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C/2018 W2 (Africano)
Classification: Hyperbolic Comet          SPK-ID: 1003596
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458691.5 (2019-Jul-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000759657040413 1.105e-06  
a -1914.900592322932 2.7853 au
q 1.454667716648986 1.6496e-07 au
i 116.6157705373604 1.1463e-05 deg
node 181.8494552876912 4.9886e-06 deg
peri 157.9728542247294 1.9076e-05 deg
M -.0004790603175795458 1.0451e-06 deg
tp 2458732.229161980503
(2019-Sep-05.72916198)
2.4683e-05 TDB
period n/a
n/a
n/a
n/a
d
yr
n 1.176209610717921E-5 2.5663e-08 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      2014  
   data-arc span      566 days (1.55 yr)  
   first obs. used      2018-11-27  
   last obs. used      2020-06-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .52799  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:49  

Additional Information
 Earth MOID = .493664 au 
 Jupiter MOID = 3.14032 au 
 T_jup = -0.663 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.4   0.9 22 2 parameter fit from 1324 observations, autocmod 2.9c
comet total magnitude slope K1 4.5   n/a 22 autocmod 2.9c

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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