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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455839.5 (2011-Oct-05.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6094745194970407 1.2245e-07  
a 3.624037850445654 4.6605e-08 au
q 1.415279122906201 4.5581e-07 au
i 21.92936570454588 9.8635e-06 deg
node 356.4776709234508 1.9404e-05 deg
peri 13.91912899444852 5.1117e-05 deg
M 308.1508196349437 8.3763e-06 deg
tp 2456202.433376314254
(2012-Oct-01.93337631)
5.7794e-05 TDB
period 2519.92441448866
6.90
4.8609e-05
1.331e-07
d
yr
n .142861427878602 2.7558e-09 deg/d
Q 5.832796577985107 7.5009e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.644844860972787E-8 1.392E-10
A2 [EST] 2.37286152762647E-9 7.879E-13
A3 [EST] -1.318469081979617E-9 7.657E-11
  Orbit Determination Parameters
   # obs. used (total)      3371  
   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      .86289  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-14 17:13:19  

Additional Information
 Earth MOID = .41995 au 
 Jupiter MOID = .00107821 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. 56 2 parameter fit from 471 observations, autocmod 2.8
comet total magnitude slope K1 42.5   n/a 56 autocmod 2.8
comet nuclear magnitude M2 15.2   1. 56 from 2495 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 56 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 56 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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