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C/2018 X2 (Fitzsimmons)
Classification: Comet          SPK-ID: 1003597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

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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.


Orbital Elements at Epoch 2458524.5 (2019-Feb-10.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .986280223636649 1.8759e-05  
a 154.9499826229357 0.2119 au
q 2.125879109091798 2.7829e-06 au
i 23.06823387310232 4.2385e-05 deg
node 340.8332096515571 0.00021888 deg
peri 162.0470445413797 0.00019378 deg
M 359.9240994056811 0.0001559 deg
tp 2458673.034863153465
(2019-Jul-08.53486315)
0.000493 TDB
period 704507.6684192494
1928.84
1445.2
3.957
d
yr
n .0005109951475869041 1.0482e-06 deg/d
Q 307.7740861367797 0.4209 au
  Orbit Determination Parameters
   # obs. used (total)      390  
   data-arc span      392 days (1.07 yr)  
   first obs. used      2018-12-08  
   last obs. used      2020-01-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .58716  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:48  

Additional Information
 Earth MOID = 1.14863 au 
 Jupiter MOID = 1.86437 au 
 T_jup = 1.691 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 10.6   0.5 11 2 parameter fit from 247 observations, autocmod 2.9c
comet total magnitude slope K1 12.75   n/a 11 autocmod 2.9c
comet nuclear magnitude M2 14.3   0.4 11 from 117 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2019.5   C/2018 X2       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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