Journal of Astronomy and Space Sciences最新文献_第3页

Design of an Elliptical Orbit for High-Resolution Optical Observation at a Very Low Altitude over the Korean Peninsula 朝鲜半岛极低空高分辨率光学观测椭圆轨道设计

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Journal of Astronomy and Space Sciences Pub Date : 2023-03-01 DOI: 10.5140/jass.2023.40.1.35

Dongwoo Kim, Taejin Chung

{"title":"Design of an Elliptical Orbit for High-Resolution Optical Observation at a Very Low\u0000 Altitude over the Korean Peninsula","authors":"Dongwoo Kim, Taejin Chung","doi":"10.5140/jass.2023.40.1.35","DOIUrl":"https://doi.org/10.5140/jass.2023.40.1.35","url":null,"abstract":"Surveillance and reconnaissance intelligence in the space domain will become\u0000 increasingly important in future battlefield environments. Moreover, to assimilate the\u0000 military provocations and trends of hostile countries, imagery intelligence of the\u0000 highest possible resolution is required. There are many methods for improving the\u0000 resolution of optical satellites when observing the ground, such as designing satellite\u0000 optical systems with a larger diameter and lowering the operating altitude. In this\u0000 paper, we propose a method for improving ground observation resolution by using an\u0000 optical system for a previously designed low orbit satellite and lowering the operating\u0000 altitude of the satellite. When the altitude of a satellite is reduced in a circular\u0000 orbit, a large amount of thrust fuel is required to maintain altitude because the\u0000 satellite’s altitude can decrease rapidly due to atmospheric drag. However, by using the\u0000 critical inclination, which can fix the position of the perigee in an elliptical orbit\u0000 to the observation area, the operating altitude of the satellite can be reduced using\u0000 less fuel compared to a circular orbit. This method makes it possible to obtain a\u0000 similar observational resolution of a medium-sized satellite with the same weight and\u0000 volume as a small satellite. In addition, this method has the advantage of reducing\u0000 development and launch costs to that of a small-sized satellite. As a result, we\u0000 designed an elliptical orbit. The perigee of the orbit is 300 km, the apogee is 8,366.52\u0000 km, and the critical inclination is 116.56°. This orbit remains at its lowest altitude\u0000 to the Korean peninsula constantly with much less orbit maintenance fuel compared to the\u0000 300 km circular orbit.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87929133","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

Constant Acceleration in Fractal Structures with Fractal Dimension D = 2 分形维数D = 2的分形结构中的恒加速度

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Journal of Astronomy and Space Sciences Pub Date : 2023-03-01 DOI: 10.5140/jass.2023.40.1.29

A. Yushchenko, Yeuncheol Jeong, V. Yushchenko, A. Demessinova, K. S. Jeong

引用次数: 0

Observation of Three Variable Stars and an Asteroid Using Small Telescopes in the United Arab Emirates (UAE) 在阿拉伯联合酋长国用小型望远镜观测三颗变星和一颗小行星

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Journal of Astronomy and Space Sciences Pub Date : 2023-03-01 DOI: 10.5140/jass.2023.40.1.19

M. Odeh, M. Al-Wardat

{"title":"Observation of Three Variable Stars and an Asteroid Using Small Telescopes in the\u0000 United Arab Emirates (UAE)","authors":"M. Odeh, M. Al-Wardat","doi":"10.5140/jass.2023.40.1.19","DOIUrl":"https://doi.org/10.5140/jass.2023.40.1.19","url":null,"abstract":"We present the results of using small telescopes in the United Arab Emirates\u0000 (UAE) for observing variable stars and asteroids. Two telescopes, namely, 5”\u0000 apochromatic refractor and 14” Schmidt-Cassegrain, at Al-Khatim Observatory (M44) were\u0000 used for the observations. The targets were the three variable stars RR GEM, AG LMi, and\u0000 DL CMi and the asteroid 22 Kalliope. We found a good consistency between our light\u0000 curves and published ones for the calibration targets, i.e., the asteroid 22 Kalliope\u0000 and the variable star RR GEM. According to previous studies, AG LMi has two suggested\u0000 periods, 16.3 hours and 32.62 hours. Our results clearly confirm the second one, with a\u0000 period of 32.6175 hours. The star DL CMi has several suggested periods as per previous\u0000 studies, such as 4.0173 days, 1.9606 days, and 2.0086 days. Our observations confirm the\u0000 first one, with a period of 4.0159 days. These results demonstrate the effectiveness of\u0000 using small telescopes for observing variable stars and asteroids. This work provides\u0000 some recommendations on using small telescopes for such observations.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91102117","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

