Journal of Astronomy and Space Sciences

About Journal of Astronomy and Space Sciences

The Journal of Astronomy and Space Sciences (JASS; J. Astron. Space Sci.) is the official publication of the Korean Space Science Society (KSSS), the most prestigious academic society in the fields of space science and space applications in Korea. JASS is an international journal devoted to the publication of fundamental and applied investigations in all aspects of spacerelated science and technology. It was launched in 1984 and is published quarterly. Each article published is assigned a unique DOI that serves to identify the article in the digital environment. JASS is an open access journal; consequently, the full texts of articles are free for all users to read and use. The papers published in JASS are accessible on the journal homepage (http://janss.kr), the DOAJ website, and the SAO/NASA ADS website. JASS has been indexed by KCI and SCOPUS since 2007 and 2012, respectively. Additionally, JASS was re-indexed by DOAJ and newly indexed in the ESCI (Emerging Sources Citation Index) by Clarivate Analytics in 2017. This journal is supported in part by a Grant-in-Aid for the publication of scientific research from the Korean Federation of Science and Technology Societies (KOFST).
Research Paper

Jun 15, 2026

Revisit Time Analysis Framework of Low Earth Orbit Constellation for Various Payloads using MATLAB

Hongseok Kim, Su-Jin Choi

J. Astron. Space Sci. 2026;43(2):35-53.
https://doi.org/10.5140/JASS.2026.43.2.35

In this study, we present analysis of revisit-time characteristics of low Earth orbit (LEO) satellite constellations intended for Earth observation missions. The objective of this work is to evaluate and compare the revisit-time performance of heterogeneous payloads—including automatic identification system (AIS), electro-optic/infra-red (EO/IR), synthetic aperture radar (SAR), and radio-frequency (RF) sensors—operating over a common region of interest near the Korean Peninsula. To address this problem, we construct a constellation simulati...
Research Paper

Jun 15, 2026

Research on Initial Orbit Determination of Near-Circular Orbit Space Objects Based on the Admissible Region Method

Yewen Yin, Zhenwei Li, Zhe Kang, Wenbo Yang, Jiannan Sun

J. Astron. Space Sci. 2026;43(2):55-70.
https://doi.org/10.5140/JASS.2026.43.2.55

Under space-based angle-only observations, the admissible region (AR) algorithm often yields erroneous solutions in initial orbit determination (IOD) for near-circular orbit objects. This paper analyzes the mechanism generating these erroneous solutions and proposes a suppression method based on screening multi-direction solution sets using dispersion analysis. The study first points out that, under near-circular orbit constraints, the traditional AR algorithm, due to specific relative geometric configurations between the platform and the objec...
Research Paper

Jun 15, 2026

Image-Based Star Detection and Centroid Estimation: Initial Exploration of Lunar Navigation Systems

Anis Hannani Razaman, Yasser Asrul Ahmad

J. Astron. Space Sci. 2026;43(2):71-82.
https://doi.org/10.5140/JASS.2026.43.2.71

Accurate star detection and centroiding are critical for attitude determination in space missions, especially under challenging environments like the lunar surface. This study presents an enhanced centroiding algorithm designed to improve robustness and accuracy in the presence of noise. The method incorporates thresholding and intensity-weighted centroid calculations, optimized through testing on synthetic star images affected by Salt-and-Pepper and Gaussian noise. Validation is conducted via affine transformation and star matching with a know...
Research Paper

Jun 15, 2026

Inter-Hemispheric Comparison of Meteor Decay Time and Its Derived Parameters at 68° Latitudes

Sangadeep Borukote, Chenna Reddy Kammadhanam

J. Astron. Space Sci. 2026;43(2):83-92.
https://doi.org/10.5140/JASS.2026.43.2.83

The decay time of underdense meteor echoes is highly sensitive to background atmospheric conditions in the mesosphere and lower thermosphere (MLT)-region. Using long-term observations from two identical SKiYMET meteor radars located at conjugate polar latitudes, Esrange (68°N, 21°E, 2005–2022) and Rothera (68°S, 68°W, 2005–2024), we examine the inter-hemispheric similarities and differences in meteor decay time and decay time derived atmospheric parameters. The analysis reveals strong hemispheric resemblance in the seasonal evolution ...
Research Paper

