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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 2455537.5 (2010-Dec-07.0) TDB
Reference: JPL 63 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4873843749259671 2.046e-07  
a 3.474782087131117 2.3386e-08 au
q 1.78122759159077 7.0394e-07 au
i 11.42759535228922 2.0142e-05 deg
node 229.9848252039883 5.0294e-05 deg
peri 39.57540339998395 0.00010626 deg
M 103.6932426642518 2.6746e-05 deg
tp 2454856.044120461100
(2009-Jan-24.54412046)
0.000181 TDB
period 2365.8640653021
6.48
2.3884e-05
6.539e-08
d
yr
n .152164279123125 1.5361e-09 deg/d
Q 5.168336582671464 3.4784e-08 au
  Orbit Determination Parameters
   # obs. used (total)      587  
   data-arc span      4910 days (13.44 yr)  
   first obs. used      2002-04-14  
   last obs. used      2015-09-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57152  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 11:13:11  

Additional Information
 Earth MOID = .780685 au 
 Jupiter MOID = .313061 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 12.4   0.6 63 2 parameter fit from 224 observations, autocmod 2.8
comet total magnitude slope K1 19.25   n/a 63 autocmod 2.8
comet nuclear magnitude M2 16.4   0.6 63 from 319 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 63 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 63 autocmod 2.8

[ 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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