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C/2018 A6 (Gibbs)
Classification: Halley-type Comet*          SPK-ID: 1003559
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458747.5 (2019-Sep-21.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8034723126661407 1.2286e-06  
a 15.35545222908839 9.5586e-05 au
q 3.017771514548295 4.5964e-07 au
i 76.95480648494821 2.0486e-05 deg
node 340.3862016767737 1.0327e-05 deg
peri 264.5317916899389 2.1438e-05 deg
M 1.1255576020849 1.057e-05 deg
tp 2458678.784047856932
(2019-Jul-14.28404786)
0.00015305 TDB
period 21978.21126673758
60.17
0.20522
0.0005619
d
yr
n .01637985892622816 1.5294e-07 deg/d
Q 27.69313294362848 0.00017239 au
  Orbit Determination Parameters
   # obs. used (total)      824  
   data-arc span      1611 days (4.41 yr)  
   first obs. used      2017-04-03  
   last obs. used      2021-08-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .56631  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Sep-04 23:42:57  

Additional Information
 Earth MOID = 2.7161 au 
 Jupiter MOID = .225639 au 
 T_jup = 0.801 
[ 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 8.0   0.8 43 2 parameter fit from 662 observations, autocmod 2.9e
comet total magnitude slope K1 10.   n/a 43 autocmod 2.9e
comet nuclear magnitude M2 11.3   0.9 43 from 100 observations, autocmod 2.9e
comet nuclear magnitude slope K2 5.   n/a 43 autocmod 2.9e
comet nuclear phase coefficient PC 0.03   n/a 43 autocmod 2.9e

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2019.5   C/2018 A6       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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