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Advances in Astronomy
Scopus
ISSN 1687-7977 · Wiley · 405 artikel di indeks
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Artikel Jurnal
FinalKAN: A Dual-Stream KAN Network Integrating Multisource Features for Radio Telescope Pointing Correction
This paper investigates the degradation of pointing accuracy in the Kunming 40-m radio telescope due to long-term equipment aging and environmental disturbances. Conventional linear pointing models are constrained by their linear modeling framework, making it difficult to accurately represent the…
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Artikel Jurnal
Momentum Transfer Coefficient Constraints for the 2024 PDC25 Hypothetical Asteroid Impact Scenario
In Epoch 2 of the 2024 PDC25 Hypothetical Asteroid Impact Scenario, an asteroid is confirmed to be on a collision course with the Earth, and its size and surface composition have been well characterized via a flyby mission. A kinetic impactor deflection strategy is the most technologically mature…
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Artikel Jurnal
NEOMIR: ESA’s Space-Based Infrared Mission for NEO Detection and Early Warning
The Near-Earth Object Mission in the Infrared (NEOMIR) is European Space Agency’s (ESA’s) space-based mission dedicated to discovering near-Earth objects (NEOs). Its primary goal is to detect and provide early warnings for NEOs approaching Earth approaching from the near-Sun direction, which are…
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Dynamical Dark Sector: A Joint Two-Scalar-Field Model for Dark Matter and Quintessence
The physical nature of dark matter and dark energy remains one of the most pressing questions in modern cosmology. This work presents a phenomenological model where the entire dark sector is described by two minimally coupled scalar fields within general relativity. The first, an ultra-light scalar…
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Gravitational Time Potential Energy
We extend the Einstein equivalence principle via a supplementary local energy equivalence postulate and propose the gravitational time potential energy (GTP) framework: a time-dimensional scalar potential accumulating continuously with the proper duration of gravitational action. This framework may…
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Rotation Curves of Galaxies: A New Theoretical Approach and Comparison With Observations
Observational results on the rotation curve of a rotating galaxy are used in thought experiments. A binary system is inserted in the galaxy, and equations for radial accelerations of the two bodies are found. Similarly, a single body is inserted in a multicomponent galaxy, and an equation for…
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Constraint-Aware Operating-Point Selection for FAST Pulsar Candidate Screening
FAST pulsar surveys generate candidate volumes that make manual review a practical bottleneck, so fixed-threshold classification is often mismatched to deployment under limited review budgets. We formulate candidate screening as a constrained operating-point selection problem: given model scores…
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Artikel Jurnal
Payload Selection Scheme for a Fast-Response Planetary Defense Scouting Mission: The Satis CubeSat Study
The continued detection of near-Earth asteroids with postulated close encounters with Earth is a clear motivation for planetary defense–driven mission designs. Fast reconnaissance in an imminent threat scenario (i.e., less than a few years upon impact) is crucial to gain information about an…
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A Unified Optimization Framework for LEO Hybrid Constellations Using an Improved Continuous Coefficient Method
Low Earth orbit (LEO) constellations are increasingly deployed to provide integrated services such as communication, navigation augmentation, and remote sensing. However, traditional constellation designs—such as Walker, streets-of-coverage (SoC), and Flower constellations—rely on distinct…
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Testing the Weak Cosmic Censorship Conjecture via Test Particle–Induced Overcharging/Overspinning of Kerr–Newman–Modified Gravity Black Hole
We examine the weak cosmic censorship conjecture (WCCC) violation by throwing a charged and rotating test particle into a Kerr–Newman–modified gravity black hole (KN–MOG BH). The result depends on several factors, such as the relative sign of the particle’s charge and its direction of rotation with…
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Artikel Jurnal
Multi-Objective Optimization of Cislunar Navigation Constellations and Mission Validation for Lunar Re-Exploration
To address the limitations of traditional navigation systems in lunar exploration missions regarding positioning accuracy and coverage, this study proposes a multi-objective optimization framework for the Lunar Navigation Satellite System (LNSS) to support the lunar re-exploration mission. A…
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Size Distribution of Boulders in the Subsurface Layer of Asteroid Dimorphos Revealed by the Ejecta Pattern Observed in the DART Exploration
We analyze the pattern observed in the ejecta curtain induced by hypervelocity impact to investigate the dependence of the pattern on the size distributions of target particles. When target particles have a similar size, the characteristic size of the patterns is smaller than the size of the entire…
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Artikel Jurnal
Ionospheric TEC Forecast Using Bi-LSTM With the Adam Optimizer During X-Class Solar Flares Occurred in the Year 2024 and Validation With IRI-2020
Satellite communication and navigation systems have become more essential to everyday life, but at the same time, understanding the effect of solar activity on these systems is vital. Total electron content (TEC) is a key factor affecting satellite signals. Solar flares affect the TEC variations…
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Artikel Jurnal
Analysis of Seismic Ionospheric Effects and Prediction of TEC During Earthquakes Occurred in Indonesia Based on GPS Data
Total electron content (TEC), which quantifies the quantity of free electrons in the Earth’s ionosphere, is a crucial parameter that experiences discrepancies during seismic events. This study investigates the potential of utilizing TEC prediction at the BAKO position in Indonesia during…
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Radio Frequency Interference Detection Using Swin Transformer Embedding U2-Net
Radio frequency interference (RFI) is radio wave interference from natural sources or man-made models. In radio astronomy research, the signals of celestial objects captured by radio telescopes are extremely weak, and the presence of RFI can significantly mask or distort those signals, reducing the…
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Artikel Jurnal
A Satellite Drift Scan Approach for Establishing the Pointing Model of Radio Telescopes
In the era of large satellite constellations, there are more than 1000 satellites in orbit. While the signals from these satellites may pose a risk of radio frequency interference (RFI) to radio telescopes, they also present a potential advantage by serving as high-spatial-density pointing…
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Artikel Jurnal
Preimpact Detection of Chelyabinsk-Type Objects in the Thermal Infrared: Possibilities and Limitations
The Chelyabinsk meteor entered Earth’s atmosphere on 15 February 2013, producing a shock wave that injured about 1500 people and damaged thousands of buildings. Despite its relatively large size (∼20 m), the progenitor asteroid approached Earth undetected. Its apparent radiant was too close to the…
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Full-Waveform Simulation of Infrasound Propagation in the Atmosphere: A Case Study of the 2023 April 20 SpaceX Starship Explosion
Infrasound, low-frequency sound below 20 Hz, has been a key technology to monitor explosion events in the atmosphere. The International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty Organization provides the means for continuous monitoring of infrasonic events worldwide…
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Forecasting the Timing of Peak Solar Flare Index in Solar Cycle 25 for Improved Space Weather Prediction
Solar flares, driven by magnetic reconnection on the Sun, pose substantial threats to Earth’s technological infrastructure. Accurate forecasting of flare activity, quantified by the Solar Flare Index (SFI), is crucial for mitigating space weather risks. This study leveraged an optimized long…
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Weather Radar Detection and Analysis of Bolides in the Day or Night
Weather radars have proven to be valuable tools for detection and analysis of meteorite falls, specifically identifying and analyzing falling meteorites which have survived the initial fireball. The NEXRAD system has been in operation since the late 1990s by the United States National Oceanic and…