slope K1 13.75   n/a 69 autocmod 2.8
comet nuclear magnitude M2 14.4   0.5 69 from 84 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 69 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 69 autocmod 2.8

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2011.6   228P/2009 U2       
 2003.1   228P/2001 YX127       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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