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JPL Small-Body Database Browser
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168P/Hergenrother
Classification: Jupiter-family Comet          SPK-ID: 1000242
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL 54 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .609558895880292 9.2199e-08  
a 3.623703022347536 2.495e-07 au
q 1.414842609047295 4.0546e-07 au
i 21.927923150458 1.067e-05 deg
node 356.4566376041315 2.4664e-05 deg
peri 13.95118353211078 7.8838e-05 deg
M 23.152291992926 1.3438e-05 deg
tp 2456202.461276046711
(2012-Oct-01.96127605)
8.3182e-05 TDB
period 2519.575195449657
6.90
0.00026022
7.124e-07
d
yr
n .1428812288079985 1.4757e-08 deg/d
Q 5.832563435647778 4.0159e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.658667734548654E-8 1.313E-10
A2 [EST] 2.372443532726665E-9 7.827E-13
A3 [EST] -1.254041926487453E-9 7.304E-11
  Orbit Determination Parameters
   # obs. used (total)      3336  
   data-arc span      5193 days (14.22 yr)  
   first obs. used      1998-11-21  
   last obs. used      2013-02-08  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   norm. resid. RMS      .99514  
   source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:29:35  

Additional Information
 Earth MOID = .417969 au 
 T_jup = 2.663 
[ 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 7.0   1. 54 2 parameter fit from 463 observations, autocmod 2.5b
comet total magnitude slope K1 45.   n/a 54 autocmod 2.5b
comet nuclear magnitude M2 15.2   1. 54 from 2452 observations, autocmod 2.5b
comet nuclear magnitude slope K2 5.   n/a 54 autocmod 2.5b
comet nuclear phase coefficient PC 0.03   n/a 54 autocmod 2.5b

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2005.9   168P/2005 N2       
 1999.0   168P/1998 W2       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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