CONSTRAINING SATURN'S CORE PROPERTIES BY A MEASUREMENT OF ITS MOMENT OF INERTIA—IMPLICATIONS TO THE CASSINI SOLSTICE MISSION
CONSTRAINING SATURN'S CORE PROPERTIES BY A MEASUREMENT OF ITS MOMENT OF INERTIA—IMPLICATIONS TO THE CASSINI SOLSTICE MISSION
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通过测量土星转动惯量来限制土星的核心特性——对卡西尼号至日任务的影响
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发表时间：
2011
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通讯作者：
R. Helled
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作者：
R. Helled
了解土星的轴向转动惯量可以提供关于其内部结构的有价值的信息。我们建议，土星的角动量可以由至日任务(卡西尼号XXM)通过测量土星的极进动速率和航天器上的透镜-Thirring加速度来确定，从而限制土星的惯性矩。结果表明，由于内核性质的不同，土星的转动惯量变化最大可达∼2%。然而，需要确定土星的自转速度来限制其轴向转动惯量。旋转周期约7分钟的变化会导致不同的核心属性(质量、半径)导致惯性矩值的类似不确定度。通过至日任务确定土星的角动量和自转周期，可以揭示关于土星内部结构的重要信息，特别是它的核心属性。
Knowledge of Saturn's axial moment of inertia can provide valuable information on its internal structure. We suggest that Saturn's angular momentum may be determined by the Solstice Mission (Cassini XXM) by measuring Saturn's pole precession rate and the Lense–Thirring acceleration on the spacecraft, and therefore put constraints on Saturn's moment of inertia. It is shown that Saturn's moment of inertia can change up to ∼2% due to different core properties. However, a determination of Saturn's rotation rate is required to constrain its axial moment of inertia. A change of about seven minutes in rotation period leads to a similar uncertainty in the moment of inertia value as different core properties (mass, radius). A determination of Saturn's angular momentum and rotation period by the Solstice Mission could reveal important information on Saturn's internal structure, in particular, its core properties.