Astronomy and Computing最新文献_第8页

The effect of baseline on the uncertainties of range determination performed by two-site astrometric observations 基线对双站点天体测量观测所进行的测距不确定性的影响：三角测量法的样本案例：土耳其卫星 3A 和土耳其卫星 4A

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2024-01-01 DOI: 10.1016/j.ascom.2024.100787

H.G. Gökay , S. Özdemi̇r , M.N. Bağıran , S. Aydın

{"title":"The effect of baseline on the uncertainties of range determination performed by two-site astrometric observations","authors":"H.G. Gökay , S. Özdemi̇r , M.N. Bağıran , S. Aydın","doi":"10.1016/j.ascom.2024.100787","DOIUrl":"10.1016/j.ascom.2024.100787","url":null,"abstract":"<div><p>The uncertainties in range determination depending on two-site locations for GEO satellites were calculated and shown that the uncertainty in the range depends not only on linear baseline distance between the locations but also both latitude and longitude of geographic coordinates of the sites. By taking the first observing site as fixed and changing the location of the second site, the triangulated range calculations were performed by using SGP4 orbital model and published Two-Line Elements (TLE). Additionally, as a sample of triangulated observation, the results of nearly synchronous two-site astrometric measurements of two GEO satellites, TURKSAT 3A and TURKSAT 4A, were presented. These astrometric observations were carried out in TÜBITAK National Observatory (TUG), Antalya and TURKSAT Company’s site, Ankara. Although the baseline between the observatory sites corresponds to a relatively short distance of about 400 km, measured range determinations well stays under the error level expected by Choi et al. (2010).</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133724000027/pdfft?md5=6cfd1d122d56dbdf2ffa095e9b9f5360&pid=1-s2.0-S2213133724000027-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The HERMES calibration pipeline: mescal HERMES 标定流水线：梅斯卡尔

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2024-01-01 DOI: 10.1016/j.ascom.2024.100797

G. Dilillo , E.J. Marchesini , G. Della Casa , G. Baroni , R. Campana , E. Borciani , S. Srivastava , S. Trevisan , F. Ceraudo , M. Citossi , Y. Evangelista , A. Guzmán , P. Hedderman , C. Labanti , E. Virgilli , F. Fiore

{"title":"The HERMES calibration pipeline: mescal","authors":"G. Dilillo , E.J. Marchesini , G. Della Casa , G. Baroni , R. Campana , E. Borciani , S. Srivastava , S. Trevisan , F. Ceraudo , M. Citossi , Y. Evangelista , A. Guzmán , P. Hedderman , C. Labanti , E. Virgilli , F. Fiore","doi":"10.1016/j.ascom.2024.100797","DOIUrl":"10.1016/j.ascom.2024.100797","url":null,"abstract":"<div><p>The HERMES Technologic and Scientific Pathfinder project is a constellation of six CubeSats aiming to observe transient high-energy events such as the Gamma Ray Bursts (GRBs). HERMES will be the first space telescope to include a <em>siswich</em> detector, able to perform spectroscopy in the 2 keV to 2 MeV energy band. The particular siswich architecture, which combines a solid-state Silicon Drift Detector and a scintillator crystal, requires specific calibration procedures that have not been yet standardized in a pipeline. We present in this paper the HERMES calibration pipeline, <span>mescal</span>, intended for raw HERMES data energy calibration and formatting. The software is designed to deal with the particularities of the siswich architecture and to minimize user interaction, including also an automated calibration line identification procedure, and an independent calibration of each detector pixel, in its two different operating modes. The <span>mescal</span> pipeline can set the basis for similar applications in future siswich telescopes.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S221313372400012X/pdfft?md5=f0527f7cc0e2a4311fcea397ff5032af&pid=1-s2.0-S221313372400012X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139657925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Harnessing edge-enhanced attention mechanisms for supernova detection in deep learning frameworks 在深度学习框架中利用边缘增强注意力机制进行超新星检测

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-16 DOI: 10.1016/j.ascom.2023.100784

