SIMULTANEOUS PHOTOMETRIC AND POLARIMETRIC OBSERVATIONS OF ASTEROID 3 JUNO
SIMULTANEOUS PHOTOMETRIC AND POLARIMETRIC OBSERVATIONS OF ASTEROID 3 JUNO
复制标题
小行星 3 JUNO 的同步光度和偏振观测
DOI：
10.1088/0004-6256/138/3/951
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Kawabata
中科院分区：
文献类型：
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作者：
S. Takahashi;F. Yoshida;K. Shinokawa;T. Mukai;K. Kawabata
2000年8月4日至8日，冈山天体物理天文台使用低分辨率分光偏振仪HBS对小行星3 Juno进行了同时测光和偏振观测。光变曲线的振幅为0.14等，具有几乎相同的亮度最大值和0.10等不同的最小值。偏振数据显示出偏振度绝对值的一个极大值和一个极小值|PR|在V波段，差异达到0.149%。的最小值|PR|出现在光变曲线的第二个最小值附近，这意味着朱诺3号表面存在明亮区域。我们发现，|PR|随着波长的增加，其辐射强度有增加0.1%-0.2%的趋势，这一结果与S-型小行星的一般趋势相一致。此外，我们可能会发现，|PR|在波长超过7000埃时更陡。根据偏振度随朱诺3号自转的变化，我们用一个简单的模型估算了亮区的偏振度，得到了0.19 - 0.41的范围。
Simultaneous photometric and polarimetric observations of asteroid 3 Juno have been carried out with a low-resolution spectropolarimeter HBS at Okayama Astrophysical Observatory from 2000 August 4 to 8. The amplitude of the light curve was 0.14 mag with almost the same brightness maxima and 0.10 mag different minima. Polarimetric data showed one maximum and minimum in the absolute values of polarization degree |Pr|, and the difference attained 0.149% in the V band. The minimum of |Pr| appeared around the second minimum of the light curve, which means that a bright area exists on the surface of 3 Juno. We found that the values of |Pr| tend to increase 0.1%–0.2% with wavelength, and this result is consistent with the general tendency of S-type asteroids. In addition, we might find that the increase rate of |Pr| is steeper in wavelengths longer than 7000 Å. From the variation of polarization degree with the rotation of 3 Juno, we estimated the albedo of the bright area with a simple model and obtained a range of 0.19–0.41.