C/2019 Y4 ( ATLAS )

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Updated on February 20, 2021

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 31.02122 TT Rudenko q 0.2528578 (2000.0) P Q z +0.0032134 Peri. 177.41210 +0.48074928 +0.62711876 Node 120.56894 -0.81674509 +0.57458407 e 0.9991875 Incl. 45.38074 -0.31907301 -0.52590418 From 2404 observations 2019 Dec. 20-2020 Apr. 28, mean residual 1".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

The orbital elements are published on M.P.E.C. 2021-B143. The orbital elements of components A-D 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.