# Talk:Standard asteroid physical characteristics

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$\frac{GM}{r_{max}^2}$ for the surface gravity was wrong. The formula is only true for spherically symmetric bodies (see shell theorem). Maybe it's good enough as an approximation (the same applies to the escape velocity, and also to the mean temperature), but the wording (before my edit) seemed to indicate that it's an exact formula. Icek (talk) 23:13, 28 October 2008 (UTC)