Results 71 to 80 of about 30,911 (193)

Reassessing the Relationship Between Meteor Radio Afterglows and Optical Persistent Trains

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Meteor radio afterglows (MRAs) and optical persistent trains (PTs) are two types of long‐lived phenomena which are occasionally observed following the occurrence of a meteor. Both phenomena are thought to be produced by intrinsic emission mechanisms; PTs have been associated with chemiluminescent reactions between meteoric metals and ...
L. E. Cordonnier, K. S. Obenberger, G. B. Taylor, J. M. Holmes, J. Dowell, D. Vida   +5 more
wiley   +1 more source

The GAPS programme at TNG

Astronomy & Astrophysics
Context. The transition regime between giant planets (GPs) and brown dwarfs (BDs) is still an open subject of study in exoplanetary science. A complete understanding of the population of long-period GPs and BDs would be pivotal for improving our ...
Pinamonti M., Sozzetti A., Barbato D., Desidera S., Biazzo K., Bonomo A. S., Lanza A. F., Naponiello L., Affer L., Anche R. M., Andreuzzi G., Basilicata M., Brinjikji M., Brogi M., Cabona L., Carolo E., Colombo S., Damasso M., D’Arpa M., Di Filippo S., Harutyunyan A., Hom J., Mancini L., Mantovan G., Nardiello D., Santhakumari K. K. R., Zingales T.   +26 more
doaj   +1 more source

Improved astrometry for the Bohannan & Epps catalogue

, 2012
Aims: Accurate astrometry is required to reliably cross-match 20th-century catalogues against 21st-century surveys. The present work aims to provide such astrometry for the 625 entries of the Bohannan & Epps (BE74) catalogue of H$\alpha$ emission-line ...
Howarth, Ian D.
core   +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

Observational Data and Orbits of the Asteroids Discovered at the Baldone Observatory in 2008–2013

Open Astronomy, 2015
The paper presents statistics of the asteroids observed and discovered at the Baldone Observatory, Latvia, in 2008–2013 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets. CCD observations
Černis K., Wlodarczyk I., Eglitis I.
doaj   +1 more source

Speckle Observations With PISCO in Calern (France): II. Astrometric Measurements of Visual Double Stars in 2017–2018 and New or Revised Orbits for A1913 AB, A1710, COU1394, BU1185, A122, A570, HU577, COU812, HU332, A2095 AB, and A884

Astronomische Nachrichten, Volume 346, Issue 6, July 2025.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2017–2018 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain.
M. Scardia, J.‐L. Prieur, J.‐P. Rivet, D. Vernet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini   +11 more
wiley   +1 more source

Differential Astrometry over 15 degrees

, 1998
We observed the pair of radio sources 1150+812 and 1803+784 in November 1993 with a VLBI array, simultaneously recording at 8.4 and 2.3 GHz. We determined the angular separation between the two sources with submilliarcsecond accuracy by using ...
Guirado, J. C., Marcaide, J. M., Perez-Torres, M. A., Ros, E.   +3 more
core   +1 more source

Uncertainties in Ground‐Based Visual Double Star Measures—II Accuracy of Measures

Astronomische Nachrichten, Volume 346, Issue 6, July 2025.
ABSTRACT Letchford and White 2025, Paper I, determined the uncertainties in ground‐based historic measures of double stars. In this paper, the accuracy of 26,205 ground‐based measures of 857 visual double stars, made since ∼$$ \sim $$1780, is determined relative to space‐based measures based on positions and proper motion from the HIPPARCOS (via ASCC ...
Graeme L. White, Roderick R. Letchford
wiley   +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

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source