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C/2018 DO4 (Lemmon)
Classification: Halley-type Comet*          SPK-ID: 1003642
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458603.5 (2019-Apr-30.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9069431691503352 1.0163e-06  
a 25.85435663753577 0.00028559 au
q 2.405924492346074 5.1108e-07 au
i 160.4749772466273 9.4938e-06 deg
node 251.1326026858089 2.3427e-05 deg
peri 175.977605046222 3.4139e-05 deg
M 359.1721578627524 1.4175e-05 deg
tp 2458713.919062929646
(2019-Aug-18.41906293)
9.0834e-05 TDB
period 48017.4430197959
131.46
0.7956
0.002178
d
yr
n .00749727551822334 1.2422e-07 deg/d
Q 49.30278878272547 0.0005446 au
  Orbit Determination Parameters
   # obs. used (total)      656  
   data-arc span      1590 days (4.35 yr)  
   first obs. used      2016-04-05  
   last obs. used      2020-08-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .41118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-02 23:42:38  

Additional Information
 Earth MOID = 1.42033 au 
 Jupiter MOID = 1.56851 au 
 T_jup = -1.569 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7   n/a E2018Y96  
comet total magnitude M1 13.1   0.6 36 2 parameter fit from 702 observations, autocmod 2.9c
comet total magnitude slope K1 6.75   n/a 36 autocmod 2.9c
comet nuclear magnitude M2 13.8   0.1 36 from 6 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 36 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 36 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2019.6   C/2018 DO4       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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