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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Astronomy and Space Sciences
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Journal DOI :
The Korean Space Science Society
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Volume & Issues
Volume 27, Issue 4 - Dec 2010
Volume 27, Issue 3 - Sep 2010
Volume 27, Issue 2 - Jun 2010
Volume 27, Issue 1 - Mar 2010
Selecting the target year
SW Lyncis-Advances and Questions
Kim, Chun-Hwey ; Kim, Ho-Il ; Yoon, Tae-Seog ; Han, Won-Yong ; Lee, Jae-Woo ; Lee, Chung-Uk ; Kim, Jin-Hyung ; Koch, Robert H. ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 263~278
DOI : 10.5140/JASS.2010.27.4.263
Many filtered CCD measures form the basis of six new light curves of the eclipsing system SW Lyn. From these measures and additional observations for eclipse timing, 47 new times of minimum light over the time-interval of about 13 years have been calculated. The complex period variability can be sorted into a linear period improvement with 5.8-year and 33.9-year periodic terms. The shorter cyclic term of these is ascribed to a cool companion of the eclipsing pair but the longer one has no testable interpretation at present. The new light curves are synthesized by the 2003 version of the Wilson-Devinney differential corrections computer code. The results incorporate a source of "third light" which comes from the cool companion star that had been identified by the cycling of the period of the eclipsing pair and also had previously been identified spectroscopically. There is a measure of satisfaction with current understanding of the SW Lyn eclipsing system because of consistent syntheses of all historical light curves. This agreeable convergence, however, comes partly at the expense of an unanticipated temperature of the hot star and of a photospheric spot that has no obvious basis in the detached character modeled for the binary. We offer predictions of changes in the stellar parameters if the modeled detached-configuration should be wrong. The SW Lyn stellar system is still difficult to understand.
Properties of the Variation of the Infrared Emission of OH/IR Stars III. The M Band Light Curves
Kwon, Young-Joo ; Suh, Kyung-Won ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 279~288
DOI : 10.5140/JASS.2010.27.4.279
To study properties of the pulsation in the infrared emission for long period variables, we have collected and analyzed the infrared observational data at M band for 12 OH/IR stars. We present the light curves using the data that cover about 30 years including recent observations of ISO and Spitzer. We use Marquardt-Levenberg algorithm to determine the pulsation periods and amplitudes and compare them with previous results of infrared and radio investigations. Generally, the newly determined pulsation parameters show much less errors because of the larger database. We find that the relationship between the pulsation period and amplitudes at M band is fairly well fitted with a simple linear equation in a wide period range. For OH 42.3-0.1, we find some evidences that the object could be a post-asymptotic giant branch star.
Detection of Variable Stars in the Open Cluster M11 Using Difference Image Analysis Pipeline
Lee, Chung-Uk ; Koo, Jae-Rim ; Kim, Seung-Lee ; Lee, Jae-Woo ; Park, Byeong-Gon ; Han, Cheong-Ho ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 289~307
DOI : 10.5140/JASS.2010.27.4.289
We developed a photometric pipeline to be used for a wide field survey. This pipeline employs the difference image analysis (DIA) method appropriate for the photometry of star dense field such as the Galactic bulge. To verify the performance of pipeline, the observed dataset of the open cluster M11 was re-processed. One hundred seventy eight variable stars were newly discovered by analyzing the light curves of which photometric accuracy was improved through the DIA. The total number of variable stars in the M11 observation region is 335, including 157 variable stars discovered by previous studies. We present the catalogue and light curves for the 178 variable stars. This study shows that the photometric pipeline using the DIA is very useful in the detection of variable stars in a cluster.
Integral Field Spectroscopic Data Reduction Method for High Resolution Infrared Observation
Lee, Sung-Ho ; Pak, Soo-Jong ; Choi, Min-Ho ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 309~318
DOI : 10.5140/JASS.2010.27.4.309
We introduce a technical approach for reducing three-dimensional infrared (IR) spectroscopic data generated by integral field spectroscopy or slit-scanning observations. The first part of data reduction using IRAF presents a guideline for processing spectral images from long-slit IR spectroscopy. Multichannel image reconstruction, Image Analysis and Display (MIRIAD) is used in the later part to construct and analyze the data cubes which contain spatial and kinematic information of the objects. This technic has been applied to a sample data set of diffuse 2.1218
1-0 S(1) emission features observed by slit-scanning around Sgr A East in the Galactic center. Details of image processing for the high-dispersion infrared data are described to suggest a sequence of contamination cleaning and distortion correction. Practical solutions for handling data cubes are presented for survey observations with various configurations of slit positioning.
