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171P/Spahr
Classification: Jupiter-family Comet          SPK-ID: 1000239
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2457879.5 (2017-May-06.0) TDB
Reference: JPL K193/2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5020210572590079 2.5221e-07  
a 3.557042670751964 2.9475e-07 au
q 1.771332348465658 8.4373e-07 au
i 21.93636624712738 2.2114e-05 deg
node 101.7081664638199 3.2137e-05 deg
peri 347.1878637277071 0.00021453 deg
M 269.2411652500624 6.254e-05 deg
tp 2458497.258102152914
(2019-Jan-13.75810215)
0.00046361 TDB
period 2450.37210303322
6.71
0.00030457
8.339e-07
d
yr
n .1469164620158588 1.8261e-08 deg/d
Q 5.34275299303827 4.4272e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 8.733649604812487E-9 6.45E-10
A2 [EST] -1.946692217729362E-9 8.616E-12
  Orbit Determination Parameters
   # obs. used (total)      632  
   data-arc span      4969 days (13.60 yr)  
   first obs. used      2005-09-01  
   last obs. used      2019-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .6296  
   source      ORB  
   producer      Javier Roa  
   solution date      2019-Dec-04 08:47:03  

Additional Information
 Earth MOID = .793353 au 
 Jupiter MOID = .00484774 au 
 T_jup = 2.789 
[ 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 12.2   0.8 K193/2 2 parameter fit from 359 observations, autocmod 2.8
comet total magnitude slope K1 20.   n/a K193/2 autocmod 2.8
comet nuclear magnitude M2 16.8   0.6 K193/2 from 225 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K193/2 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K193/2 autocmod 2.8

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2005.6   171P/2005 R3       
 1998.9   171P/1998 W1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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