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C/2017 A3 (Elenin)
Classification: Comet          SPK-ID: 1003493
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457794.5 (2017-Feb-10.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9110761633788587 3.5375e-05  
a 43.34656303172548 0.017384 au
q 3.854542689121162 1.3976e-05 au
i 98.50847736711791 8.4219e-05 deg
node 97.90394337289965 0.00011801 deg
peri 304.1075321626525 0.00062079 deg
M .03589856447896829 2.3211e-05 deg
tp 2457784.105466338116
(2017-Jan-30.60546634)
0.0035204 TDB
period 104239.046117584
285.39
62.709
0.1717
d
yr
n .003453600290949629 2.0776e-06 deg/d
Q 82.8385833743298 0.033223 au
  Orbit Determination Parameters
   # obs. used (total)      186  
   data-arc span      330 days  
   first obs. used      2017-01-05  
   last obs. used      2017-12-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .49915  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:33:28  

Additional Information
 Earth MOID = 3.21827 au 
 Jupiter MOID = .262787 au 
 T_jup = -0.232 
[ hide covariance matrix ]
Orbit Covariance (6×6)
  e q tp node peri i
e 1.251407572221194E-9 4.41727216747219E-10 -1.82387869806698E-8 -3.781637939577358E-10 -4.511568729525491E-9 -7.42462484320018E-10
q 4.41727216747219E-10 1.953367814571328E-10 8.488449457595968E-9 -2.444778991374355E-10 9.576541729628891E-10 -2.662186649939235E-10
tp -1.82387869806698E-8 8.488449457595968E-9 1.239297076918419E-5 -3.958069629398368E-8 2.17904208053369E-6 1.424828114408251E-8
node -3.781637939577358E-10 -2.444778991374355E-10 -3.958069629398368E-8 1.392544267258415E-8 -4.36989999233158E-9 -8.763967796324272E-9
peri -4.511568729525491E-9 9.576541729628891E-10 2.17904208053369E-6 -4.36989999233158E-9 3.853843435868132E-7 1.975821565752717E-9
i -7.42462484320018E-10 -2.662186649939235E-10 1.424828114408251E-8 -8.763967796324272E-9 1.975821565752717E-9 7.092916540110646E-9

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 9.7   0.5 13 from 123 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 10.   n/a 13 autocmod 2.9c
comet nuclear magnitude M2 13.2   0.5 13 from 45 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 13 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 13 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2017.1   C/2017 A3       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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