Fundamentals of Numerical Modeling of the Mid-latitude Ionosphere 中纬度电离层数值模拟基础

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Journal of Astronomy and Space Sciences Pub Date : 2023-03-01 DOI: 10.5140/jass.2023.40.1.11

G. Jee

引用次数: 1

The Chemical Composition of HD47536: A Planetary Host Halo Giant with Possible λ Bootis Features and Signs of Interstellar Matter Accretion HD47536的化学成分:一个可能具有λ牧夫座特征和星际物质吸积迹象的行星宿主光环巨星

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Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.169

A. Yushchenko, D. Doikov, S. Andrievsky, Yeuncheol Jeong, V. Yushchenko, P. Rittipruk, V. Kovtyukh, A. Demessinova, V. Gopka, A. Raikov, K. S. Jeong

引用次数: 0

Analysis of the Tsyganenko Magnetic Field Model Accuracy during Geomagnetic Storm Times Using the GOES Data 利用GOES数据分析地磁暴期间Tsyganenko磁场模型的精度

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Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.159

Seok-Min Song, K. Min

{"title":"Analysis of the Tsyganenko Magnetic Field Model Accuracy during Geomagnetic Storm\u0000 Times Using the GOES Data","authors":"Seok-Min Song, K. Min","doi":"10.5140/jass.2022.39.4.159","DOIUrl":"https://doi.org/10.5140/jass.2022.39.4.159","url":null,"abstract":"Because of the small number of spacecraft available in the Earth’s magnetosphere\u0000 at any given time, it is not possible to obtain direct measurements of the fundamental\u0000 quantities, such as the magnetic field and plasma density, with a spatial coverage\u0000 necessary for studying, global magnetospheric phenomena. In such cases, empirical as\u0000 well as physics-based models are proven to be extremely valuable. This requires not only\u0000 having high fidelity and high accuracy models, but also knowing the weakness and\u0000 strength of such models. In this study, we assess the accuracy of the widely used\u0000 Tsyganenko magnetic field models, T96, T01, and T04, by comparing the calculated\u0000 magnetic field with the ones measured in-situ by the GOES satellites during\u0000 geomagnetically disturbed times. We first set the baseline accuracy of the models from a\u0000 data-model comparison during the intervals of geomagnetically quiet times. During quiet\u0000 times, we find that all three models exhibit a systematic error of about 10% in the\u0000 magnetic field magnitude, while the error in the field vector direction is on average\u0000 less than 1%. We then assess the model accuracy by a data-model comparison during twelve\u0000 geomagnetic storm events. We find that the errors in both the magnitude and the\u0000 direction are well maintained at the quiet-time level throughout the storm phase, except\u0000 during the main phase of the storms in which the largest error can reach 15% on average,\u0000 and exceed well over 70% in the worst case. Interestingly, the largest error occurs not\u0000 at the Dst minimum but 2–3 hours before the minimum. Finally, the T96 model has\u0000 consistently underperformed compared to the other models, likely due to the lack of\u0000 computation for the effects of ring current. However, the T96 and T01 models are\u0000 accurate enough for most of the time except for highly disturbed periods.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79537922","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

Spectral Deconvolution Analysis of Mafic Mineral in Irregular Mare Patches on the Moon 月球不规则海斑中镁铁质矿物的光谱反卷积分析

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Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.127

I. Hong, Yu Yi, Nuri Park

{"title":"Spectral Deconvolution Analysis of Mafic Mineral in Irregular Mare Patches on the\u0000 Moon","authors":"I. Hong, Yu Yi, Nuri Park","doi":"10.5140/jass.2022.39.4.127","DOIUrl":"https://doi.org/10.5140/jass.2022.39.4.127","url":null,"abstract":"Irregular mare patches (IMPs), recently discovered on the Moon, are eruptions of\u0000 magma on the lunar surface, and their origins are still in question. While prior studies\u0000 on IMPs have mainly focused on optical image analysis, in this study, an analysis of the\u0000 characteristics of minerals is performed exemplary for the first time. Modified Gaussian\u0000 model (MGM) deconvolution was applied to the infrared spectrum to confirm the properties\u0000 of the mafic mineral. Mafic minerals were analyzed for 6 olivine-rich (Ol-rich) IMPs out\u0000 of 91 currently reported, and only 4 of them yielded results of significance. All four\u0000 sites showed more abundance of Fe than Mg, and manifested a weak relationship with\u0000 Mg-suite rock. However, a problem was discovered during the MGM application process due\u0000 to pilot implementation. In order to solve this problem, it is required to adjust the\u0000 MGM initial condition settings more precisely and to increase the signal to noise ratio\u0000 of the observation data. Moreover, it is necessary to analyze the mineral properties for\u0000 all IMPs considering minerals other than Ol and utilize them to deduce the origin of the\u0000 IMPs.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90199790","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

