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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Water production rate of the Jupiter-family comet 46P/Wirtanen in the 2008 apparition with the subaru telescope/IRCS
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Water production rate of the Jupiter-family comet 46P/Wirtanen in the 2008 apparition with the subaru telescope/IRCS

机译：2008年使用斯巴鲁望远镜/ IRCS观测的木星-家庭彗星46P / Wirtanen的产水率

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摘要

We present the water production rate ot comet 46P/Wirtanen in its 2008 apparition, determined from highdispersion near-infrared spectroscopic observations. Comet 46P/Wirtanen, one of Jupiter-family comets, was the target of the ROSETTA mission in the past. Observations of comet 46P were carried out in the middle of 2008 February with the Subaru telescope and Infrared Camera and Spectrograph (IRCS) instrument. We detected three water emission lines, and the water production rate was determined to be (1.7 ± 0.2) x 10 ~(28) molecules s~(-1) on 2008 February 19 near the perihelion passage of the comet. This was the first direct detection of water in the coma of comet 46P. We compared our result with the water production rate determined from radio observations near the perihelion passage in the same apparition, and we found that the rate of radio observations is consistent with our value within ±2σ errors. We also compared the water production rates observed in the 2008 apparition with other results observed in the 1997 apparition. We found that the water production rates in 2008 are consistent with those in 1997. There was no secular change of water production rates around its perihelion passage in recent decades for comet 46P.
机译：我们根据高分散的近红外光谱观测结果确定了彗星46P / Wirtanen在其2008年的产水量。木星家族彗星之一的46P / Wirtanen彗星过去曾是ROSETTA任务的目标。在2008年2月中旬，使用Subaru望远镜和红外照相机和光谱仪（IRCS）仪器对46P彗星进行了观测。我们检测到了3条水排放线，并在2008年2月19日靠近彗星的近日点通过确定了产水速率为（1.7±0.2）x 10〜（28）分子s〜（-1）。这是对彗星46P昏迷中水的首次直接检测。我们将我们的结果与根据相同幻影在近日点附近通过无线电观测确定的产水率进行了比较，发现无线电观测的速率与我们的值相符，误差在±2σ以内。我们还比较了2008年幽灵般的产水率和1997年幽灵般的其他结果。我们发现，2008年的水生产率与1997年的水生产率一致。最近几十年来，彗星46P在其近日点通行证附近的水生产率没有长期变化。

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