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Dr Andras Szell (AdCoelum Space Research and Consulting LLC)01/07/2026, 10:00Talk
Spacecraft attitude determination from passive optical observations remains a challenging inverse problem, particularly for resident space objects lacking cooperative sensors or telemetry. This work presents a methodology for reconstructing rotational state information from multi-colour photometric light curves by combining physically based brightness modelling, spectral reflectance effects,...
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Radu Gabriel Danescu (Technical University of Cluj-Napoca)01/07/2026, 10:30Talk
Small objects in the Low Earth Orbit pose unique challenges for tracking, as they are too faint for producing the well-identifiable streaks in images acquired in sidereal tracking mode. The solution is to use the optical instrument in object tracking mode. A particular property of the LEO objects is their high speed, which demands small camera exposure times. Even so, the background stars will...
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Gabriela Blaga (Astronomical Institute, Romanian Academy, Cluj-Napoca Branch)01/07/2026, 11:00Talk
The thermoelectric generation of magnetic fields due to temperature gradients in electrically conductive spacecraft materials presents a challenge for missions requiring high-precision magnetic field measurements. A tool is needed at the design phase to model, predict and mitigate these perturbations.
Building this tool requires a comprehensive multiphysics approach, combining thermal,...
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Cristian Omat (Astronomical Institute of the Romanian Academy)01/07/2026, 12:00Talk
Space Situational Awareness (SSA) has emerged as a critical priority in the modern space era, driven by the rapid growth of satellite deployments into Low Earth Orbit (LEO). While mega-constellations expand global connectivity, they also intensify orbital congestion and amplify operational risks, challenges further compounded by the increasing involvement of commercial actors and a regulatory...
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Ana-Maria Bîzgă (Technical University of Cluj-Napoca)01/07/2026, 12:30Talk
Abstract — Modern astronomical observations generate large amounts of image data, increasing the need for automated methods capable of detecting and identifying celestial objects. This paper presents a software application designed for the analysis of astronomical images, combining image processing techniques with astronomical reference data. The developed pipeline performs automatic object...
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Zsófia Oltvári (University of Szeged)01/07/2026, 13:00Talk
The coordinates of the bright radio-loud active galactic nucleus (AGN) J1438+6211 (1437+624) at redshift z=1.094 are known in optical and radio wavebands with sub-milliarcsecond precision. The target shows significant offset, in the order of ~10 milliarcseconds, between its optical and radio positions. I analysed very long baseline interferometry (VLBI) radio images obtained at 5 GHz with the...
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Tiberiu Harko (Babes-Bolyai University)01/07/2026, 15:30Talk
We consider the implications of the extension's of Newton's law of
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gravitation as proposed in the framework of the Bolyai-Lobachevski hyperbolic geometry. In particular, we focus on the negatively-curved hyperbolic space, $H^3$, and we investigate the generalisations of Newton's inverse-square law of the gravitational force in this geometry, its properties, and its physical implications. We... -
Tania Flavia Ciceo (Babeș-Bolyai University, Faculty of Physics)01/07/2026, 16:00Talk
A bare strange star is bounded by a thin electron layer, the electrosphere, whose overcritical field produces electron–positron pairs through the Schwinger mechanism. We re-examine this by integrating the relativistic Vlasov–Maxwell system, with a Schwinger pair-production source and the full two-current field equation, on a finite-temperature electrosphere background. We show that the surface...
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Cristian Croitoru (Technical University of Cluj Napoca)01/07/2026, 16:30Talk
Detecting faint, linear satellite streaks in astronomical images is challenging due to high sensor dynamic range, stellar clutter, and atmospheric noise. Standard global normalization techniques often cause information loss by drowning these weak features in the background noise. To compensate for this, we propose a feature engineering pipeline that transforms raw FITS data into a...
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Mr Cristian Danescu (Astronomical Institute of Romanian Academy)01/07/2026, 17:30Talk
T Coronae Borealis is a recurrent nova system that erupts approximately every 80 years. Given that the last outburst occurred in 1946 and recent unusual activity, including a "pre-eruption dip" similar to that seen before the previous event, a new eruption is thought to be imminent, sparking intense interest. We present recent photometry and spectroscopy covering this dip and the subsequent...
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Prof. Tamás Borkovits (Baja Astronomical Observatory of Szeged University & HUN-REN-SZTE Stellar Research Group)01/07/2026, 18:00Talk
Hierarchical multiple stellar systems with short outer periods comprise an important subgroup of multiple star systems. In this paper we present the discovery and spectro-photodynamical analysis of the most compact known 3+1 quadruple stellar system, TIC 120362137. Through investigations of the observations made with the TESS satellite and ground-based follow up measurements, we find that the...
