Ayn Rand wanted to go beyond creating a political ideology and was trying to create a fully fleshed-out philosophy (with political implications).

The politics of Objectivism are basically Anarcho-Capitalism though, and you could think of Libertarians as more moderate, pragmatic Anarcho-Capitalists with achievable policy goals.

Basically, Objectivists largely support Libertarian policies, but argue that they don't go far enough.