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20D/Westphal
Classification: Halley-type Comet* [NEO]          SPK-ID: 1000212
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2420080.5 (1913-Nov-09.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.919831188993609 2.1672e-07  
a 15.6421524304176 8.2313e-07 au
q 1.2540127619273 3.4279e-06 au
i 40.8900610587027 0.0002042 deg
node 348.0064469311446 0.00012841 deg
peri 57.08095497141959 0.00049 deg
M 359.7165728186091 8.5091e-06 deg
tp 2420098.290255874618
(1913-Nov-26.79025587)		 0.000533 TDB
period 22596.60517891492
61.87		 0.0017836
4.883e-06		 d
yr
n .01593159667789031 1.2575e-09 deg/d
Q 30.03029209890796 1.5803e-06 au
   Orbit Determination Parameters
   # obs. used (total)      201  
   data-arc span      22321 days (61.11 yr)  
   first obs. used      1852-09-01  
   last obs. used      1913-10-13  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   norm. resid. RMS      2.0333  
   source      ORB  
   producer      M.S.W. Keesey  
   solution date      2003-Apr-11 18:13:21  

Additional Information
 Earth MOID = .468283 au 
 T_jup = 1.361 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 8.8   n/a Vsekhsvyatskii,S.,Characteristics of Comets,1958  
comet total magnitude slope K1 10.0   n/a Vsekhsvyatskii,S.,Characteristics of Comets,1958  

20D/Westphal          Discovered 1852-Jul-24 by Westphal at Gottingen Observatory, Germany
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year (est.)		  New-Style 
Desig		 Roman
 Numeral 		 Year/
 Letter 
 1913.9   20D/1913 S1   1913 VI   1913d 
 1852.0   20D/1852 O1   1852 IV   
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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