Ionospheric F2-Layer Semi-Annual Variation in Middle Latitude by Solar Activity
Park, Yoon-Kyung ; Kwak, Young-Sil ; Ahn, Byung-Ho ; Park, Young-Deuk ; Cho, Il-Hyun ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 319~327
DOI : 10.5140/JASS.2010.27.4.319
We examine the ionospheric F2-layer electron density variation by solar activity in middle latitude by using foF2 observed at the Kokubunji ionosonde station in Japan for the period from 1997 to 2008. The semi-annual variation of foF2 shows obviously in high solar activity (2000-2002) than low solar activity (2006-2008). It seems that variation of geomagnetic activity by solar activity influences on the semi-annual variation of the ionospheric F2-layer electron density. According to the Lomb-Scargle periodogram analysis of foF2 and Ap index, interplanetary magnetic field (IMF) Bs (IMF Bz <0) component, solar wind speed, solar wind number density and flow pressure which influence the geomagnetic activity, we examine how the geomagnetic activity affects the ionospheric F2-layer electron density variation. We find that the semi-annual variation of daily foF2, Ap index and IMF Bs appear clearly during the high solar activity. It suggests that the semi-annual variation of geomagnetic activity, caused by Russell-McPherron effect, contributes greatly to the ionospheric F2-layer semi-annual electron density variation, except dynamical effects in the thermosphere.
Sources of the High-Latitude Thermospheric Neutral Mass Density Variations
Kwak, Young-Sil ; Richmond, Arthur ; Deng, Yue ; Ahn, Byung-Ho ; Cho, Kyung-Suk ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 329~335
DOI : 10.5140/JASS.2010.27.4.329
We investigate the sources of the variation of the high-latitude thermospheric neutral mass density depending on the interplanetary magnetic field (IMF) conditions. For this purpose, we have carried out the National Center for Atmospheric Research Thermosphere-Ionosphere Electrodynamics General Circulation Model (NCAR-TIEGCM) simulations for various IMF conditions under summer condition in the southern hemisphere. The NCAR-TIEGCM is combined with a new empirical model that provides a forcing to the thermosphere in high latitudes. The difference of the high-latitude thermospheric neutral mass density (subtraction of the values for zero IMF condition from the values for non-zero IMF conditions) shows a dependence on the IMF condition: For negative
condition, there are significantly enhanced difference densities in the dusk sector and around midnight. Under the positive-
condition, there is a decrease in the early morning hours including the dawn side poleward of
. For negative
, the difference of the thermospheric densities shows a strong enhancement in the cusp region and around midnight, but decreases in the dawn sector. In the dusk sector, those values are relatively larger than those in the dawn sector. The density difference under positive-
condition shows decreases generally. The density difference is more significant under negative-
condition than under positive-
condition. The dependence of the density difference on the IMF conditions in high latitudes, especially, in the dawn and dusk sectors can be explained by the effect of thermospheric winds that are associated with the ionospheric convection and vary following the direction of the IMF. In auroral and cusp regions, heating of thermosphere by ionospheric currents and/or auroral particle precipitation can be also the source of the dependence of the density difference on the IMF conditions.
Two-Site Optical Observation and Initial Orbit Determination for Geostationary Earth Orbit Satellites
Choi, Jin ; Choi, Young-Jun ; Yim, Hong-Suh ; Jo, Jung-Hyun ; Han, Won-Yong ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 337~343
DOI : 10.5140/JASS.2010.27.4.337
Optical observation system provides angle-only measurement for orbit determination of space object. Range measurement can be directly acquired using laser ranging or tone ranging system. Initial orbit determination (IOD) by using angle- only data set shows discrepancy according to the measurement time interval. To solve this problem, range measurement data should be added for IOD. In this study, two-site optical observation was used to derive the range information. We have observed nine geostationary earth orbit satellites by using two-site optical observation system. The determination result of the range shows the accuracy over 99.5% compared to the results from the satellite tool kit simulation. And we confirmed that the orbit determination by the Herrick-Gibbs method with the range information obtained from the two-site observation is more accurate than the orbit determination by Gauss method with the one-site observation. For more accurate two-site optical observation, a baseline should satisfy an optimal condition of length and more precise observation system needed.