Jun 15, 2026

GNSS Analysis of the Ionospheric Response to the Extreme Geomagnetic Storm of May 11, 2024: Latitudinal Dependence of VTEC

Karim Guibula, Abidina Diabate, Moumouni Diallo

J. Astron. Space Sci. 2026;43(2):93-101.
https://doi.org/10.5140/JASS.2026.43.2.93

This study examines the ionospheric response to the extreme geomagnetic storm of May 11, 2024, (Dst ≈ −400 nT) using GNSS derived vertical total electron content (VTEC) from four stations distributed from northern mid-latitudes to southern low latitude. Disturbances are quantified using the relative deviation parameter (ΔVTEC) and interpreted together with GUVI/TIMED thermospheric O/N2 ratio maps. The results highlight a strong latitudinal dependence and a clear spatiotemporal evolution. At northern mid-latitudes, intense and prolonged n...
Technical Paper

Jun 15, 2026

In-Orbit Temperature Calibration of Long-Term Korea Pathfinder Lunar Orbiter Magnetometer Data

Yesun Ahn, Ho Jin, Hyeonhu Park, Yunho Jang, Wooin Jo, Seul-Min Baek, Jehyuck Shin

J. Astron. Space Sci. 2026;43(2):103-116.
https://doi.org/10.5140/JASS.2026.43.2.103

The Korea Pathfinder Lunar Orbiter (KPLO) magnetometer (KMAG) is a triaxial racetrack fluxgate magnetometer with a 1.2-meter-long boom for the KPLO mission. Previous studies on KMAG data processing and calibration have demonstrated that the quality of processed data is sufficient for general scientific research. However, additional calibration is necessary to remove residual noise fields that make it difficult to distinguish small-amplitude signals. As some magnetic interferences induced by the space environment are not fully covered by ground-...

CURRENT ISSUE: Jun 2026, Vol. 43, No. 2

Research Paper Revisit Time Analysis Framework of Low Earth Orbit Constellation for Various Payloads using MATLAB Hongseok Kim, Su-Jin Choi J. Astron. Space Sci. 2026;43(2):35-53. https://doi.org/10.5140/JASS.2026.43.2.35 HTML PDF PubReader	Research Paper Research on Initial Orbit Determination of Near-Circular Orbit Space Objects Based on the Admissible Region Method Yewen Yin, Zhenwei Li, Zhe Kang, Wenbo Yang, Jiannan Sun J. Astron. Space Sci. 2026;43(2):55-70. https://doi.org/10.5140/JASS.2026.43.2.55 HTML PDF PubReader
Research Paper Image-Based Star Detection and Centroid Estimation: Initial Exploration of Lunar Navigation Systems Anis Hannani Razaman, Yasser Asrul Ahmad J. Astron. Space Sci. 2026;43(2):71-82. https://doi.org/10.5140/JASS.2026.43.2.71 HTML PDF PubReader	Research Paper Inter-Hemispheric Comparison of Meteor Decay Time and Its Derived Parameters at 68° Latitudes Sangadeep Borukote, Chenna Reddy Kammadhanam J. Astron. Space Sci. 2026;43(2):83-92. https://doi.org/10.5140/JASS.2026.43.2.83 HTML PDF PubReader
Research Paper GNSS Analysis of the Ionospheric Response to the Extreme Geomagnetic Storm of May 11, 2024: Latitudinal Dependence of VTEC Karim Guibula, Abidina Diabate, Moumouni Diallo J. Astron. Space Sci. 2026;43(2):93-101. https://doi.org/10.5140/JASS.2026.43.2.93 HTML PDF PubReader	Technical Paper In-Orbit Temperature Calibration of Long-Term Korea Pathfinder Lunar Orbiter Magnetometer Data Yesun Ahn, Ho Jin, Hyeonhu Park, Yunho Jang, Wooin Jo, Seul-Min Baek, Jehyuck Shin J. Astron. Space Sci. 2026;43(2):103-116. https://doi.org/10.5140/JASS.2026.43.2.103 HTML PDF PubReader

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