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C/2017 W2 (Leonard)
Classification: Halley-type Comet*          SPK-ID: 1003548
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458113.5 (2017-Dec-26.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7112567233701367 2.2658e-05  
a 13.70534769607005 0.0011124 au
q 3.957327001114813 1.2788e-05 au
i 98.17929056760482 0.00022593 deg
node 312.8090619476837 3.0557e-05 deg
peri 169.1577142195117 0.0010709 deg
M 1.050179075105413 0.00018582 deg
tp 2458059.437718010964
(2017-Nov-01.93771801)
0.0065945 TDB
period 18532.47886709168
50.74
2.2563
0.006177
d
yr
n .01942535602397237 2.365e-06 deg/d
Q 23.45336839102528 0.0019036 au
  Orbit Determination Parameters
   # obs. used (total)      169  
   data-arc span      384 days (1.05 yr)  
   first obs. used      2017-04-23  
   last obs. used      2018-05-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      4  
   norm. resid. RMS      .47681  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:38  

Additional Information
 Earth MOID = 2.98485 au 
 Jupiter MOID = 1.33056 au 
 T_jup = 0.055 
[ 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 10.9   0.5 12 from 141 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 10.   n/a 12 autocmod 2.9c
comet nuclear magnitude M2 14.0   0.7 12 from 26 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 12 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 12 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2017.8   C/2017 W2       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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