Operation of the Radio Occultation Mission in KOMPSAT-5
Choi, Man-Soo ; Lee, Woo-Kyoung ; Cho, Sung-Ki ; Park, Jong-Uk ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 345~352
DOI : 10.5140/JASS.2010.27.4.345
Korea multi-purpose satellite-5 (KOMPSAT-5) is a low earth orbit (LEO) satellite scheduled to be launched in 2010. To satisfy the precision orbit determination (POD) requirement for a high resolution synthetic aperture radar image of KOMPSAT-5, KOMPSAT-5 has atmosphere occultation POD (AOPOD) system which consists of a space-borne dual frequency global positioning system (GPS) receiver and a laser retro reflector array. A space-borne dual frequency GPS receiver on a LEO satellite provides position data for the POD and radio occultation data for scientific applications. This paper describes an overview of AOPOD system and operation concepts of the radio occultation mission in KOMPSAT-5. We showed AOPOD system satisfies the requirements of KOMPSAT-5 in performance and stability.
Inertia Estimation of Spacecraft Based on Modified Law of Conservation of Angular Momentum
Kim, Dong-Hoon ; Choi, Dae-Gyun ; Oh, Hwa-Suk ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 353~357
DOI : 10.5140/JASS.2010.27.4.353
In general, the information of inertia properties is required to control a spacecraft. The inertia properties are changed by some activities such as consumption of propellant, deployment of solar panel, sloshing, etc. Extensive estimation methods have been investigated to obtain the precise inertia properties. The gyro-based attitude data including noise and bias needs to be compensated for improvement of attitude control accuracy. A modified estimation method based on the law of conservation of angular momentum is suggested to avoid inconvenience like filtering process for noise-effect compensation. The conventional method is modified and beforehand estimated moment of inertia is applied to improve estimation efficiency of product of inertia. The performance of the suggested method has been verified for the case of STSAT-3, Korea Science Technology Satellite.
Global GPS Ionospheric Modelling Using Spherical Harmonic Expansion Approach
Choi, Byung-Kyu ; Lee, Woo-Kyung ; Cho, Sung-Ki ; Park, Jong-Uk ; Park, Pil-Ho ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 359~366
DOI : 10.5140/JASS.2010.27.4.359
In this study, we developed a global ionosphere model based on measurements from a worldwide network of global positioning system (GPS). The total number of the international GPS reference stations for development of ionospheric model is about 100 and the spherical harmonic expansion approach as a mathematical method was used. In order to produce the ionospheric total electron content (TEC) based on grid form, we defined spatial resolution of 2.0 degree and 5.0 degree in latitude and longitude, respectively. Two-dimensional TEC maps were constructed within the interval of one hour, and have a high temporal resolution compared to global ionosphere maps which are produced by several analysis centers. As a result, we could detect the sudden increase of TEC by processing GPS observables on 29 October, 2003 when the massive solar flare took place.
Analysis of Radiosonde Daily Bias by Comparing Precipitable Water Vapor Obtained from Global Positioning System and Radiosonde
Park, Chang-Geun ; Cho, Jung-Ho ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 367~375
DOI : 10.5140/JASS.2010.27.4.367
In this study, we compared the precipitable water vapor (PWV) data derived from the radiosonde observation data at Sokcho Observatory and the PWV data at Sokcho Global Positioning System (GPS) Observatory provided by Korea Astronomy and Space Science Institute, from 0000 UTC, June 1, 2007 to 1200 UTC, May 31, 2009, and analyzed the radiosonde bias between the day and the night. In the scatter diagram of the daytime and nighttime radiosonde PWV data and the GPS PWV data, dry bias was found in the daytime radiosonde observation as known in the previous study. In addition, for all the rainfall events, the tendency that the wet bias of the radiosonde PWV increased as the GPS PWV decreased and the dry bias of the radiosonde PWV increased as the GPS PWV increased was significantly less distinctive in nighttime than in daytime. The quantitative analysis of the bias and error of the radiosonde PWV data showed that the mean bias decreased in the second year, regardless of nighttime or daytime rainfall, and the non-rainfall root mean square error (RMSE) was similar to that of the previous studies, while the rainfall RMSE was larger to a certain extent.
Conceptual Design of Korea Aerospace Research Institute Lunar Explorer Dynamic Simulator
Rew, Dong-Young ; Ju, Gwang-Hyeok ; Kang, Sang-Wook ; Lee, Sang-Ryool ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 377~382
DOI : 10.5140/JASS.2010.27.4.377
In lunar explorer development program, computer simulator is necessary to provide virtual environments that vehicle confronts in lunar transfer, orbit, and landing missions, and to analyze dynamic behavior of the spacecraft under these environments. Objective of simulation differs depending on its application in spacecraft development cycle. Scope of use cases considered in this paper includes simulation of software based, processor and/or hardware in the loop, and support of ground-based flight test of developed vehicle. These use cases represent early phase in development cycle but reusability of modeling results in the next design phase is considered in defining requirements. A simulator architecture in which simulator platform is located in the middle and modules for modeling, analyzing, and three dimensional visualizing are connected to that platform is suggested. Baseline concepts and requirements for simulator development are described. Result of trade study for selecting simulation platform and approaches of defining other simulator components are summarized. Finally, characters of lunar elevation map data which is necessary for lunar terrain generation is described.
