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221P/LINEAR
Classification: Jupiter-family Comet          SPK-ID: 1000393
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455576.5 (2011-Jan-15.0) TDB
Reference: JPL 67 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4874071390337911 2.2719e-07  
a 3.474477290256597 1.3716e-07 au
q 1.78099225457475 8.273e-07 au
i 11.42830130925585 1.9777e-05 deg
node 229.9853265169021 4.8978e-05 deg
peri 39.56434566500335 9.3342e-05 deg
M 109.6463350655327 2.4884e-05 deg
tp 2454856.016130395075
(2009-Jan-24.51613040)
0.0001891 TDB
period 2365.552782979495
6.48
0.00014008
3.835e-07
d
yr
n .1521843023712063 9.0118e-09 deg/d
Q 5.167962325938444 2.0402e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.338920335334547E-11 5.25E-12
  Orbit Determination Parameters
   # obs. used (total)      593  
   data-arc span      6884 days (18.85 yr)  
   first obs. used      2002-04-14  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56314  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:27:57  

Additional Information
 Earth MOID = .783112 au 
 Jupiter MOID = .312942 au 
 T_jup = 2.896 
[ 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 13.5   0.6 67 2 parameter fit from 230 observations, autocmod 2.9c
comet total magnitude slope K1 15.   n/a 67 autocmod 2.9c
comet nuclear magnitude M2 16.4   0.6 67 from 319 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 67 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 67 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2009.1   221P/2009 L1       
 2002.6   221P/2002 JN16       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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