A5010272269- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Space Satellite Systems and Control
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Inertial Sensor and Navigation
- Space Exploration and Technology
- Distributed and Parallel Computing Systems
- Solar and Space Plasma Dynamics
- Advanced Optical Sensing Technologies
- Spacecraft Design and Technology
- Adaptive optics and wavefront sensing
- Satellite Communication Systems
- Space exploration and regulation
- Particle Accelerators and Free-Electron Lasers
- Advanced Neural Network Applications
- Scientific Measurement and Uncertainty Evaluation
- Evaluation and Performance Assessment
- Ionosphere and magnetosphere dynamics
- Advanced Vision and Imaging
Korea Astronomy and Space Science Institute
2015-2024
Nanjing University
2023
Space Science Institute
2015
Context. The JAXA Hayabusa2 mission will perform the first ever sample return from a primitive asteroid. target near-Earth asteroid (162173) Ryugu be reached in mid-2018 and its samples returned to Earth by end of 2020. Aims. We want improve current knowledge compositional rotational properties Ryugu, which are still presenting some uncertainties that might affect operations scientific return. Methods. acquired high-quality photometric time-series data with FORS2 instrument at Very Large...
Abstract We describe results of a planetary defense exercise conducted during the close approach to Earth by near-Earth asteroid (99942) Apophis 2020 December–2021 March. The community has been conducting observational campaigns since 2017 test operational readiness global capabilities. These community-led exercises were carried out with support NASA’s Planetary Defense Coordination Office and International Asteroid Warning Network. campaign is third in our series exercises. goal this was...
Abstract On 2020 April 29, the near-Earth object (52768) 1998 OR2 experienced a close approach to Earth at distance of 16.4 lunar distances (LD). is potentially hazardous asteroid absolute magnitude H = 16.04 that can currently come as 3.4 LD. We report here observations this in polarimetry, photometry, and radar. Our show physical characteristics are similar those both M- S-type asteroids. Arecibo’s radar provide high albedo <?CDATA ${\hat{\sigma }}_{\mathrm{OC}}\,=$?> <mml:math...
Abstract As part of the International Asteroid Warning Network's observational exercises, we conducted a campaign to observe near-Earth asteroid 2019 XS around its close approach Earth on 2021 November 9. The goal was characterize errors in observation times reported Minor Planet Center, which become an increasingly important consideration as astrometric accuracy improves and more fast-moving asteroids are observed. exercise, total 957 observations during encounter were subsequently analyzed...
By using the Optical Wide-field Patrol (OWL) network developed by Korea Astronomy and Space Science Institute (KASI) we generated right ascension declination angle data from optical observation of Low Earth Orbit (LEO) satellites. We performed an analysis to verify optimum number observations needed per arc for successful estimation orbit. The currently functioning OWL observatories are located in Daejeon (South Korea), Songino (Mongolia), Oukaïmeden (Morocco). Observatory is as a test bed....
Context. The close approach of the near-Earth asteroid (99942) Apophis to Earth in 2029 will provide a unique opportunity examine how physical properties could be changed due Earth's gravitational perturbation. As result, Republic Korea is planning rendezvous mission Apophis. Aims. Our aim was use photometric data from apparitions 2020-2021 refine shape model and spin state Methods. Using thirty-six 1 2-m class ground-based telescopes Transiting Exoplanet Survey Satellite, we performed...
We estimated the orbit of Communication, Ocean and Meteorological Satellite (COMS), a Geostationary Earth Orbit (GEO) satellite, through data from actual optical observations using telescopes at Sobaeksan Optical Astronomy Observatory (SOAO) Korea Space Science Institute (KASI), Wide field Patrol (OWL) KASI, Chungbuk National University (CNUO) August 1, 2014, to January 13, 2015. The astrometric satellite were extracted World Coordinate System (WCS) in obtained images, geometrically...
Abstract The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for second observing campaign to test the timing accuracy astrometric observation. With 82 participating stations, International Asteroid Warning Network collected 1046 observations around time approach. Compared previous targeting 2019 XS, some individual observers were able significantly improve their reported observation times. In particular, U.S. surveys achieved...
The taxonomic classification of asteroids has been mostly based on spectroscopic observations with wavelengths spanning from the VIS to NIR. VIS-NIR spectra $\sim$2500 have obtained since 1970s; SDSS MOC 4 was released $\sim$4 $\times$ 10$^{5}$ measurements asteroid positions and colors in early 2000s. A number works then devised methods classify these data within framework existing systems. Some works, however, used 2D parameter space that displayed a continuous distribution clouds points...
As a governmentally approved domestic entity for Space Situational Awareness, Korea Astronomy and Science Institute (KASI) is developing operating an optical telescopes system, Optical Wide-field PatroL (OWL) Network. During the test phase of this it necessary to determine range brightness observable satellites. We have defined standard magnitude Low Earth Orbit (LEO) satellites calibrate their luminosity in terms parameters such as distance, angle, angular rate. In work, we report five LEO...
