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

[ hide orbit diagram ]
Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5031130574217229 3.5808e-07  
a 3.552070610991009 8.8218e-07 AU
q 1.764977505717475 1.641e-06 AU
i 21.94963377831148 2.6915e-05 deg
node 101.7169091843631 4.8896e-05 deg
peri 347.1063951041499 0.00026494 deg
M 46.58905322028546 0.00011915 deg
tp 2456048.052115556606
(2012-Apr-30.55211556)
0.00072141 JED
period 2445.236177283361
6.69
0.00091094
2.494e-06
d
yr
n .1472250424496653 5.4847e-08 deg/d
Q 5.339163716264542 1.326e-06 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -4.249309225508472E-10 4.443E-10
A2 [EST] -1.757379804528522E-9 7.841E-12
  Orbit Determination Parameters
   # obs. used (total)      336  
   data-arc span      4899 days (13.41 yr)  
   first obs. used      1998-11-13  
   last obs. used      2012-04-12  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      1  
   fit RMS      .69438  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:29:47  

Additional Information
 Earth MOID = .785821 AU 
 T_jup = 2.789 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 8.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 25.0   n/a ICQ 2005 Handbook  

[ 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 | Physical Parameters | Close-Approach Data ]
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