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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 2455838.5 (2011-Oct-04.0) TDB
Reference: JPL 55 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6094745694255875 1.225e-07  
a 3.624043439590854 4.6606e-08 au
q 1.415281124666593 4.56e-07 au
i 21.92937147437639 9.864e-06 deg
node 356.4777070774762 1.9406e-05 deg
peri 13.91898130930214 5.1121e-05 deg
M 308.0080965452234 8.379e-06 deg
tp 2456202.433249884557
(2012-Oct-01.93324988)
5.7813e-05 TDB
period 2519.930243992707
6.90
4.861e-05
1.331e-07
d
yr
n .1428610973887902 2.7558e-09 deg/d
Q 5.832805754515116 7.5011e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.645935917039714E-8 1.393E-10
A2 [EST] 2.372866913427983E-9 7.879E-13
A3 [EST] -1.318022150370368E-9 7.657E-11
  Orbit Determination Parameters
   # obs. used (total)      3368  
   data-arc span      5193 days (14.22 yr)  
   first obs. used      1998-11-21  
   last obs. used      2013-02-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .86254  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-13 11:01:59  

Additional Information
 Earth MOID = .419949 au 
 Jupiter MOID = .00108521 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 7.4   1. 55 2 parameter fit from 468 observations, autocmod 2.8
comet total magnitude slope K1 42.5   n/a 55 autocmod 2.8
comet nuclear magnitude M2 15.2   1. 55 from 2495 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 55 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 55 autocmod 2.8

[ 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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