Results 51 to 60 of about 10,210 (220)

Galactic astrometry with Gaia [PDF]

Gaia space mission of the European Space Agency was launched at the end of 2013 and will continue operations until 2025. The published data releases revolutionize the view of the Milky Way galaxy and beyond thanks to its unprecedented astrometry ...
Jordi i Nebot, Carme
core   +1 more source

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

Payload Selection Scheme for a Fast‐Response Planetary Defense Scouting Mission: The Satis CubeSat Study

Advances in Astronomy, Volume 2026, Issue 1, 2026.
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 asteroid potentially impacting the Earth in the near future ...
Markus Patzek, Birgit Ritter, Carsten Güttler, Moritz Goldmann, Özgür Karatekin, Detlef Koschny, Richard Moissl, Valerio Fogliano, Francisco Cabral, Roger Walker, Bastian Gundlach, Michael Kueppers   +11 more
wiley   +1 more source

Constraining the size, shape, and albedo of the large trans-Neptunian object (28978) Ixion with multi-chord stellar occultations

Astronomy & Astrophysics
Context. Trans-Neptunian objects (TNOs) are among the most primitive remnants of the early Solar System. Determining their sizes, shapes, albedos, and surface properties is essential for understanding their origin and evolution.
Kilic Y., Braga-Ribas F., Pereira C. L., Ortiz J. L., Sicardy B., Santos-Sanz P., Erece O., Rizos J. L., Gómez-Limón J. M., Margoti G., Souami D., Morgado B., Gomes-Junior A., Catani L. M., Desmars J., Kretlow M., Rommel F., Duffard R., Alvarez-Candal A., Camargo J. I. B., Kaplan M., Morales N., Herald D., Assafin M., Benedetti-Rossi G., Sfair R., Savalle R., Arcas-Silva J., Bernasconi L., Blank T., Bonavita M., Carlson N., Christophe B., Colesanti C. A., Collins M., Columba G., Dunford R., Dunham D. W., Dunham J., Emilio M., Ferrante W. G., George T., Hanna W., Isopi G., Jones R., Kenyon D. A., Kerr S., Kouprianov V., Maley P. D., Mallia F., Mattei J., Meunier M., Napoleao T., Peixoto V. F., Pollock J., Snodgrass C., Stechina A., Thomas W., Venable R., Viscome G. R., Zapparata A., Bardecker J., Castro N., Cebral C., Chapman A., Gao C., Green K., Guimaraes A., Jacques C., Jehin E., Konishi M., Leiva R., Liberato L., Magliano C., Mammana L. A., Melita M., Moura V., Olivera-Cuello Y., Peiro L., Spagnotto J., Stuart P. C., Vanzi L., Wilberger A., Malacarne M.   +83 more
doaj   +1 more source

Improvements by Space Astrometry

, 1978
Technical note written as input to the early studies of the ESA space astrometry project ...
Lindegren, Lennart
core   +1 more source

Dynamics of the December 2020 Ash‐Poor Plume Formed by Lava‐Water Interaction at the Summit of Kīlauea Volcano, Hawaiʻi

Geochemistry, Geophysics, Geosystems, 2023
On 20 December 2020, after more than 2 years of quiescence at Kīlauea Volcano, Hawaiʻi, renewed volcanic activity in the summit crater caused boiling of the water lake over a period of ∼90 min. The resulting water‐rich, electrified plume rose to 11–13 km
Ryan C. Cahalan, Larry G. Mastin, Alexa R. VanEaton, Shaul Hurwitz, Adam B. Smith, Josef Dufek, Stephen A. Solovitz, Matt Patrick, Johanne Schmith, Carolyn Parcheta, Weston A. Thelen, Drew T. Downs   +11 more
doaj   +1 more source

FinalKAN: A Dual‐Stream KAN Network Integrating Multisource Features for Radio Telescope Pointing Correction

Advances in Astronomy, Volume 2026, Issue 1, 2026.
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 nonlinear errors induced by temperature, wind speed, and
Yao He, Longfei Hao, Wei Dai, Fernando Aguado Agelet   +3 more
wiley   +1 more source

A Bayesian framework for astrometry in a sparse star field and its application to Triton observations

Astronomy & Astrophysics
Context. The Gaia DR3 catalog significantly improves ground-based astrometric precision for natural satellites, largely because sufficient reference stars with high-precision positions are typically available within an object’s field.
Fang X. Q., Peng Q. Y., Lu X., Lin H., Zheng Z. J.   +4 more
doaj   +1 more source

Astrometry with Small Telescopes [PDF]

Symposium - International Astronomical Union, 1986
At the Quonochontaug Observatory of the University of Rhode Island, we specialize in the development of simple seeing limited optical telescopes. Our main instrument is a heavy Serrier trussed f/10.7, .4-m astrometric reflector which provided the last-minute astrometry in the successful prediction of the occultation of SAO 120774 by Herculina in 1978 ...
openaire   +1 more source

Results of the astrometry and direct imaging testbed for exoplanet detection

, 2017
Measuring masses of long-period planets around F, G, and K stars is necessary to characterize exoplanets and assess their habitability. Imaging stellar astrometry offers a unique opportunity to solve radial velocity system inclination ambiguity and ...
Rodack, Alexander, Pluzhnik, Eugene A., Olivier Guyon, Milster, Thomas, Finan, Emily, Eugene A. Pluzhnik, Alexander Rodack, Eduardo A. Bendek, Belikov, Ruslan, Thomas Milster, Emily Finan, Justin Knight, Ruslan Belikov, Knight, Justin, Lee Johnson, Guyon, Olivier, Johnson, Lee, Bendek, Eduardo A.   +17 more
core   +1 more source