C/2019 Y4 ( ATLAS )

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Updated on May 24, 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-A (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.04040 TT                                  Spoto                   
q   0.2507919            (2000.0)            P               Q                  
z  -0.0068695      Peri.  177.22357     +0.48490396     +0.62126451             
 +/-0.0003961      Node   120.95924     -0.81559621     +0.57530697             
e   1.0017228      Incl.   45.87408     -0.31570708     -0.53202660             
From 652 observations 2020 Mar. 23-Apr. 20, mean residual 1".0.                 
                                                                                
    C/2019 Y4-B (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.02165 TT                                  Spoto                   
q   0.2525301            (2000.0)            P               Q                  
z  +0.0012233      Peri.  177.38004     +0.48129947     +0.62625146             
 +/-0.0001352      Node   120.62540     -0.81662843     +0.57462198             
e   0.9996911      Incl.   45.45776     -0.31854173     -0.52689533             
From 815 observations 2020 Mar. 31-May 10, mean residual 1".0.                  
                                                                                
    C/2019 Y4-C (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 30.99561 TT                                  Spoto                   
q   0.2519620            (2000.0)            P               Q                  
z  -0.0100792      Peri.  177.25584     +0.48054544     +0.62517957             
 +/-0.0010647      Node   120.65888     -0.81760632     +0.57301267             
e   1.0025396      Incl.   45.63797     -0.31716871     -0.52991224             
From 450 observations 2020 Apr. 6-May 2, mean residual 1".1.                    
                                                                                
    C/2019 Y4-D (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.12426 TT                                  Spoto                   
q   0.2601438            (2000.0)            P               Q                  
n   0.01807734     Peri.  178.26197     +0.47553855     +0.64334047             
a  14.3784825      Node   119.65868     -0.81520531     +0.57860127             
e   0.9819074      Incl.   43.66455     -0.33061063     -0.50133184             
P  54.5                                                                         
From 83 observations 2020 Apr. 9-21, mean residual 0".9.                        
                                                                                
    C/2019 Y4 (ATLAS)
Epoch 2020 May 31.0 TT = JDT 2459000.5                                          
T 2020 May 31.02666 TT                                  Spoto                   
q   0.2528989            (2000.0)            P               Q                  
z  +0.0082462      Peri.  177.39716     +0.48062314     +0.62720512             
                   Node   120.57130     -0.81687653     +0.57439269             
e   0.9979145      Incl.   45.38316     -0.31892652     -0.52601025             
From 1626 observations 2019 Dec. 20-2020 Apr. 3, mean residual 0".6.            
     Nongravitational parameters A1 = +16.16, A2 = -2.1739.                     

* 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-K131.
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.