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C/2019 Y4-D (ATLAS)
Classification: Halley-type Comet* [NEO]          SPK-ID: 1003675
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458953.5 (2020-Apr-14.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9898679875903229 0.0046785  
a 25.09303807032235 11.388 au
q .2542429731250058 0.0020356 au
i 44.95467243950517 0.49347 deg
node 120.6559390884409 0.27222 deg
peri 177.7425034424157 0.23542 deg
M 359.630362575582 0.25181 deg
tp 2459000.641319005360
(2020-May-31.14131901)
0.023756 TDB
period 45912.22024839774
125.70
31255
85.57
d
yr
n .007841049682465823 0.0053378 deg/d
Q 49.9318331675197 22.661 au
  Orbit Determination Parameters
   # obs. used (total)      74  
   data-arc span      8 days  
   first obs. used      2020-04-09  
   last obs. used      2020-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      9  
   norm. resid. RMS      .89276  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2020-Jun-17 10:04:16  

Additional Information
 Earth MOID = .626411 au 
 Jupiter MOID = 1.32993 au 
 T_jup = 0.649 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.3   1. 7 2 parameter fit from 48 observations, autocmod 2.8
comet total magnitude slope K1 4.5   n/a 7 autocmod 2.8
comet nuclear magnitude M2 15.5   0.3 7 from 17 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a 7 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a 7 autocmod 2.8

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2020.4   C/2019 Y4-D       
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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