Journal of Astronomy and Space Sciences最新文献

Structural Design of Planar Synthetic Aperture Radar (SAR) Antenna for Microsatellites 微型卫星平面合成孔径雷达（SAR）天线的结构设计

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.225

Dong-Guk Kim, Sung-Woo Park, Jong-Pil Kim, Hwa-Young Jung, Yura Lee, Eung-Noh You, Hee Keun Cho, Jin Hyo An, Goo-Hwan Shin

引用次数: 0

Search for Dark Photon in e+e− → A′A′ Using Future Collider Experiments 利用未来对撞机实验搜索 e+e- → A′A′ 中的暗光子

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.259

Kihong Park, Kyungho Kim, Alexei Sytov, K. Cho

{"title":"Search for Dark Photon in e+e− → A′A′ Using Future Collider Experiments","authors":"Kihong Park, Kyungho Kim, Alexei Sytov, K. Cho","doi":"10.5140/jass.2023.40.4.259","DOIUrl":"https://doi.org/10.5140/jass.2023.40.4.259","url":null,"abstract":"The Standard Model (SM) does not provide an information for 26% of dark matter of the universe. In the dark sector, dark matter is supposed to be linked with the hypothetical particles called dark photons that have similar role to photons in electromagnetic interaction in the SM. Besides astronomical observation, there are studies to find dark matter candidates using accelerators. In this paper, we searched for dark photons using future electron-positron colliders, including Circular Electron Positron Collider (CEPC)/CEPC, Future Circular Collider (FCC-ee)/Innovative Detector for Electron-positron Accelerator (IDEA), and International Linear Collider (ILC)/International Large Detector (ILD). Using the parameterized response of the detector simulation of Delphes, we studied the sensitivity of a double dark photon mode at each accelerator/detector. The signal mode is double dark photon decay channel, e+e− → A’A’, where A’ (dark photon with spin 1) decaying into a muon pair. We used MadGraph5 to generate Monte Carlo (MC) events by means of a Simplified Model. We found the dark photon mass at which the cross-sections were the highest for each accelerator to obtain the maximum number of events. In this paper we show the expected number of dark photon signal events and the detector efficiency of each accelerator. The results of this study can facilitate in the dark photon search by future electron-positron accelerators.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139189357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preliminary Characterization of Secondary Illumination at Shackleton Crater Permanently Shadowed Region from ShadowCam Observations and Modeling 通过 ShadowCam 观测和建模初步确定沙克尔顿陨石坑永久阴影区的二次照明特征

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.131

P. Mahanti, M. S. Robinson, D. Humm, R. Wagner, Nick Estes, Jean-Pierre Williams

引用次数: 0

ShadowCam Instrument and Investigation Overview ShadowCam 仪器和调查概述

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.149

M. S. Robinson, S. Brylow, M. Caplinger, Lynn M. Carter, Mattew John Clark, B. Denevi, Nick Estes, D. Humm, P. Mahanti, Douglas Arden Peckham, M. Ravine, Jacob Andrieu Schaffner, E. Speyerer, R. Wagner

引用次数: 0

Korea Pathfinder Lunar Orbiter Magnetometer Instrument and Initial Data Processing 韩国探路者月球轨道器磁强计仪器和初始数据处理

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.199

Wooin Jo, Ho Jin, Hye-Ock Park, Yunho Jang, Seongwhan Lee, Khan-Hyuk Kim, I. Garrick‐Bethell, Jehyuck Shin, S. Baek, Junhyun Lee, Derac Son, Eunhyeuk Kim

{"title":"Korea Pathfinder Lunar Orbiter Magnetometer Instrument and Initial Data Processing","authors":"Wooin Jo, Ho Jin, Hye-Ock Park, Yunho Jang, Seongwhan Lee, Khan-Hyuk Kim, I. Garrick‐Bethell, Jehyuck Shin, S. Baek, Junhyun Lee, Derac Son, Eunhyeuk Kim","doi":"10.5140/jass.2023.40.4.199","DOIUrl":"https://doi.org/10.5140/jass.2023.40.4.199","url":null,"abstract":"The Korea Pathfinder Lunar Orbiter (KPLO), the first South Korea lunar exploration probe, successfully arrived at the Moon on December, 2022 (UTC), following a 4.5-month ballistic lunar transfer (BLT) trajectory. Since the launch (4 August, 2022), the KPLO magnetometer (KMAG) has carried out various observations during the trans-lunar cruise phase and a 100 km altitude lunar polar orbit. KMAG consists of three fluxgate magnetometers capable of measuring magnetic fields within a ± 1,000 nT range with a resolution of 0.2 nT. The sampling rate is 10 Hz. During the originally planned lifetime of one year, KMAG has been operating successfully while performing observations of lunar crustal magnetic fields, magnetic fields induced in the lunar interior, and various solar wind events. The calibration and offset processes were performed during the TLC phase. In addition, reliabilities of the KMAG lunar magnetic field observations have been verified by comparing them with the surface vector mapping (SVM) data. If the KPLO’s mission orbit during the extended mission phase is close enough to the lunar surface, KMAG will contribute to updating the lunar surface magnetic field map and will provide insights into the lunar interior structure and lunar space environment.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139194872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calibration of ShadowCam 校准 ShadowCam

