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C/2018 L2 (ATLAS)
Classification: Comet          SPK-ID: 1003574
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.


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Orbital Elements at Epoch 2458475.5 (2018-Dec-23.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9929885541775788 4.8217e-06  
a 244.1308428043261 0.1681 au
q 1.711710177904557 1.7391e-06 au
i 67.42360307554335 2.583e-05 deg
node 243.0183026826307 2.0124e-05 deg
peri 56.23055514475516 4.8221e-05 deg
M .005276213614090296 5.4695e-06 deg
tp 2458455.080162958157
(2018-Dec-02.58016296)
0.00010534 TDB
period 1393260.749608777
3814.54
1439
3.94
d
yr
n .0002583866660286575 2.6687e-07 deg/d
Q 486.5499754307477 0.33502 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -2.714362451544392E-8 1.604E-9
A2 [EST] -1.03317553456345E-9 1.359E-9
  Orbit Determination Parameters
   # obs. used (total)      720  
   data-arc span      996 days (2.73 yr)  
   first obs. used      2017-04-29  
   last obs. used      2020-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .55153  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:54:31  

Additional Information
 Earth MOID = .986735 au 
 Jupiter MOID = 1.13628 au 
 T_jup = 0.643 
[ hide covariance matrix ]
Orbit Covariance (8×8)
  e q tp node peri i A1 A2
e 2.324914196594052E-11 7.077385717885932E-12 3.735645862342472E-10 -1.811380524678388E-11 1.810737094163486E-10 3.660986545159309E-13 -7.047068736931553E-15 1.792640265367178E-15
q 7.077385717885932E-12 3.024413148980225E-12 1.24288216722008E-10 -9.184221476587176E-12 6.499094802518568E-11 -2.976168776369118E-12 -2.717261303661759E-15 6.57125016668044E-18
tp 3.735645862342472E-10 1.24288216722008E-10 1.109747357683307E-8 -5.478009574106252E-10 4.318669834019892E-9 1.56956728663118E-10 -1.17356170947402E-13 2.962140394219555E-14
node -1.811380524678388E-11 -9.184221476587176E-12 -5.478009574106252E-10 4.049707531401725E-10 -5.237925702512056E-10 -1.528456901568438E-10 7.871051263537174E-15 1.448172296358624E-14
peri 1.810737094163486E-10 6.499094802518568E-11 4.318669834019892E-9 -5.237925702512056E-10 2.32530642305484E-9 7.636355632830944E-11 -6.201713268908085E-14 -1.083455106819282E-14
i 3.660986545159309E-13 -2.976168776369118E-12 1.56956728663118E-10 -1.528456901568438E-10 7.636355632830944E-11 6.671857990198189E-10 2.143878640670926E-15 2.143828992662425E-15
A1 -7.047068736931553E-15 -2.717261303661759E-15 -1.17356170947402E-13 7.871051263537174E-15 -6.201713268908085E-14 2.143878640670926E-15 2.57159605096762E-18 -1.449324114395464E-19
A2 1.792640265367178E-15 6.57125016668044E-18 2.962140394219555E-14 1.448172296358624E-14 -1.083455106819282E-14 2.143828992662425E-15 -1.449324114395464E-19 1.846976921964234E-18

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 9.5   0.8 18 2 parameter fit from 396 observations, autocmod 2.8
comet total magnitude slope K1 10.75   n/a 18 autocmod 2.8
comet nuclear magnitude M2 12.0   0.6 18 from 270 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 18 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 18 autocmod 2.8

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2018.9   C/2018 L2       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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