C/2019 Y4 ( ATLAS )

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Updated on October 6, 2020

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* Profile

Discovery Date December 28, 2019
Magnitude 19.6 mag
Discoverer Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program

* Pictures

* Orbital Elements

    C/2019 Y4 (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.03484 TT                                  Spoto                   
q   0.2531025            (2000.0)            P               Q                  
z  +0.0103679      Peri.  177.34897     +0.48009776     +0.62760704             
                   Node   120.57145     -0.81735825     +0.57370674             
e   0.9973759      Incl.   45.38328     -0.31848333     -0.52627937             
From 1185 observations 2019 Dec. 20-2020 Mar. 22, mean residual 0".6.           
     Nongravitational parameters A1 = +29.97, A2 = +0.8135.                     
                                                                                
    C/2019 Y4-A (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.04214 TT                                  Spoto                   
q   0.2510026            (2000.0)            P               Q                  
z  -0.0052905      Peri.  177.24471     +0.48462757     +0.62178606             
 +/-0.0003667      Node   120.92775     -0.81563091     +0.57534707             
e   1.0013279      Incl.   45.82500     -0.31604167     -0.53137354             
From 936 observations 2020 Mar. 21-Apr. 18, mean residual 0".8.                 
                                                                                
    C/2019 Y4-B (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.02092 TT                                  Spoto                   
q   0.2525274            (2000.0)            P               Q                  
z  +0.0009780      Peri.  177.37805     +0.48125048     +0.62625836             
 +/-0.0000584      Node   120.62356     -0.81666246     +0.57457344             
e   0.9997530      Incl.   45.45963     -0.31852850     -0.52694006             
From 942 observations 2020 Mar. 23-May 10, mean residual 0".8.                  
                                                                                
    C/2019 Y4-C (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.00038 TT                                  Spoto                   
q   0.2520522            (2000.0)            P               Q                  
z  -0.0081150      Peri.  177.27810     +0.48068906     +0.62535133             
 +/-0.0006372      Node   120.65341     -0.81742715     +0.57330554             
e   1.0020454      Incl.   45.60733     -0.31741280     -0.52939255             
From 405 observations 2020 Apr. 5-May 2, mean residual 0".8.                    
                                                                                
    C/2019 Y4-D (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.11747 TT                                  Spoto                   
q   0.2514521            (2000.0)            P               Q                  
z  +0.0149269      Peri.  177.41693     +0.48802879     +0.62161983             
 +/-0.0119158      Node   121.03409     -0.81307653     +0.57903978             
e   0.9962466      Incl.   45.64866     -0.31738692     -0.52754310             
From 163 observations 2020 Apr. 7-18, mean residual 0".8.                       

* Finding Charts

* Magnitudes Graph

        m1 = -0.5 + 5 log d + 36   log r          [   ,-71]  (             - 2020 Mar. 21)
        m1 =  9.7 + 5 log d +  4   log r(t + 67)  [-71,  0]  (2020 Mar. 21 - 2020 May  31)
        m1 = 16.5 + 5 log d + 10.0 log r          [  0,   ]  (2020 May  31 -             )

        * Gray curve is:  m1 = 5.5 + 5 log d + 10.0 log r

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The orbital elements are published on M.P.E.C. 2020-L06.
The charts are made with StellaNavigator Ver.10 (AstroArts).
The magnitudes graphs are made with Comet for Windows.

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Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.