• 제목/요약/키워드: space science

검색결과 14,636건 처리시간 0.038초

Korean Contribution to All-Sky Near-infrared Spectro-Photometric Survey

  • Jeong, Woong-Seob;Pyo, Jeonghyun;Park, Sung-Joon;Moon, Bongkon;Lee, Dae-Hee;Park, Won-Kee;Lee, Duk-Hang;Ko, Kyeongyeon;Kim, Il-Joong;Kim, Minjin;Yang, Yujin;Ko, Jongwan;Song, Yong-Seon;Yu, Young Sam;Im, Myungshin;Lee, Hyung Mok;Lee, Jeong-Eun;Shim, Hyunjin;Matsumoto, Toshio
    • 천문학회보
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    • 제41권2호
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    • pp.37.3-37.3
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    • 2016
  • The SPEHREx (Spectro-Photometer for the History of the Universe Epoch of Reionization, and Ices Explorer) is one of the candidates for the Astrophysical Small Explore mission of the NASA proposed together with KASI (PI Institute: Caltech). It will perform an all-sky near-infrared spectral survey to probe the origin of the Universe and water in the planetary systems and to explore the evolution of galaxies. The SPHEREx is designed to cover wide field of view of $3.5{\times}7deg$. as well as wide spectral range from 0.7 to $4.8{\mu}m$ by using four linear variable filters. The SPHEREx is under the Phase-A study to finalize the conceptual design and test plan of the instrument. The international partner, KASI will contribute to the SPHEREx in the hardware as well as the major science cases. The final selection will be made in the early 2017. Here, we report the current status of the SPHEREx mission.

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MIRIS EOC 주경의 광기계 해석 (Opto-mechanical Analysis for Primary Mirror of Earth Observation Camera of the MIRIS)

  • 박귀종;문봉곤;박성준;박영식;이대희;이창희;나자경;정웅섭;표정현;이덕행;남욱원;이승우;양순철;한원용
    • 한국광학회지
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    • 제22권6호
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    • pp.262-268
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    • 2011
  • 한국천문연구원이 개발한 다목적적외선영상시스템(Multi-purpose IR Imaging System, MIRIS)은 과학기술위성 3호(STSAT-3)의 주탑재체이다. 지구관측카메라(Earth Observation Camera, EOC)는 MIRIS를 구성하는 두 개의 적외선 카메라 중에 하나로, 지구의 $3{\sim}5{\mu}m$ 파장대의 적외선을 관측하기 위한 카메라이다. EOC의 광학계는 카세그레인 방식으로써 구경이 100 mm이고, 주경과 부경은 모두 비구면 반사경이다. EOC 주경의 플렉서는 링 타입으로써 발사환경에서 주경이 겪을 수 있는 충격과 진동을 견디도록 예압을 가하며 주경을 지지한다. 이는 마치 리테이너로 렌즈를 지지하는 것과 같은 메커니즘으로 주경을 지지하기 위한 시도이다. 광기계 해석을 통해 EOC 주경이 효과적으로 지지되고 있음을 확인했다.

Automatic real-time system of the global 3-D MHD model: Description and initial tests

  • Park, Geun-Seok;Choi, Seong-Hwan;Cho, Il-Hyun;Baek, Ji-Hye;Park, Kyung-Sun;Cho, Kyung-Suk;Choe, Gwang-Son
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2009년도 한국우주과학회보 제18권2호
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    • pp.26.2-26.2
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    • 2009
  • The Solar and Space Weather Research Group (SOS) in Korea Astronomy and Space Science Institute (KASI) is constructing the Space Weather Prediction Center since 2007. As a part of the project, we are developing automatic real-time system of the global 3-D magnetohydrodynamics (MHD) simulation. The MHD simulation model of earth's magnetosphere is designed as modified leap-frog scheme by T. Ogino, and it was parallelized by using message passing interface (MPI). Our work focuses on the automatic processing about simulation of 3-D MHD model and visualization of the simulation results. We used PC cluster to compute, and virtual reality modeling language (VRML) file format to visualize the MHD simulation. The system can show the variation of earth's magnetosphere by the solar wind in quasi real time. For data assimilation we used four parameters from ACE data; density, pressure, velocity of solar wind, and z component of interplanetary magnetic field (IMF). In this paper, we performed some initial tests and made a animation. The automatic real-time system will be valuable tool to understand the configuration of the solar-terrestrial environment for space weather research.

