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208P/McMillan
Classification: Jupiter-family Comet          SPK-ID: 1003003
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455422.5 (2010-Aug-14.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .374392024946453 4.5345e-07  
a 4.040395456376404 1.0058e-07 au
q 2.527703619879194 1.8648e-06 au
i 4.41401381118131 4.8015e-05 deg
node 36.39911634669623 0.00015247 deg
peri 310.6453893603847 0.00017062 deg
M 99.80255728375961 1.7073e-05 deg
tp 2454600.118358558500
(2008-May-13.61835856)
0.00014954 TDB
period 2966.430910955385
8.12
0.00011077
3.033e-07
d
yr
n .1213579587073735 4.5315e-09 deg/d
Q 5.553087292873613 1.3823e-07 au
  Orbit Determination Parameters
   # obs. used (total)      220  
   data-arc span      5944 days (16.27 yr)  
   first obs. used      2000-09-23  
   last obs. used      2017-01-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .81275  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:27:55  

Additional Information
 Earth MOID = 1.52342 au 
 Jupiter MOID = .11315 au 
 T_jup = 2.917 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 2.056174915503511E-13 -8.45232875253204E-13 -1.405802304839691E-11 2.60419938226645E-11 -5.162844401214664E-11 -1.268880449094769E-11
q -8.45232875253204E-13 3.477445889929122E-12 5.32010996069208E-11 -1.072964471914743E-10 2.118389071829318E-10 5.194345683198383E-11
tp -1.405802304839691E-11 5.32010996069208E-11 2.236228098835967E-8 7.109190571916493E-9 -1.251510352266361E-9 2.954281479862612E-9
node 2.60419938226645E-11 -1.072964471914743E-10 7.109190571916493E-9 2.324656898717681E-8 -2.412839335772908E-8 -3.530782824272599E-9
peri -5.162844401214664E-11 2.118389071829318E-10 -1.251510352266361E-9 -2.412839335772908E-8 2.911188699310582E-8 5.585119873453531E-9
i -1.268880449094769E-11 5.194345683198383E-11 2.954281479862612E-9 -3.530782824272599E-9 5.585119873453531E-9 2.305450980602898E-9

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 16.1   0.8 26 2 parameter fit from 98 observations, autocmod 2.9c
comet total magnitude slope K1 4.5   n/a 26 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2008.4   208P/2008 U1       
 2000.2   208P/2000 S7       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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