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I am trying to plot a contour ellipse

ContourPlot[2.8034950798347694*10^8 + 346.6795282575007 x^2 - 
    929387.1591151787 y + 770.3723456790123 y^2 + 
    x (-623273.1898861742 + 1032.7522877535007 y) == 50000, {x, -600, 
    600}, {y, 0, 650}]

But the ellipse appears to be "broken", is there any remedy for this? On doing the same thing on WolframAlpha I got a nice smooth ellipse though.

enter image description here

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closed as off-topic by MarcoB, m_goldberg, Bob Hanlon, Öskå, C. E. Sep 5 '15 at 12:21

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – MarcoB, m_goldberg, Bob Hanlon, Öskå, C. E.
If this question can be reworded to fit the rules in the help center, please edit the question.

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ContourPlot[
 2.8034950798347694*10^8 + 346.6795282575007 x^2 - 
   929387.1591151787 y + 770.3723456790123 y^2 + 
   x (-623273.1898861742 + 1032.7522877535007 y) == 50000, {x, -600, 
  600}, {y, 0, 650}, PlotPoints -> 50]

enter image description here

Don't forget the PlotPoints.

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