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Mr Cristian Danescu (Astronomical Institute of Romanian Academy)01/07/2026, 18:30Talk
In this study, we analyzed the structural and magnetic evolution of the active region NOAA 14366, using the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO). The region was visible on the solar disk between January 31 and February 11, 2026. Characterized by an compact β-γ-δ magnetic configuration, it has produced a large number of major solar flares (6...
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Balázs Cirok (University of Szeged)02/07/2026, 10:00Talk
The expanding catalog of gravitational wave detections enables novel tests of General Relativity, including probes of waveform polarization content. Many polarization studies rely on null stream methods, neglecting the known non-stationary and non-Gaussian features of detector noise. Using simulations, we quantify how this noise idealization affects inferences of non‑tensorial polarization...
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Richárd Tamás Varga (University of Szeged)02/07/2026, 10:30Talk
We analyzed supermassive black hole binary (SMBHB) candidate systems whose parameters were constrained by electromagnetic surveys. We extracted data from the following catalogs: the Catalina Real-Time Transient Survey (CRTS), the Palomar Transient Factory (PTF), Pan-STARRS, and the Zwicky Transient Facility (ZTF). Based on these data, we estimated the characteristic strain and frequency of the...
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Teodora Matei (Babes-Bolyai University, Cluj-Napoca)02/07/2026, 11:00Talk
In recent years, the $\Lambda$CDM model has proven insufficient to fully explain the mysteries of our Universe. The emergence of a dark energy component in the early Universe has motivated a variety of frameworks aimed at closing the gap between early and late-time cosmological observations. Early Dark Energy models may alleviate existing tensions by proposing varying equations of state that...
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Alexandru Pop (Astronomical Institute of the Romanian Academy, Astronomical Observatory Cluj-Napoca)02/07/2026, 12:00Talk
The detection of exoplanets using radial velocity (RV) data frequently proved to be a difficult task. It requires the disentangling the periodic planetary signal(s) and the quasi-periodic stellar signal which often is the dominant one. An interesting situation inspired by our recent reanalysis of the RV data on TOI-837 is illustrated using synthetic data. The planetary signal is modeled by a...
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Dr Maria Craciun (Tiberiu Popoviciu Institute of Numerical Analysis, Romanian Academy)02/07/2026, 12:30Talk
Separating periodic, quasi-periodic, and stochastic signals out of noisy, irregularly sampled time series is a central problem of time-domain astronomy. It is of particular interest in the problem of extra solar planets. In the analysis of observational data the three regimes are easily confused once time gaps and colored noise distort their spectra. This talk focuses on the quasi-periodic...
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Sorin Ion (Observatoire de Paris)02/07/2026, 13:00Talk
We present the partial results of a study conducted within the NEOPOPS project [1], the taxonomic classification [2] of 47 near-Earth asteroids (NEAs) through a probabilistic clustering method developed by Max Mahlke and collaborators [3].
Broadband photometry B, V, R, and I of several NEAs obtained during 2025–2026 with the 1.2 m telescope at Observatoire de Haute Provence (France) was...
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Tegze Tordai (Department of Theoretical Physics, University of Szeged, Hungary)02/07/2026, 15:30Talk
Modelling light-signals as shockwaves - that is, discontinuities in the first derivative of the Faraday-tensor - propagating through space-time results in a light cone condition defining the characteristic hypersurfaces of propagation. In non-linear electrodynamics, these can be given as null cones of an effective metric generally differing from the background metric representing gravity....
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Ms Kata Karácsonyi (University of Szeged)02/07/2026, 16:00Talk
The observation of gravitational waves has opened new possibilities for testing theories of gravity. In scalar–tensor theories, additional breathing and longitudinal scalar polarizations are predicted alongside the plus and cross tensor modes. Scalar gravitational radiation appears one post-Newtonian order earlier than the quadrupolar tensor radiation, allowing the scalar polarization to be...
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László Árpád Gergely (HUN-REN Wigner RCP)02/07/2026, 16:30Talk
Gravity theories in which the metric tensor is complemented by a minimally coupled kinetic gravity braiding type scalar field obey all present observational constraints. The k-essence part of the scalar field is either equivalent to a perfect fluid (when the scalar gradient is timelike), an inhomogeneous type I fluid with tangential pressures equal to minus its energy density (for spacelike...
