Site Testing of the Sierra de Javalambre: First Results
Site Testing of the Sierra de Javalambre: First Results
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DOI：
10.1086/651084
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发表时间：
2009-12
影响因子：
3.5
通讯作者：
M. Molés;S. Sánchez;J. L. Lamadrid;A. Cenarro;D. Cristóbal-Hornillos;N. Maícas;J. Aceituno
中科院分区：
文献类型：
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作者：
M. Molés;S. Sánchez;J. L. Lamadrid;A. Cenarro;D. Cristóbal-Hornillos;N. Maícas;J. Aceituno
我们介绍了设在雅瓦兰布雷山脉的Pico del Buitre的主要特点，这是雅瓦兰布雷天体物理天文台的拟议选址。这些测量值是通过现场不同的监视器和仪器获得的分光光度、光度和SEE数据获得的。我们还使用了可公开获取的气象卫星数据来确定可用于观测的总时间。在无月之夜观测到的夜空光谱显示，典型的污染线几乎没有污染。它们对天空亮度的贡献分别是B区的∼0.06毫克，V区的∼0.09毫克，R区的∼0.06毫克。特别是，钠人工谱线和天然谱线的强度比较表明，该地点符合国际天文学联合会关于暗点的建议。无月夜空表面亮度的天顶校正值为B=22.8，V=22.1，R=21.5，I=20.4，表明该地点很暗。对夏季的消光进行了测量，在V波段的典型值为0.22毫克，在一个完全光度测量的夜晚，最佳的测量值为0.18毫克。近两年(2008-2009年)V波段视宁度的中位数为0.71“，模式为0.58”。视宁值呈季节性变化，夏季(∼0.69“)小于冬季(∼0.77”)。在分析的夜晚中，有68%的人整晚的视力都好于0.8英寸。视力在相当长的一段时间内是稳定的，特别是在视力值较好的夜晚。对于视度低于0.8“的夜晚，典型的比例尺约为5小时，变化范围在参考值的20%以内。完全晴朗的夜晚的比例为∼53%，而夜间至少30%的夜间晴朗的比例为∼74%。
We present the main characteristics of the Pico del Buitre, at the Sierra de Javalambre, the proposed location for the Javalambre Astrophysical Observatory. The measurements have been obtained from spectrophotometric, photometric, and seeing data obtained with different monitors and instruments on the site. We have also used publicly-accessible meteorological satellite data to determine the total time useful for observations. The night-sky optical spectrum observed in a moonless night shows very little contamination by the typical pollution lines. Their contribution to the sky brightness is ∼0.06 mag in B, ∼0.09 mag in V, and ∼0.06 mag in R. In particular, the comparison of the strengths of the sodium artificial and natural lines indicates that the site satisfies the IAU recommendations for a dark site. The zenith-corrected values of the moonless night-sky surface brightness are B = 22.8 mag arcsec-2, V = 22.1 mag arcsec-2, R = 21.5 mag arcsec-2, I = 20.4 mag arcsec-2, which indicates that the site is very dark. The extinction has been measured for the summer period, with a typical value of 0.22 mag in the V -Band, with the best measured value of 0.18 mag in a totally photometric night. The median value of the seeing in the V -band for the last 2 yr (2008–2009) is 0.71″, with a mode of 0.58″. The seeing values present a seasonal pattern, being smaller in summer (∼0.69″) than in winter (∼0.77″). For 68% of the analyzed nights, the seeing was better than 0.8″ during the entire night. The seeing is found to be stable for rather long periods, in particular for the nights with good seeing values. The typical scale, for nights with the seeing below 0.8″, is about 5 hr for variations within 20% of the reference value. The fraction of totally clear nights is ∼53%, while the fraction of nights with at least 30% of the night clear is ∼74%.