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C/2018 C2 (Lemmon)
Classification: Hyperbolic Comet          SPK-ID: 1003566
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458258.5 (2018-May-20.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.001806557266361 4.7958e-06  
a -1083.00607841747 2.8741 au
q 1.956512500478245 1.8208e-06 au
i 34.45339330967993 3.9994e-05 deg
node 91.13971561497642 4.5884e-05 deg
peri 134.1384875611278 0.00014738 deg
M -.0003656942054815255 1.462e-06 deg
tp 2458271.723924047784
(2018-Jun-02.22392405)
0.00026577 TDB
period n/a
n/a
n/a
n/a
d
yr
n 2.765398562182507E-5 1.1008e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      1672  
   data-arc span      272 days  
   first obs. used      2018-01-28  
   last obs. used      2018-10-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .27461  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Sep-02 22:13:59  

Additional Information
 Earth MOID = 1.06202 au 
 Jupiter MOID = 1.40517 au 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 2.299958002420052E-11 8.28715360792422E-12 1.090830581631268E-9 -1.962336223630801E-10 6.117296651548121E-10 1.836332947856562E-10
q 8.28715360792422E-12 3.315302605991063E-12 3.569701321718222E-10 -7.353087051833024E-11 2.007904523341936E-10 6.893670338654586E-11
tp 1.090830581631268E-9 3.569701321718222E-10 7.063555447216184E-8 -9.592313078619417E-9 3.88968970628335E-8 9.018426812114706E-9
node -1.962336223630801E-10 -7.353087051833024E-11 -9.592313078619417E-9 2.105305052093007E-9 -5.674786985623231E-9 -1.757881779275E-9
peri 6.117296651548121E-10 2.007904523341936E-10 3.88968970628335E-8 -5.674786985623231E-9 2.172191268347718E-8 5.153028352629954E-9
i 1.836332947856562E-10 6.893670338654586E-11 9.018426812114706E-9 -1.757881779275E-9 5.153028352629954E-9 1.599540483972468E-9

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 7.6   0.6 11 2 parameter fit from 1056 observations, autocmod 2.8
comet total magnitude slope K1 26.5   n/a 11 autocmod 2.8
comet nuclear magnitude M2 14.8   0.4 11 from 525 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.8
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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