Water Production Rate of the Jupiter-Family Comet 46P/Wirtanen in the 2008 Apparition with the Subaru Telescope/IRCS
Water Production Rate of the Jupiter-Family Comet 46P/Wirtanen in the 2008 Apparition with the Subaru Telescope/IRCS
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DOI：
10.1093/pasj/62.4.1025
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发表时间：
2010-08
影响因子：
2.3
通讯作者：
H. Kobayashi;H. Kawakita
中科院分区：
文献类型：
--
作者：
H. Kobayashi;H. Kawakita
我们展示了2008年彗星46P/Wirtanen的产水率，这是由高色散近红外光谱观测确定的。46P/Wirtanen彗星是木星家族的一颗彗星，过去是罗塞塔号任务的目标。对46P彗星的观测是在2008年2月中旬用斯巴鲁望远镜和红外相机光谱仪（IRCS）仪器进行的。我们在2008年2月19日彗星近日点通道附近探测到三条水发射线，并确定了水的产率为（1.7˙0.2）−1028分子s−1。这是第一次在彗星46P的彗发中直接探测到水。我们将我们的结果与同一次观测中近日点通道附近的射电观测确定的产水率进行了比较，发现射电观测的产水率与我们的值在˙2°误差范围内是一致的。我们还将2008年观测到的产水量与1997年观测到的其他结果进行了比较。研究发现，2008年的出水量与1997年基本一致。近几十年来，46P彗星在近日点附近的产水率没有长期变化。
We present the water production rate of 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) � 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 ˙ 2 � 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.