Presented here are the details of the astrometric reductions from the x,y data to mean Right Ascension (RA), Declination (Dec) coordinates of the third U.S. Naval Observatory (USNO) CCD Astrograph Catalog (UCAC3). For these new reductions we used over 216,000 CCD exposures. The Two-Micron All-Sky Survey (2MASS) data are extensively used to probe for coordinate and coma-like systematic errors in UCAC data mainly caused by the poor charge transfer efficiency (CTE) of the 4K CCD. Errors up to about 200 mas have been corrected using complex look-up tables handling multiple dependencies derived from the residuals. Similarly, field distortions and sub-pixel phase errors have also been evaluated using the residuals with respect to 2MASS. The overall magnitude equation is derived from UCAC calibration field observations alone, independent of external catalogs. Systematic errors of positions at UCAC observing epoch as presented in UCAC3 are better corrected than in the previous catalogs for most stars. The Tycho-2 catalog is used to obtain final positions on the International Celestial Reference Frame (ICRF). Residuals of the Tycho-2 reference stars show a small magnitude equation (depending on declination zone) that might be inherent in the Tycho-2 catalog.
Astrometric positions for 18 irregular satellites of giant planets from 23 years of observations
巨行星的不规则卫星被认为是在太阳系演化过程中被捕获的。了解它们的物理参数,如大小、密度和密度,对于限制它们来自何处以及如何捕获它们非常重要。获得这些参数的最佳方法是由航天器进行现场观测或由天体进行掩星观测。这两种技术都要求轨道是已知的。我们的目标是获得良好的天体测量位置的不规则卫星,以改善他们的轨道和星历。我们从三个数据库中识别并减少了几颗不规则卫星的观测结果,这些数据库包含1992年至2014年在三个站点(Observatório do Pico dos Dias,Observatoire de Haute-Provence和European Southern Observatory - La Silla)获得的8000多张图像。我们使用PRAIA(Platform for Reduction of Astronomical Images Automatically)软件对CCD图像进行了天体测量归算。UCAC 4星表代表国际天体参考系。帧中卫星的识别是通过SPICE/NAIF内核确定的星历完成的。为了克服信息(坐标、日期)缺失或不完整的问题,采取了一些程序,主要是针对较旧的图像。我们设法获得了18颗不规则卫星的6000多个位置:木星的12个,土星的4个,天王星的1个(Sycorax)和海王星的1个(Nereid)。对于某些卫星,获得的位置数超过早期轨道数值积分中使用的位置数的5…
The Roman Coronagraph Community Participation Program: data reduction pipeline astrometric calibration
Northwestern University(西北大学);Center for Interdisciplinary Exploration and Research in Astrophysics(天体物理跨学科探索与研究中心);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);University of California Santa Barbara(加州大学圣塔芭芭拉分校);Space Telescope Science Institute(太空望远镜科学研究所)
KMTNet Synoptic Survey of Southern Sky II: Data Reduction and Real-Time Transient Detection Pipeline
Seoul National University(首尔大学);Daegu National Science Museum(大邱国立科学博物馆);Korea Astronomy and Space Science Institute(韩国天文学与空间科学研究院);University of Hawaii(夏威夷大学)
本文介绍KMTNet南天全景巡天数据释放1的图像处理流水线,涵盖数据质量保证、天体测量、光度零点校准等核心方法,实现亚像素精度的天体测量和22-23 AB mag的5西格玛深度。
Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes
我们研究天体测量残差的同时适合超Suprime-Cam图像。我们的目标是表征这些残差,并研究在何种程度上,他们占主导地位的大气贡献亮源。我们使用高斯过程插值,与一个关联函数(核),从数据测量,平滑和校正观测到的天体测量残差场。我们发现,高斯过程插值与冯卡门内核允许我们减少约一个数量级的协方差的天体测量残差附近的来源,从30 mas $^2$到3 mas $^2$在角尺度为~1弧分,和减半的均方根。残差使用高斯过程插值的这些减少与最近发表的暗能量调查数据集的结果相似。然后,我们能够检测到小的静态天体测量残差,由于超Suprime-Cam传感器的影响。我们讨论了如何高斯过程插值的天体测量残差影响星系形状的测量,特别是在宇宙剪切分析的背景下,鲁宾天文台遗产调查的空间和时间。
Stellar Density Classification and Regression for CSST Multi-color Imaging Using Deep Learning
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学天文与前沿科学研究院);School of Physics and Astronomy, China West Normal University(西华师范大学物理与天文学学院)
PhoPS: An automated photometric pipeline for survey-era astronomy
Türkiye National Observatories, TUG(土耳其国家天文台);The Scientific and Technological Research Council of Türkiye (TÜBİTAK)(土耳其科学技术研究委员会);Instituto de Astrofísica de Andalucía (IAA-CSIC)(安达卢西亚天体物理研究所);LIRA, CNRS UMR8254, Observatoire de Paris(巴黎天文台)
Antarctic TianMu Staring Observation Project II: Data reduction and preliminary results
Xinjiang Astronomical Observatory, Chinese Academy of Sciences(中国科学院新疆天文台);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)
Orbits for eighteen visual binaries and two double-line spectroscopic binaries observed with HRCAM on the CTIO SOAR 4m telescope, using a new Bayesian orbit code based on Markov Chain Monte Carlo
GPUPHOT: A Python Framework for High-Performance GPU-Accelerated Photometry and Distributed Astronomical Data Reduction
Light Bridges S.L.;Universidad de La Laguna (ULL)(拉帕尔马大学);Instituto Tecnológico y de Energías Renovables (ITER)(技术与可再生能源研究所);Instituto de Astrofísica de Canarias (IAC)(加那利天体物理研究所)