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.173

D. Humm, M. Kinczyk, S. Brylow, R. Wagner, E. Speyerer, Nick Estes, P. Mahanti, Aaron Kyle Boyd, M. S. Robinson

{"title":"Calibration of ShadowCam","authors":"D. Humm, M. Kinczyk, S. Brylow, R. Wagner, E. Speyerer, Nick Estes, P. Mahanti, Aaron Kyle Boyd, M. S. Robinson","doi":"10.5140/jass.2023.40.4.173","DOIUrl":"https://doi.org/10.5140/jass.2023.40.4.173","url":null,"abstract":"ShadowCam is a high-sensitivity, high-resolution imager provided by NASA for the Danuri (KPLO) lunar mission. ShadowCam calibration shows that it is well suited for its purpose, to image permanently shadowed regions (PSRs) that occur near the lunar poles. It is 205 times as sensitive as the Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC). The signal to noise ratio (SNR) is greater than 100 over a large part of the dynamic range, and the top of the dynamic range is high enough to accommodate most brighter PSR pixels. The optical performance is good enough to take full advantage of the 1.7 meter/pixel image scale, and calibrated images have uniform response. We describe some instrument artifacts that are amenable to future corrections, making it possible to improve performance further. Stray light control is very challenging for this mission. In many cases, ShadowCam can image shadowed areas with directly illuminated terrain in or near the field of view (FOV). We include thorough qualitative descriptions of circumstances under which lunar brightness levels far higher than the top of the dynamic range cause detector or stray light artifacts and the size and extent of the artifact signal under those circumstances.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Contingency Trajectory Operation for the Korea Pathfinder Lunar Orbiter 准备韩国探路者月球轨道器的应急轨迹操作

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.217

Jun Bang, Seung-Su Hong, Jonghee Bae, Young-Joo Song, Donghun Lee

引用次数: 0

Analysis of Tip/Tilt Compensation of Beam Wandering for Space Laser Communication 空间激光通信光束漂移的尖端/倾斜补偿分析

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.237

Seok-Min Song, Hyung-Chul Lim, Mansoo Choi, Yu Yi

{"title":"Analysis of Tip/Tilt Compensation of Beam Wandering for Space Laser Communication","authors":"Seok-Min Song, Hyung-Chul Lim, Mansoo Choi, Yu Yi","doi":"10.5140/jass.2023.40.4.237","DOIUrl":"https://doi.org/10.5140/jass.2023.40.4.237","url":null,"abstract":"Laser communication has been considered as a novel method for earth observation satellites with generation of high data volume. It offers faster data transmission speeds compared to conventional radio frequency (RF) communication due to the short wavelength and narrow beam divergence. However, laser beams are refracted due to atmospheric turbulence between the ground and the satellite. Refracted laser beams, upon reaching the receiver, result in angle-of-arrival (AoA) fluctuation, inducing image dancing and wavefront distortion. These phenomena hinder signal acquisition and lead to signal loss in the course of laser communication. So, precise alignment between the transmitter and receiver is essential to guarantee effective and reliable laser communication, which is achieved by pointing, acquisition, and tracking (PAT) system. In this study, we simulate the effectiveness of tip/tilt compensation for more efficient laser communication in the satellite-ground downlink. By compensating for low-order terms using tip/tilt mirror, we verify the alleviation of AoA fluctuations under both weak and strong atmospheric turbulence conditions. And the performance of tip/tilt correction is analyzed in terms of the AoA fluctuation and collected power on the detector.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Radiation Pressure Formed at the Inner Region of the Accretion Disk on the Accretion Flow in the Outer Region 吸积盘内部区域形成的辐射压力对外部区域吸积流的影响

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-12-01 DOI: 10.5140/jass.2023.40.4.247

Hongsu Kim, Uicheol Jang

引用次数: 0

Studying the Ephemeris Effect on Position Accuracy Based on Criteria Applied to Baseline Lengths by New MATLAB Program (NMP) 基于基线长度准则的星历对定位精度的影响

Journal of Astronomy and Space Sciences Pub Date : 2023-09-01 DOI: 10.5140/jass.2023.40.3.113

Shimaa Farouk, Mahmoud El-Nokrashy, Ahmed Abd-Elhay, Nasr Saba

{"title":"Studying the Ephemeris Effect on Position Accuracy Based on Criteria Applied to Baseline Lengths by New MATLAB Program (NMP)","authors":"Shimaa Farouk, Mahmoud El-Nokrashy, Ahmed Abd-Elhay, Nasr Saba","doi":"10.5140/jass.2023.40.3.113","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.113","url":null,"abstract":"Although the Relative Global Navigation Satellite System (GNSS) positioning technique provides high accuracy, it has several drawbacks. The scarcity of control points, the long baselines, and using of ultra-rabid and rabid products increased position errors. This study has designed a New MATLAB Program that helps users automatically select suitable IGS stations related to the baseline lengths and the azimuth between GNSS points and IGS stations. This study presented criteria for the length of the baselines used in Egypt and an advanced estimated accuracy before starting the project. The experimental test studies the performance of the position accuracy related to the relation between three factors: observation session, final, rabid, and ultra-rabid products, and the baseline lengths. Ground control point mediates Egypt was selected as a test point. Nine surrounding IGS stations were selected as reference stations, and the coordinates of the tested point were calculated based on them. Baselines between the tested point and the IGS stations were classified regarding proposal criteria. The coordinates of the tested point were obtained in different observation sessions (0.5, 1, 2, 4, 5, 6, 7, 7.5 h). The results indicated that the lengths of the baseline in Egypt were classified short (less than 600 km), medium (600–1,200 km), and long (greater than 1,200 km) and required a minimum observation time of 4, 5, and 7 h to obtain accuracy 10, 19, 48 mm sequentially. The position accuracy was superior for the rapid and the final than the ultra-rapid products by 16%. A short baseline was at the best case; there was a performance in position accuracy with a 57% deduction in observation time compared with the long baseline.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0