Energetic Electron and Proton Interactions with Pc5 Ultra Low Frequency (ULF) Waves during the Great Geomagnetic Storm of 15–16 July 2000 2000年7月15-16日大磁暴期间，高能电子和质子与Pc5超低频波的相互作用

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Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.145

E. Lee, I. Mann, L. Ozeke

{"title":"Energetic Electron and Proton Interactions with Pc5 Ultra Low Frequency (ULF) Waves\u0000 during the Great Geomagnetic Storm of 15–16 July 2000","authors":"E. Lee, I. Mann, L. Ozeke","doi":"10.5140/jass.2022.39.4.145","DOIUrl":"https://doi.org/10.5140/jass.2022.39.4.145","url":null,"abstract":"The dynamics of the outer zone radiation belt has received a lot of attention\u0000 mainly due to the correlation between the occurrence of enhancing relativistic electron\u0000 flux and spacecraft operation anomalies or even failures (e.g., Baker et al. 1994).\u0000 Relativistic electron events are often observed during great storms associated with\u0000 ultra low frequency (ULF) waves. For example, a large buildup of relativistic electrons\u0000 was observed during the great storm of March 24, 1991 (e.g., Li et al. 1993; Hudson et\u0000 al. 1995; Mann et al. 2013). However, the dominant processes which accelerate\u0000 magnetospheric radiation belt electrons to MeV energies are not well understood. In this\u0000 paper, we present observations of Pc5 ULF waves in the recovery phase of the Bastille\u0000 day storm of July 16, 2000 and electron and proton flux simultaneously oscillating with\u0000 the same frequencies as the waves. The mechanism for the observed electron and proton\u0000 flux modulations is examined using groundbased and satellite observations. During this\u0000 storm time, multiple packets of discrete frequency Pc5 ULF waves appeared associated\u0000 with energetic particle flux oscillations. We model the drift paths of electrons and\u0000 protons to determine if the particles drift through the ULF wave to understand why some\u0000 particle fluxes are modulated by the ULF waves and others are not. We also analyze the\u0000 flux oscillations of electrons and protons as a function of energy to determine if the\u0000 particle modulations are caused by a ULF wave drift resonance or advection of a particle\u0000 density gradient. We suggest that the energetic electron and proton modulations by Pc5\u0000 ULF waves provide further evidence in support of the important role that ULF waves play\u0000 in outer radiation belt dyanamics during storm times.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87858407","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

Korea Pathfinder Lunar Orbiter Flight Dynamics Simulation and Rehearsal Results for Its Operational Readiness Checkout 韩国探路者月球轨道飞行器运行动力学模拟和预演结果

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.181

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

{"title":"Korea Pathfinder Lunar Orbiter Flight Dynamics Simulation and Rehearsal Results for\u0000 Its Operational Readiness Checkout","authors":"Young-Joo Song, Jonghee Bae, Seung-Su Hong, Jun Bang","doi":"10.5140/jass.2022.39.4.181","DOIUrl":"https://doi.org/10.5140/jass.2022.39.4.181","url":null,"abstract":"Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, was successfully\u0000 launched on 4 Aug. from Cape Canaveral Space Force Station using a Space-X Falcon-9\u0000 rocket. Flight dynamics (FD) operational readiness was one of the critical parts to be\u0000 checked before the flight. To demonstrate FD software’s readiness and enhance the\u0000 operator’s contingency response capabilities, KPLO FD specialists planned, organized,\u0000 and conducted four simulations and two rehearsals before the KPLO launch. For the\u0000 efficiency and integrity of FD simulation and rehearsal, different sets of blind test\u0000 data were prepared, including the simulated tracking measurements that incorporated\u0000 dynamical model errors, maneuver execution errors, and other errors associated with a\u0000 tracking system. This paper presents the simulation and rehearsal results with lessons\u0000 learned for the KPLO FD operational readiness checkout. As a result, every functionality\u0000 of FD operation systems is firmly secured based on the operation procedure with an\u0000 enhancement of contingency operational response capability. After conducting several\u0000 simulations and rehearsals, KPLO FD specialists were much more confident in the flight\u0000 teams’ ability to overcome the challenges in a realistic flight and FD software’s\u0000 reliability in flying the KPLO. Moreover, the results of this work will provide numerous\u0000 insights to the FD experts willing to prepare deep space flight operations.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90595244","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: 4

Investigation of the Characteristic Nighttime Temperature of Potential Caves on Mars 火星上潜在洞穴夜间温度特征的研究

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Journal of Astronomy and Space Sciences Pub Date : 2022-12-01 DOI: 10.5140/jass.2022.39.4.141

Nuri Park, I. Hong, Jongil Jung

引用次数: 0