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차세대 위성항법체계 갈릴레오 센서스테이션 유치 후보지 전파 수신환경 조사: I. KVN 탐라전파천문대 인근 부지에 대한 2006년 한국천문연구원 조사 결과 (RF ENVIRONMENT TEST ON A PROPOSED SITE FOR THE SENSOR STATION OF THE NEXT GENERATION SATELLITE NAVIGATION SYSTEM, GALILEO: I. THE RESULT OF THE TEST ON THE VICINITY OF KVN TAMLA SITE IN THE YEAR OF 2006 BY KASI)

  • 조중현;제도흥;조성기;최병규;백정호;이대규;정현수;임형철;조정호;이우경;정성욱;박종욱;최남미
    • Journal of Astronomy and Space Sciences
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    • 제25권1호
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    • pp.43-52
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    • 2008
  • 2007년에 Giove-A 실험위성의 항법메시지 송신 시험이 성공적으로 끝마침으로써, 차세대 위성 항법시스템인 갈릴레오 계획이 초기궤도 검증단계를 앞두고 있다. 한국천문연구원의 우주측지연구부와 전파천문연구부는 제주 탐라대학교 내 유치 후보지에 대한 갈릴레오 센서 스테이션 전파 수신환경 공동조사를 2006년 8월 3일부터 5일까지 실시했다. 전계강도 스펙트럼은 전 대역$(800{\sim}2000MHz)$과 내 대역(E5, E6, L1 밴드)에 대해서 24시간 주파수 영역 관측을 했다. 이 단계에서 관측된 강한 내 대역 간섭 신호에 대해서 시간영역 분석을 했다.

Development of a diagnostic coronagraph on the ISS: progress report

  • Kim, Yeon-Han;Choi, Seonghwan;Bong, Su-Chan;Cho, Kyungsuk;Park, Young-Deuk;Newmark, Jeffrey;Gopalswamy, Nat.;Yashiro, Seiji;Reginald, Nelson
    • 천문학회보
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    • 제45권1호
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    • pp.44.2-44.2
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    • 2020
  • The Korea Astronomy and Space Science Institute (KASI) has been collaborating with the NASA Goddard Space Flight Center (GSFC), to install a diagnostic coronagraph on the International Space Station (ISS). The coronagraph is designed to obtain simultaneous measurements of electron density, temperature, and velocity using multiple filters in the 3-10 Rs range. In 2019, we developed a new coronagraph and launched it on a stratospheric balloon (BITSE) from Fort Sumner, New Mexico in USA. As the next step, the coronagraph will be further developed, installed and operated on the ISS (CODEX) in 2023 to understand the physical conditions in the solar wind acceleration region, and enable and validate the next generation space weather models. In this presentation, we will report recent progress and introduce future plan.

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차세대 태양영상분광망원경 글로벌 네트워크: 세 개의 눈을 통한 우주환경예보과 채층활동 연구 (Next Generation Solar Telescope Global Network: Three Eyes for the Studies on the Space Weather Prediction and the Solar Chromospheric Activities)

  • Yang, Heesu;Choi, Seounghwan;Kim, Jihun;Kim, Sujin;Lim, Eun-Kyung;Kang, Juhyung;Song, Dong-Uk;Baek, Ji-Hye;Park, Jongyeob
    • 천문학회보
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    • 제46권2호
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    • pp.79.1-79.1
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    • 2021
  • NxST는 현재 천문연에서 개발중인 30cm 구경의 태양 망원경으로 태양 채층의 모습을 약 1각초의 적정한 영상 해상도로 고분광분해능의 채층선 스펙트럼 자료를 고속으로 얻어낼 수 있다. NxST는 미국과 유럽, 그리고 국내 1대를 건설하여 전지구적으로 연속적인 데이터를 획득할 수 있다. NxST의 관측자료는 1) 우주환경예보의 최초이며 유일인자인 태양을 실시간으로 감시할 수 있고 2) 태양 채층의 파동과 관련된 연구를 수행하는데 활용될 수 있다. 본 발표에서는 NxST의 연구주제들을 살펴보고 이로부터 도출된 시스템의 개념 설계를 제시한다.

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Observational performance of the KMTNet system

  • Lee, Chung-Uk;Kim, Seung-Lee;Cha, Sang-Mok;Lee, Yongseok;Kim, Dong-Jin;Park, Byeong-Gon;Lee, Dong-Joo;Koo, Jae-Rim;Hong, Kyeongsoo;Lee, Jae Woo;Ryu, Yoon-Hyun;Lim, Beomdu;Lim, Jin-Sun;Gho, Seung-Won;Kim, Min-Jun
    • 천문학회보
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    • 제40권1호
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    • pp.55.2-55.2
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    • 2015
  • 한국천문연구원에서는 2도${\times}$2도 시야의 1.6m 광시야 망원경과 $18k{\times}18k$ 모자이크 CCD 카메라로 이루어진 관측시스템을 남반구천문대 3곳에 설치하여 24시간 모니터링 관측이 가능한 Korea Microlensing Telescope Network(KMTNet)을 구축하고 있다. 망원경 1,2,3호기는 각각 칠레 CTIO, 남아공 SAAO, 호주 SSO 관측소에 2014년말 까지 성공적으로 설치 완료하였으며, 2015년 2월 현재 칠레와 남아공에는 연구용 18k CCD 카메라, 호주에는 시험관측용 4k CCD 카메라를 부착하여 시험관측을 수행중이다. 시험관측을 통해 KMTNet 시스템에서 가장 중요한 부분인 광시야 광학계가 요구사양을 만족함을 확인하였고, 과학연구 수행에 어려움이 없을 것으로 예상한다. 우리는 시험관측을 통해 얻어진 각각의 시스템 성능을 검토하고, 관측 후 파일전송, 전처리 및 자료 배포와 더불어 안정적인 측광성능 유지를 위한 시스템 운영 및 향후 계획에 대하여 발표한다.

