What should be the size of an icon showed on the browsing screen on app store?

I have successfully submitted and got approved my app in the app store. Now the problem I'm facing is my app icon has very low and blurry quality on the apps browsing screen on the app store. I have prepared and uploaded crisp and sharp PNG icon images with app binary:

Icon.png (57 x 57) Icon@2x.png (114 x 114) and the pig one with 512 x 512

I have followed apple icon guidelines (here) where only the 512 x 512 icon is mentioned as icon that will be used to app store. Thought they will use one of my icon files for the browsing pages but now I see that my small icon file 57x57 is a little bit small and my larger icon file 114x114 is a little bit large if compared on the screen when viewing my app icon on itunes. So, what should be开发者_开发问答 the app icon size for apps browsing screen?

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512 x 512 is the icon displayed in iTunes. It's scaled down when browsing AppStore or Apps library, but you can see it's the large icon in iTunes' artwork view.

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This post does a good job explaining all the different sizes

http://mrgan.tumblr.com/post/708404794/ios-app-icon-sizes

And yes, 512x512 is the correct size for the app store, though Apple resizes it on you.