K. Yin , J. Jia , F. Li , X. Gao , T. Sun

{"title":"Harnessing edge-enhanced attention mechanisms for supernova detection in deep learning frameworks","authors":"K. Yin , J. Jia , F. Li , X. Gao , T. Sun","doi":"10.1016/j.ascom.2023.100784","DOIUrl":"10.1016/j.ascom.2023.100784","url":null,"abstract":"<div><p>Recent studies have shown the advantages of convolutional neural networks in the classification and detection of supernovae. In our prior work, we employed one-stage object detection frameworks to address the challenges of presupposed location and varying image sizes in supernova detection. Notably, the backbone of the object detectors naturally emphasized the edges of candidate regions in the visualized heatmap, reflecting the strategies adopted by human observers. Capitalizing on this similarity, we introduce an innovative edge attention module, tailored to prioritize the edges of candidate regions, and improved the performance of supernova detectors. In parallel, we have developed a three-channel supernova detection dataset by integrating science (current), template (reference), and difference images into a three-channel configuration. The candidates in the new dataset are more conspicuous. To assess the efficacy of our edge attention module, we conducted a series of experiments on the proposed dataset. The experimental results establish the superiority of the proposed method in detecting supernovae. Additionally, visualizations of the feature maps shows the proposed edge attention is able to reallocate weights around the candidate edges, corroborating its effectiveness.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133723000999/pdfft?md5=ac31d2323a16f279ff700e51a1002074&pid=1-s2.0-S2213133723000999-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The study of equilibrium dynamics of the collinear restricted four-body problem with non-spherical test particle 带非球形测试粒子的共线受限四体问题的平衡动力学研究

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-14 DOI: 10.1016/j.ascom.2023.100781

M.C. Asique , S. Alhowaity , A. Alhowaity , H. Hamam , M.S. Suraj

引用次数: 0

Data-driven satellite orbit prediction using two-line elements 利用双线元进行数据驱动的卫星轨道预测

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-06 DOI: 10.1016/j.ascom.2023.100782

M. Thammawichai , T. Luangwilai

引用次数: 0

Unveiling the intricacies of attracting zones in magnetic binary systems: Investigating the impact of Yukawa correction 揭示磁性双星系统吸引区的复杂性：研究汤川修正的影响

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-06 DOI: 10.1016/j.ascom.2023.100783

V. Kumar , R. Aggarwal , S.K. Marig

{"title":"Unveiling the intricacies of attracting zones in magnetic binary systems: Investigating the impact of Yukawa correction","authors":"V. Kumar , R. Aggarwal , S.K. Marig","doi":"10.1016/j.ascom.2023.100783","DOIUrl":"10.1016/j.ascom.2023.100783","url":null,"abstract":"<div><p>This study delves into the restricted three-body problem with a Yukawa correction to Newtonian gravitational forces, focusing on magnetic binary systems. We scrutinize the influence of Yukawa correction parameters (<span><math><mi>α</mi></math></span>, <span><math><mi>β</mi></math></span>) and the ratio of magnitude of magnetic moments (<span><math><mi>λ</mi></math></span>) on the system’s equilibrium points and their stability, zero-velocity curves. In our case, there exist of five and seven equilibrium points and all are found to be unstable for given range of parameters. Our examination extends to the basins of convergence and the existence of fractal under the influence of <span><math><mi>α</mi></math></span> and <span><math><mi>λ</mi></math></span>. Graphs drawn with the help of Wolfram Mathematica software vividly portray the parameter-driven evolution of equilibrium points, zero-velocity curves and basins of convergence. Furthermore, we explore the fractal characteristics within the basins of convergence, offering valuable insights into the complex dynamics of magnetic binary systems with Yukawa correction.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133723000987/pdfft?md5=432a393f33b3363114c4d02baa2369ce&pid=1-s2.0-S2213133723000987-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulating skylight polarization patterns using the backward Markov Chain Monte Carlo method 使用后向马尔可夫链蒙特卡洛法模拟天窗偏振模式

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-05 DOI: 10.1016/j.ascom.2023.100772

Shuai Li , Rui Wang , Jiuming Cheng , Congming Dai , Wenqing Xu , Heli Wei , Jie Zhan

{"title":"Simulating skylight polarization patterns using the backward Markov Chain Monte Carlo method","authors":"Shuai Li , Rui Wang , Jiuming Cheng , Congming Dai , Wenqing Xu , Heli Wei , Jie Zhan","doi":"10.1016/j.ascom.2023.100772","DOIUrl":"https://doi.org/10.1016/j.ascom.2023.100772","url":null,"abstract":"<div><p>Skylight polarization patterns provide valuable information for atmospheric measurements, polarized remote sensing and navigation applications. However, efficiently and accurately modeling polarized radiative transfer in atmospheric scattering remains challenging. We propose a backward Markov chain Monte Carlo (B-MCMC) method to simulate skylight polarization patterns by constructing a Markov chain in parameter space to track photons from the sensor to the top-of-atmosphere (TOA). The results show that the B-MCMC model significantly improves the computational efficiency by a factor of 8-10 while retaining the computational accuracy compared with Monte Carlo simulations. The experiments show that in cloudy skies, the skylight polarization pattern is generally weakened, in the field of skylight polarization detection and application, long wavelengths should be used in clear weather and blue-violet light should be used in cloudy weather, which corresponds to a larger degree of polarization (DOP) and facilitates the acquisition of polarization information. Finally, the aerosol optical depth (AOD) has an important effect on the skylight polarization, as the AOD increases, the DOP decreases, and the decreasing trend will be more and more obvious, when the AOD is above 0.3, the maximum DOP will not exceed 0.5, which is verified by the division of focal plane (DOFP) polarization measurement device.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133723000872/pdfft?md5=722079f83e13c81952732f08bc36cb4a&pid=1-s2.0-S2213133723000872-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138489727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OPTICAM triple-channel astronomical image acquisition control software and external triggering synchronization system OPTICAM 三通道天文图像采集控制软件和外部触发同步系统

