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Reconstructing the cruise-phase trajectory of deep-space probes in a general relativistic framework: An application to the Cassini gravitational wave experiment
Barriot, Jean-Pierre; O'Leary, Joseph
Einstein's theory of general relativity is playing an increasingly important role in fields such as interplanetary navigation, astrometry, and metrology. Modern spacecraft and interplanetary probe prediction and estimation platforms employ a perturbed Newtonian framework, supplemented with the Einstein-Infeld-Hoffmann n-body equations of motion. W…
New atomic data for C I Rydberg states compared with solar UV spectra
Del Zanna, G.; Storey, P. J.; Dufresne, R. P.
We use the Breit-Pauli R-matrix method to calculate accurate energies and radiative data for states in C I up to n = 30 and with l ≤ 3. We provide the full data set of decays to the five 2s2 2p2 ground configuration states 3P0,1,2, 1D2, and 1S0. This is the fir…
The Influence of Oxygen Ions on the Formation of a Thin Current Sheet in the Magnetotail
Malova, H. V.; Popov, V. Yu.; Zelenyi, L. M. +2 more
A thin current sheet in the Earth's magnetotail with characteristic thickness of one to several proton gyroradii is often observed during magnetospheric disturbances named substorms, when a relatively thick current configuration in the magnetotail is narrowed to an extremely small thickness and then can spontaneously be destroyed. The current-shee…
Sub-Auroral Flows and Associated Magnetospheric and Ionospheric Phenomena Developed During 7-8 September 2017
Horvath, Ildiko; Lovell, Brian C.
This study investigates the Sub-Auroral Polarization Streams (SAPS) and Sub-Auroral Ion Drifts (SAID) along with the associated magnetospheric and ionospheric phenomena developed during 7-8 September 2017. Then, a series of substorms occurred before and during the geomagnetic storm (SYM-Hmin = -146 nT). Results are obtained by utilizing…
The Pleiades flare stars in the Gaia era
Ghazaryan, S.; Hambaryan, V.; Hambardzumyan, L. +3 more
We study the six-dimensional arrangement of flare stars in the Pleiades cluster region using the third release of the Gaia–mission (Gaia DR3) and we provide preliminary, a new, original view of the spatial configuration of the flare "star-members" of the cluster.
Generating a unified catalogue of open clusters and their most probable members
Perren, G. I.; Pera, M. S.; Navone, H. D. +1 more
In this work we present the largest database of open clusters catalogued to date. To obtain it we combine almost a dozen existing databases of open clusters to generate a cross-matched list of more than 5000 unique objects, scattered throughout the Galaxy. In addition, we process around 2000 of these clusters with a new membership algorithm code; …
Chemical characterisation of the X-shooter Spectral Library (XSL): [Mg/Fe] and [Ca/Fe] abundances
Palicio, P. A.; Vazdekis, A.; Sánchez-Blázquez, P. +1 more
Context. The X-shooter Spectral Library (XSL) is a large empirical stellar library used as a benchmark for the development of stellar population models. The inclusion of α-element abundances is crucial to disentangling the chemical evolution of any stellar system.
Aims: The aim of this paper is to provide a catalogue of high-precision, accura…
A Surrogate Model for Studying Solar Energetic Particle Transport and the Seed Population
Schwadron, Nathan A.; Baydin, Atilim Guneş; Poduval, Bala
The high energy particles originating from the Sun, known as solar energetic particles (SEPs), contribute significantly to the space radiation environment, posing serious threats to astronauts and scientific instruments on board spacecraft. The mechanism that accelerates the SEPs to the observed energy ranges, their transport in the inner heliosph…
Markov Chain Monte Carlo Optimization applied to Dysonís Visual Double Stars
Budding, E.; Banks, T.; Si, I. S. X. +1 more
Estimates of orbital parameters were made using a Bayesian optimization technique on astrometric data for 25 visual binary systems catalogued a century ago by the ninth Astronomer Royal, Sir Frank Dyson. An advantage of this method is that it provides reliable, unbiased uncertainty estimates for the optimized parameters. Reasonable agreement is fo…
The second Venus flyby of BepiColombo mission reveals stable atmosphere over decades
Haus, Rainer; Arnold, Gabriele; Hiesinger, Harald +4 more
Studies of the Venusian mesosphere provide important information about the current state of the entire Venusian atmosphere. This includes information about the dense cloud structure, its vertical thermal profile, temperature fields, and the resulting dynamical and meteorological processes that contribute to a deeper understanding of the climatolog…