Deep Near-Infrared Survey of the Southern Sky (DENIS) Catalog

This data release, from 2005 September, consists of 355,220,325 point sources detected by DENIS. The release contains 3662 strips, each of which is 30 degrees long in Declination and 12 arcmin wide in Right Ascension (with an overlap of 2 arcminutes between consecutive strips), and covers approximately 16,700 square degrees of the southern sky. The northernmost declination covered is ~+02d07m and the southernmost is ~-87d37m. Multiple detections of single point sources have been merged in image overlaps within individual strips, but sources can have multiple detections in overlapping strips. DENIS observations began at the end of 1995 and were completed on 09 September 2001. The survey was conducted simultaneously in three bands: one optical band (Gunn-i at 0.82um, hereafter referred to as "I") and two near-infrared bands (J at 1.25um and Ks at 2.15um), with limiting magnitudes of 18.5 mag, 16.5 mag, and 14.0 mag and saturation magnitudes of 9.8 mag, 7.5 mag, and 6 mag at I, J, and Ks, respectively. Documentation at CDS states that the astrometric accuracy of a typical point source is better than 1 arcsec and photometric accuracy is better than 0.1 mag, although the range of SNR over which these apply is not specified. DENIS was conducted by a European consortium using the 1m telescope at the European Southern Observatory in La Silla, Chile. This dataset or service is made available by the Infrared Science Archive (IRSA) at IPAC, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration.

本数据集发布于2005年9月，共包含由DENIS探测到的355,220,325个点源。本次发布共包含3662个条带，每个条带在赤纬方向长度为30度，赤经方向宽度为12角分，相邻条带间存在2角分的重叠区域，覆盖南天约16,700平方度的天区。其覆盖的赤纬范围最北约为+02°07′，最南约为-87°37′。单个点源在单一条带内的多次探测结果已在图像重叠区域完成合并，但不同条带的重叠区域中，同一源仍可能存在多次探测记录。DENIS巡天观测始于1995年末，于2001年9月9日完成。本次巡天同时在三个波段开展观测：一个光学波段（0.82μm的甘姆i（Gunn-i）波段，下文简称“I波段”）以及两个近红外波段（1.25μm的J波段与2.15μm的Ks波段）；I、J、Ks波段的极限星等分别为18.5星等、16.5星等与14.0星等，饱和星等分别为9.8星等、7.5星等与6.0星等。欧洲斯特拉斯堡天文数据中心（Centre de Données astronomiques de Strasbourg, CDS）的文档显示，典型点源的天体测量精度优于1角秒，测光精度优于0.1星等，但未明确适用的信噪比（Signal-to-Noise Ratio, SNR）范围。DENIS巡天由欧洲合作团队利用位于智利拉西拉的欧洲南方天文台1米口径望远镜完成。本数据集或服务由IPAC下属的红外科学档案馆（Infrared Science Archive, IRSA）提供，IPAC由加州理工学院与美国国家航空航天局（National Aeronautics and Space Administration, NASA）签订合同运营。