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Zoltán Keresztes (University of Szeged, Hungary)02/07/2026, 17:30Talk
We introduce a model which generalizes the Einstein–Cartan–Dirac theory, including local phase invariance of the spinor field supported by a gauge scalar field and certain couplings to the torsion. A natural gauge choice reduces the field equations to that of the Einstein–Dirac theory with a Dirac field potential that has polar and axial spinor currents. We identify a new potential term...
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Bence Juhász02/07/2026, 18:00Talk
We extend our previous investigation of the canonical description of Dirac and Schrödinger systems for the massive Rarita–Schwinger system, the vector-valued spinor theory describing spin-3/2 fields. We simplify the Lagrangian and Hamiltonian descriptions by introducing a modified time derivative. We discuss both the simplest and the Hermitian Lagrangians, which differ by a total divergence....
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Muhammad Ghulam Khuwajah Khan (Indian Institute of Technology, Jodhpur)02/07/2026, 18:30Talk
The microscopic identity of dark matter and the smallness of the observed
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vacuum energy remain two central puzzles in cosmology. I present a framework in which both questions are tied to a single additional gauge sector. In four spacetime dimensions, a three-form gauge field has a four-form field strength with no local propagating degrees of freedom. Instead, it labels distinct vacuum-energy... -
Himanshu Chaudhary (Universitatea Babeș-Bolyai din Cluj-Napoca)03/07/2026, 09:30Talk
The $\Lambda$CDM model has long been regarded as the standard paradigm of modern cosmology, providing an excellent description of the Universe across a wide range of observations, from the cosmic microwave background to large-scale structure formation and Type Ia supernovae. The discovery of the accelerated expansion of the Universe further established dark energy as one of the central...
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C.S. Leung (Hong Kong Astronomical Society)03/07/2026, 10:00Talk
In this paper, we presents a technical assessment of an observational event capturing the lunar occultation of Sgr A* on 12th of March 2026, by using the Italian Primalucelab SPIDER 300A radio telescope in Hong Kong. Within the four hours observation window, a 2D On-The-Fly (OTF) mapping technique was sequentially applied to generate a time series of 12 radio images at the 21cm wavelength. The...
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Andreea-Catalina Pop (University of Bucharest - Doctoral School of Physics)03/07/2026, 10:30Talk
This paper presents preliminary results obtained from simultaneous optical observations of the geostationary object Jam E Jam using the Berthelot and SkEYE telescopes located in Romania. The experimental campaign validated the feasibility of dual-station astrometric observations and demonstrated the potential of distributed optical systems for monitoring Resident Space Objects (RSOs) in the...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)03/07/2026, 11:30Talk
Abstract: The Exo4Edu Romania initiative is a component of the Exo4Edu Erasmus+ project[1,2], collaborating with three additional countries: France, Portugal, and Albania. The project is leaded by Paris Observatory, France. The project provides easily comprehensible information regarding exoplanets and the search for extraterrestrial life in the Universe, also available in the Romanian...
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Dana Ficut-Vicas (Astronomical Observatory Cluj-Napoca, Romanian Academy Cluj Branch)03/07/2026, 12:00Talk
In the context of Romania joining the OCDE is of outmost importance to consider aligning the educational knowledge content with the literacy standards worldwide in all disciplines including astronomy. At the international level the astronomy literacy standards have been defined by Russo et. al. 2019 and within the IAU Astronomy Education Office assessment instruments of astronomy concept...