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-12-01 DOI: 10.1016/j.ascom.2023.100773

A. Castro , I. Zavala , E. Colorado , J. Herrera , N. Castro Segura , R. Michel , D. Altamirano , L. Altamirano-Dévora , G. Sierra , J. Echevarría , J. Hernández-Landa

{"title":"OPTICAM triple-channel astronomical image acquisition control software and external triggering synchronization system","authors":"A. Castro , I. Zavala , E. Colorado , J. Herrera , N. Castro Segura , R. Michel , D. Altamirano , L. Altamirano-Dévora , G. Sierra , J. Echevarría , J. Hernández-Landa","doi":"10.1016/j.ascom.2023.100773","DOIUrl":"https://doi.org/10.1016/j.ascom.2023.100773","url":null,"abstract":"<div><p>We present the development of software to control the multichannel image acquisition process and the design of an external timing module (ETM) for the OPTICAM system (Castro et al., 2019). The ETM is used to generate high-speed synchronized pulses for OPTICAM’s three different sCMOS cameras and is based on an ESP32-S2 micro-controller. The graphical user interface (GUI) of this instrument is also described, which allows users to enter the configuration parameters of the observations and execute actions such as starting and stopping image acquisition sequences or initializing cameras. 3 mini PCs are in charge of reading each one of the cameras, respectively. The software and hardware tools presented here have been successfully implemented at the Observatorio Astronómico Nacional (OAN-SPM), Mexico. By analyzing the recorded image sequences, it is possible to perform high-precision multi-channel photometric measurements of astrophysical objects that exhibit high temporal variability, revealing information about periodicities, inter-band delays, and quasi-periodic oscillations.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133723000884/pdfft?md5=579a8b6e602a63c2c244ab4f58d63c7a&pid=1-s2.0-S2213133723000884-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138489728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Search for the edge-on galaxies using an artificial neural network 使用人工神经网络搜索边缘星系

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-11-30 DOI: 10.1016/j.ascom.2023.100771

S.S. Savchenko , D.I. Makarov , A.V. Antipova , I.S. Tikhonenko

引用次数: 0

Spiral-Elliptical automated galaxy morphology classification from telescope images 基于望远镜图像的螺旋椭圆星系形态自动分类

IF 2.5 4区物理与天体物理

Astronomy and Computing Pub Date : 2023-11-23 DOI: 10.1016/j.ascom.2023.100770

M.J. Baumstark, G. Vinci

{"title":"Spiral-Elliptical automated galaxy morphology classification from telescope images","authors":"M.J. Baumstark, G. Vinci","doi":"10.1016/j.ascom.2023.100770","DOIUrl":"https://doi.org/10.1016/j.ascom.2023.100770","url":null,"abstract":"<div><p>The classification of galaxy morphologies is an important step in the investigation of theories of hierarchical structure formation. While human expert visual classification remains quite effective and accurate, it cannot keep up with the massive influx of data from emerging sky surveys. A variety of approaches have been proposed to classify large numbers of galaxies; these approaches include crowdsourced visual classification, and automated and computational methods, such as machine learning methods based on designed morphology statistics and deep learning. In this work, we develop two novel galaxy morphology statistics, descent average and descent variance, which can be efficiently extracted from telescope galaxy images. We further propose simplified versions of the existing image statistics concentration, asymmetry, and clumpiness, which have been widely used in the literature of galaxy morphologies. We utilize the galaxy image data from the Sloan Digital Sky Survey to demonstrate the effective performance of our proposed image statistics at accurately detecting spiral and elliptical galaxies when used as features of a random forest classifier.</p></div>","PeriodicalId":48757,"journal":{"name":"Astronomy and Computing","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213133723000859/pdfft?md5=efb44e4a33cafdd5ab52dbae6bd64201&pid=1-s2.0-S2213133723000859-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138439652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0