Results 101 to 110 of about 41,651 (296)

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar‐Julià, Francesca Figueras   +5 more
wiley   +1 more source

The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet β Pictoris b from Combined Direct Imaging and Astrometry [PDF]

Astronomical Journal, 2019
We present new observations of the planet β Pictoris b from 2018 with the Gemini Planet Imager (GPI), the first GPI observations following conjunction.
E. Nielsen, R. J. Rosa, J. Wang, J. Sahlmann, P. Kalas, P. Kalas, P. Kalas, G. Duchêne, J. Rameau, M. Marley, D. Saumon, B. Macintosh, M. Millar-Blanchaer, M. Nguyen, S. Ammons, V. Bailey, T. Barman, J. Bulger, J. Chilcote, T. Cotten, R. Doyon, T. Esposito, M. Fitzgerald, K. Follette, B. Gerard, B. Gerard, S. Goodsell, J. Graham, A. Greenbaum, P. Hibon, L. Hung, P. Ingraham, Q. Konopacky, J. Larkin, J. Maire, F. Marchis, C. Marois, C. Marois, S. Metchev, S. Metchev, R. Oppenheimer, D. Palmer, J. Patience, M. Perrin, L. Poyneer, L. Pueyo, A. Rajan, F. Rantakyrö, J. Ruffio, D. Savransky, A. Schneider, A. Sivaramakrishnan, I. Song, R. Soummer, Sandrine Thomas, J. Wallace, K. Ward-Duong, S. Wiktorowicz, S. Wolff   +58 more
semanticscholar   +1 more source

Optimizing image processing for modern wide field surveys: enhanced data management based on the LSST science pipelines

Frontiers in Astronomy and Space Sciences
Introduction: In recent decades, numerous large survey projects have been initiated to enhance our understanding of the cosmos. Among these, the Vera C.
Yuanyu Hong, Yuanyu Hong, Chao Yang, Chao Yang, Miaomiao Zhang, Yanpeng Chen, Yanpeng Chen, Binyang Liu   +7 more
doaj   +1 more source

Simulation study of asteroid mass determination using CSST asteroid observations

Frontiers in Astronomy and Space Sciences, 2023
The objective of this study is to explore the potential of the Chinese Space Station Telescope (CSST) in asteroid mass determination with asteroid-asteroid close encounters.
Fan Li, Ye Yuan, Yanning Fu, Jian Chen, Jian Chen   +4 more
doaj   +1 more source

Gaia: Organisation and challenges for the data processing [PDF]

, 2007
Gaia is an ambitious space astrometry mission of ESA with a main objective to map the sky in astrometry and photometry down to a magnitude 20 by the end of the next decade.
Bailer-Jones, C., Bastian, U., Drimmel, R., Eyer, L., Katz, D., Luri, X., Mignard, F., O'Mullane, W., Passot, X., Pourbaix, D., Prusti, T., van Leeuwen, F.   +11 more
core   +4 more sources

COMMISSION 8: ASTROMETRY [PDF]

Proceedings of the International Astronomical Union, 2011
Gaia is continuing well with its development and construction and is expected to achieve parallax accuracies of about 10 to 300 μas for 6 to 20 mag. It is scheduled to launch in 2013. The ICRF2 was adopted by the IAU in 2009 as the new fundamental celestial reference frame.
Evans, Dafydd W., Zacharias, Norbert, Kumkova, Irina, Andrei, Alexandre Humberto, Brown, Anthony, Gouda, Naoteru, Popescu, Petre, Souchay, Jean, Unwin, Stephen C., Zhu, Z.   +9 more
openaire   +2 more sources

Observations of a Disconnection Event and Other Large‐Scale Disturbances in the Ion Tail of Comet C/2022 E3 (ZTF)

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract We analyze five large‐scale tail disturbances in comet C/2022 E3 (ZTF)'s ion tail using images from astrophotographers, tracking specific features within the tail to determine their speeds. We employ a heliosphere model to estimate when the comet crossed the heliospheric current sheet (HCS).
A. Wellbrock, G. H. Jones
wiley   +1 more source

Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution

Universe, 2022
The unprecedented quality of the astrometric measurements obtained with the ESA Gaia spacecraft have initiated a revolution in Milky Way astronomy. Studies of star clusters in particular have been transformed by the precise proper motions and parallaxes ...
Tristan Cantat-Gaudin
doaj   +1 more source

A comparison of participatory science seining and electrofishing for sampling fish assemblages in an urban river

Ecological Solutions and Evidence, Volume 6, Issue 2, April–June 2025.
Venn Diagram of fish species captured by seining and electrofishing. The 10 most frequent species captured in the watershed are represented in the overlapping area as well as an outline of the state of Michigan with the Rouge River watershed highlighted. Both sides have a picture of method collection with a darter on the seining side and a trout on the
Olivia F. Williams, Sally Petrella, Lauren Eaton, Robert Muller, Philip Kukulski, Paul Seelbach, Catherine Riseng, Karen M. Alofs   +7 more
wiley   +1 more source

Software and Techniques for VLBI Data Processing and Analysis

Universe, 2022
Very-long-baseline interferometry (VLBI) is a challenging observational technique, which requires in-depth knowledge about radio telescope instrumentation, interferometry, and the handling of noisy data.
Michael Janssen, Jack F. Radcliffe, Jan Wagner   +2 more
doaj   +1 more source