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Mirel Birlan (Astronomical Institute of the Romanian Academy)03/07/2026, 12:30Talk
Mirel Birlan1, Alin Nedelcu1, Vlad Turcu1,2, Adrian Sonka1, Octavian Blagoi1, Simon Anghel1, Madalina Trelia1,3, Cristian Omat1, Octavian Badescu1, Petre Paraschiv1, Catalina Pop3,4, Dan Moldovan2, Diana Ionescu1, Cristian Danescu1, Nicu Dociu1, Liviu Ghergu1
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1 Astronomical Institute of the Romanian Academy
2 Cluj Napoca Astronomical Observatory
3 Ministry of Defense, Space and... -
Dr Mihai BarbosuPoster
Abstract
This work presents an analysis and prediction for orbital elements of the Jason-3 satellite, based on precise optical observations. Using a combination of orbit determination techniques and numerical propagation methods, we examine the Keplerian and osculating orbital elements of Jason-3, with particular attention to perturbations arising from Earth's non-spherical gravitational...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)Poster
The construction of a sundial represents a practical application of celestial mechanics, converting the perceived movement of the Sun into a measurement of local time. The precision of a sundial is contingent upon a comprehensive understanding of the Earth's rotation, the tilt of its axis, and the principles of its orbital mechanics. For example, the equation of time is derived from two...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)Poster
The Vinča symbols may hold potential astronomical significance, as they represent a form of communication that transcends written language. Interpreting these Neolithic signs poses challenges due to their multifaceted meanings, which can vary based on the observer's perspective. During the Neolithic period, the transition to a sedentary lifestyle, driven by agriculture and animal husbandry,...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)Poster
The applications of artificial intelligence (AI) in the realm of astronomy have experienced a remarkable increase in recent years, driven by the exponential growth of data generated from various sources such as telescopes, satellites, and complex simulations. This surge in data presents a significant challenge for astronomers, as the sheer volume often exceeds the capacity for manual analysis....
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Dana Ficut-Vicas (Astronomical Observatory Cluj-Napoca, Romanian Academy Cluj Branch)Poster
The advancements of software and technology allow inedite perspectives in science. Crossing from one set of methods to another cannot only increase accessibility and traceability of research but also allow further refinement of both sets of methods. We have been originally working with the IDL software in our Star Formation (SF) analysis and we know look into the advantages and the limitations...
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Dr Tibor Hegedüs (Baja Observatory of the University of Szeged)Poster
The very first new Hungarian satellite tracking optical device after closing all optical satellite observations about 35 years ago – is the PAN-8 sensor at Baja, developed and installed by Sybilla Technologies Spólka z.o.o. (Bydgoszcz, Poland). During the EON project (2021-2025) funded by ESA, optical “white light” observations were performed in the course of 2024-2025, around on 219 nights...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)Poster
With the renewed focus on lunar exploration through NASA's Artemis program, there is a growing need for effective methods to calculate trajectories in the complex multi-body gravitational field around the Moon. The restricted four-body problem, particularly with the Sun, Earth, Moon, and a spacecraft, presents significant challenges due to non-autonomous characteristics and singularities from...
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Dr Diana Rodica RADNEF-CONSTANTIN (Institutul Astronomic al Academiei Romane)Poster
In the case of H I spectrum, for large principal quantum numbers n corresponding to the so-called Rydberg states, measurement accuracy becomes increasingly limited by thermal agitation in the mid-infrared region (wave lengths above 10µm), coinciding with the resonance region of molecular vibrational modes.
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Starting from the quantum model of the Hydrogen atom, we calculate and tabulate the... -
Vlad Turcu (Academia Romana Filiala Cluj-Napoca, Observatorul Astronomic Cluj-Napoca; Institutul Astronomic al Academiei Romane)Poster
The Romanian CubeSat 1U satellite “EMISAR” (NORAD ID: #68427U, International Designator ID: 2026-067M), which was successfully launched in march 30th 2026, gave the motivation for taking on the challenge of observing with optical SST sensors of Astronomical Observatory Cluj-Napoca – Feleacu Station. We present the observations made during several observing sessions in the interval 19th April...
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Gabriela Blaga (Astronomical Institute, Romanian Academy, Cluj-Napoca Branch)Poster
The theoretical interpretation of electromagnetic radiation and transport of charged particles in Brownian Motion is complicated by the existence of multiple physical regimes, model assumptions, and observational diagnostics that are often treated separately. Although substantial progress has been made in individual subproblems, the field lacks a unified structure that organizes the full space...
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Dr Tibor Hegedüs (Baja Observatory of the University of Szeged, Hungarian Meteoritical Society (MMT))Poster
By the personal efforts and investment of some of the present authors, an independent 6-sites allsky7 camera system were established and integrated into the Worldwide allsky7 system (AMS) in 2021 by the Hungarian Meteoritical Society. The autonomous stations maintained and operated by the owners of each given sites, while the daily operation and continuous inspection is coordinated by one of...
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Dr Iharka Csillik (Romanian Academy. Astronomical Institute. Cluj-Napoca Astronomical Observatory)Poster
The predictability of reentries of artificial satellites has seen considerable enhancement in recent years. The Cluster-II space mission, conducted by the ESA with participation from NASA, consists of four identical cylindrical satellites operating in a tetrahedral formation and following a highly elliptical orbit. The Salsa satellite re-entered the atmosphere on 8 September 2024, while Rumba...
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