We conduct BVRI and R band photometric observations of asteroid (5247) Krylov from January 2016 to April for 51 nights using the Korea Microlensing Telescope Network (KMTNet). The color indices at light curve maxima are determined as <TEX>$B-V=0.841{\pm}0.035$</TEX>, <TEX>$V-R=0.418{\pm}0.031$</TEX>, <TEX>$V-I=0.871{\pm}0.031$</TEX> where phase angle is <TEX>$14.1^{\circ}$</TEX>. They acquired after standardization instrumental measurements ensemble normalization technique. Based on indices,...
A strategy is needed for a regional survey of geosynchronous orbits (GSOs) to monitor known space objects and detect uncataloged objects. On the basis Inter-Agency Debris Committee's recommendation regarding protected region Earth orbit (GEO), target satellites with perigee apogee <TEX>$GEO{\pm}200km$</TEX> various inclinations are selected analysis. The status GSO was analyzed using satellite distribution based on orbital characteristics in publicly available two-line element data. Natural...
Abstract We report the multiband photometry of asteroids observed over 14 nights from 2015 December to 2017 using Korea Microlensing Telescope Network telescopes with taxonomic classification those objects. The data set contains 6793 in Sloan Digital Sky Survey griz bands. Following method DeMeo & Carry, we define criteria on 2D color plane assign nine types (A, B, C, K, L&D, O, S, V, and X) for also determine asteroid taxonomy newly defined 3D space as suggested by Roh et al. seven...
Aims. The satellite Linus orbiting the main-belt asteroid (22) Kalliope exhibited mutual occultation and transit events in late 2021. A photometric campaign was organised observations were undertaken by TRAPPIST-South, SPECULOOS-Artemis, OWL-Net, BOAO telescopes, with goal to further constrain dynamical models of this sizeable asteroid-satellite system. Methods. Our model is sufficiently complex, featuring multipoles (up order ℓ = 2), internal tides, external tides. constrained astrometry...
Several optical monitoring strategies by a ground-based telescope to protect Geostationary Earth Orbit (GEO) satellite from collisions with close approaching objects were investigated. Transfer (GTO) objects, Inclined GeoSynchronous (IGSO) and drifted GEO forced natural perturbations are hazardous operational satellites regarding issues related approaches. The status of these was analyzed on the basis their orbital characteristics in Two-Line Element (TLE) data Joint Space Operation Center...
Abstract Korea Astronomy and Space Science Institute (KASI) successfully completed the development of Microlensing Telescope Network (KMTNet, Park et al . 2012) in mid-2015, following which it conducted test runs for several months. ‘DEep Ecliptic Patrol Southern sky’ (DEEP-South, Moon 2015), will be used asteroid comet studies, not only characterize targeted asteroids, carrying out blind surveys toward sweet spots, but also mine data such bodies using KMTNet archive. We report preliminary...
Abstract We started ‘DEep Ecliptic Patrol of the Southern sky’ (DEEP-South, DS) (Moon et al . 2015) in late 2012, and conducted test runs with first Korea Microlensing Telescope Network (KMTNet) (Park 2012), a 1.6 m telescope 18k x CCD stationed at CTIO early 2015. While primary objective DEEP-South is physical characterization small Solar System bodies, it also expected to discover large number such many them previously unknown. An automated observation scheduling, data reduction analysis...
Abstract Korea Microlensing Telescope Network (KMTNet) which consists of three identical 1.6 m wide-field telescopes with 18k × CCDs, is the first optical survey system its kind. The combination fast optics and mosaic CCD delivers seeing limited images over a 4 square degrees field view. main science goal KMTNet discovery characterization exoplanets, yet it also offers various other applications including DEep Ecliptic Patrol SOUTHern sky (DEEP-South). aim DEEP-South to discover characterize...
Recent narrow-band Ca photometry discovered two distinct red giant branch (RGB) populations in some massive globular clusters (GCs) including M22, NGC 1851, and 288. In order to investigate the differences light/heavy elements abundances between subpopulations, we have performed low-resolution spectroscopy for stars on RGBs these GCs. We find a significant difference (more than <TEX>$4{\sigma}$</TEX>) calcium abundance from spectroscopic HK' index both M22 1851. also more...
The Korean Institute of Technology Satellite (KITSAT-1) is the first satellite developed by Research Center and University Surrey. KITSAT-1 orbiting Earth’s orbit as space debris with a 1,320 km altitude after planned mission. Due to its relatively small size altitude, tracking was difficult task. In this research, we analyzed results for one year using Midland Space Radar (MSR) in Texas Poker Flat Incoherent Scatter (PFISR) Alaska operated LeoLabs, Inc. were on weekly basis MSR PFISR....
The OWL@OUKA is the Optical Wide-field patroL (OWL) facility designed and built by Korea Astronomy Space Science Institute (KASI) installed in 2015 at Oukaimeden Observatory. For first time we used opportunities offered this instrument for detection monitoring exoplanets transit method. In work, present, first, validation of method reporting observations have done to calibrate order chose best exposure a given star. We report on results obtained form observations, V filter, known event...