A Study on the Armillary Spheres of the Confucianists in Joseon Dynasty
Lee, Yong-Sam ; Kim, Sang-Hyuk ; Lee, Min-Soo ; Jeong, Jang-Hae ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 383~392
DOI : 10.5140/JASS.2010.27.4.383
Armillary sphere, generally known as, not only astronomical instrument for observing astronomical phenomena but also symbolizes the royal authority and royal political ideology which is based on Confucianism. Among the well-reputed Confucian scholars were built their own armillary spheres. However, these armillary spheres which exist are damaged and most of parts of its have been lost. We analyzed and measured the remnants of armillary spheres which were made by Toegye Lee Hwang, Uam Song Si-Yeol and Goedam Bae Sang-Yeol who were well-reputed Confucian scholars in Joseon Dynasty, and have been executed the restorations of Toegye Lee Hwang and Song Si-Yeols armillary sphere based on the drawings which were drawn as the original form by analysis and measurement of its remnants.
Study on the Preliminary Design of ARGO-M Operation System
Seo, Yoon-Kyung ; Lim, Hyung-Chul ; Rew, Dong-Young ; Jo, Jung-Hyun ; Park, Jong-Uk ; Park, Eun-Seo ; Park, Jang-Hyun ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 393~400
DOI : 10.5140/JASS.2010.27.4.393
Korea Astronomy and Space Science Institute has been developing one mobile satellite laser ranging system named as accurate ranging system for geodetic observation-mobile (ARGO-M). Preliminary design of ARGO-M operation system (AOS) which is one of the ARGO-M subsystems was completed in 2009. Preliminary design results are applied to the following development phase by performing detailed design with analysis of pre-defined requirements and analysis of the derived specifications. This paper addresses the preliminary design of the whole AOS. The design results in operation and control part which is a key part in the operation system are described in detail. Analysis results of the interface between operation-supporting hardware and the control computer are summarized, which is necessary in defining the requirements for the operation-supporting hardware. Results of this study are expected to be used in the critical design phase to finalize the design process.
Analysis of Dark Data of the PICNIC IR Arrays in the CIBER
Lee, D.H. ; Kim, M.G. ; Tsumura, K. ; Zemcov, M. ; Nam, U.W. ; Bock, J. ; Battle, J. ; Hristov, V. ; Renbarger, T. ; Matsumoto, T. ; Sullivan, I. ; Levenson, L.R. ; Mason, P. ; Matsuura, S. ; Kim, G.H. ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 401~406
DOI : 10.5140/JASS.2010.27.4.401
We have measured and analyzed the dark data of two PICNIC IR arrays (P574 and P560) obtained through the Cosmic Infrared Background ExpeRiment (CIBER). First, we identified three types of bad pixels: the cold, the hot, and the transient, which are figured in total as 0.06% for P574 and 0.19% for P560. Then, after the bad pixels were masked, we determined the dark noise to be 20.5
, and the dark current to be 0.6
/sec and 0.7
/sec for P574 and P560, respectively. Finally, we discussed glitches and readout modes for a future mission.
SMI Compatible Simulation Scheduler Design for Reuse of Model Complying with SMP Standard
Koo, Cheol-Hea ; Lee, Hoon-Hee ; Cheon, Yee-Jin ;
Journal of Astronomy and Space Sciences, volume 27, issue 4, 2010, Pages 407~412
DOI : 10.5140/JASS.2010.27.4.407
Software reusability is one of key factors which impacts cost and schedule on a software development project. It is very crucial also in satellite simulator development since there are many commercial simulator models related to satellite and dynamics. If these models can be used in another simulator platform, great deal of confidence and cost/schedule reduction would be achieved. Simulation model portability (SMP) is maintained by European Space Agency and many models compatible with SMP/simulation model interface (SMI) are available. Korea Aerospace Research Institute (KARI) is developing hardware abstraction layer (HAL) supported satellite simulator to verify on-board software of satellite. From above reasons, KARI wants to port these SMI compatible models to the HAL supported satellite simulator. To port these SMI compatible models to the HAL supported satellite simulator, simulation scheduler is preliminary designed according to the SMI standard.