AKATSUKI, the Japanese Venus explorer, once failed to inject itself into an orbit around Venus in 2010. AKATSUKI is now on its way to re-encounter Venus in 2015. However, due to a malfunction in the propulsion system, AKATSUKI can be only injected into the orbit much higher than that originally planned. It causes a couple of issues to be considered in its orbit design around Venus. One of which is long eclipse, which is the main topic of this paper. This paper introduces an orbit design strategy to avoid the long eclipse. An example of design result is shown as well.
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