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Preliminary Thermal Analysis of NISS onboard NEXTSat-1

  • Lee, Dukhang;Moon, Bongkon;Park, Sung-Joon;Jeong, Woong-Seob;Suh, Jeong-Ki;Pyo, Jeonghyun;Park, Youngsik;Lee, Dae-Hee;Kim, Il-Joong;Park, Won-Kee;Ko, Kyeongyeon;Kim, Min-Gyu;Nam, Uk-Won;Park, Chan;Shin, Goo-Whan;Matsumoto, Toshio;Han, Wonyong
    • 천문학회보
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    • 제39권2호
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    • pp.108.1-108.1
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    • 2014
  • Near-infrared Imaging Spectrometer for Star formation history (NISS), one of the main payloads of NEXTSat-1, is being developed by Korea Astronomy & Space Science Institute (KASI). Since NISS adopts an infrared reflecting optical system, its performance is highly sensitive to changes in system temperature. Therefore, it is important to figure out the temperature through thermal analysis and cooling tests in order to optimize the optical system design. We conducted thermal analysis of NISS for the recently updated model, and obtained steady state temperature of the optical system for two cases of satellite attitude: about 190 K for the Normal case and about 210 K for the Hot case. In this paper, we present thermal design of NISS and the preliminary thermal analysis results.

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Development of Optical System for ARGO-M

  • Nah, Jakyoung;Jang, Jung-Guen;Jang, Bi-Ho;Han, In-Woo;Han, Jeong-Yeol;Park, Kwijong;Lim, Hyung-Chul;Yu, Sung-Yeol;Park, Eunseo;Seo, Yoon-Kyung;Moon, Il-Kwon;Choi, Byung-Kyu;Na, Eunjoo;Nam, Uk-Won
    • Journal of Astronomy and Space Sciences
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    • 제30권1호
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    • pp.49-58
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    • 2013
  • ARGO-M is a satellite laser ranging (SLR) system developed by the Korea Astronomy and Space Science Institute with the consideration of mobility and daytime and nighttime satellite observation. The ARGO-M optical system consists of 40 cm receiving telescope, 10 cm transmitting telescope, and detecting optics. For the development of ARGO-M optical system, the structural analysis was performed with regard to the optics and optomechanics design and the optical components. To ensure the optical performance, the quality was tested at the level of parts using the laser interferometer and ultra-high-precision measuring instruments. The assembly and alignment of ARGO-M optical system were conducted at an auto-collimation facility. As the transmission and reception are separated in the ARGO-M optical system, the pointing alignment between the transmitting telescope and receiving telescope is critical for precise target pointing. Thus, the alignment using the ground target and the radiant point observation of transmitting laser beam was carried out, and the lines of sight for the two telescopes were aligned within the required pointing precision. This paper describes the design, structural analysis, manufacture and assembly of parts, and entire process related with the alignment for the ARGO-M optical system.

Study on the Optoelectronic Design for Korean Mobile Satellite Laser Ranging System

  • Lim, Hyung-Chul;Bang, Seong-Cheol;Yu, Sung-Yeol;Seo, Yoon-Kyung;Park, Eun-Seo;Kim, Kwang-Dong;Nah, Ja-Kyoung;Jang, Jeong-Gyun;Jang, Bi-Ho;Park, Jang-Hyun;Park, Jong-Uk
    • Journal of Astronomy and Space Sciences
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    • 제28권2호
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    • pp.155-162
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    • 2011
  • Korea Astronomy and Space Science Institute has been developing one mobile and one stationary satellite laser ranging system for the space geodesy research and precise orbit determination since 2008, which are called as ARGO-M and ARGO-F, respectively. They will be capable of daytime laser ranging as well as nighttime and provide the accurate range measurements with millimeter level precision. Laser ranging accuracy is mostly dependent on the optics and optoelectronic system which consists of event timer, optoelectronic controller and photon detectors in the case of ARGO-M. In this study, the optoelectronic system of ARGO-M is addressed and its critical design is also presented. Additionally, the experiment of the integrated optoelectronic system was performed in the laboratory to validate the functional operation of each component and its results are analyzed to investigate ARGO-M performance in advance.