Results 61 to 70 of about 31,207 (206)

Globally Critical Infrastructure: The Unique Risks and Challenges

Risk Analysis, Volume 45, Issue 12, Page 4804-4817, December 2025.
ABSTRACT Critical infrastructure is typically identified at the national level. However, disruption to certain infrastructure systems, facilities, and assets can have negative consequences for global societies. Such globally critical infrastructure entails a distinct risk profile for both countries dependent on the infrastructure, and countries that ...
Zachary Kallenborn, Henry H. Willis
wiley   +1 more source

Connecting VLBI and Gaia celestial reference frames

Frontiers in Astronomy and Space Sciences, 2016
The current state of the link problem between radio and optical celestial reference frames is considered.The main objectives of the investigations in this direction during the next few years are the preparation of a comparisonand the mutual orientation ...
Zinovy Malkin
doaj   +1 more source

GAIA: AGB stars as tracers of star formation histories in the Galaxy and beyond

, 2003
We discuss the tracing of star formation histories with ESA's space astrometry mission GAIA, emphasizing the advantages of AGB stars for this purpose. GAIA's microarcsecond-level astrometry, multi-band photometry and spectroscopy will provide individual ...
A Kučinskas, FR Ferraro, G Bertelli, MAC Perryman, V Vansevičius   +4 more
core   +2 more sources

PEXO : a global modeling framework for nanosecond timing, microsecond astrometry, and μm/s radial velocities [PDF]

, 2019
54 pages, 2 tables, 19 figures, accepted for publication in ApJS, PEXO is available at https://github.com/phillippro/pexoThe ability to make independent detections of the signatures of exoplanets with complementary telescopes and instruments brings a new
Alan P. Boss, Arzoumanian Z., Auer L. H., Beichman C., Catanzarite J., Catanzarite J. H., Damour T., Eastman J., Eastman J., ESA (ed), Event Horizon Telescope Collaboration, Fabian A. C., Fabo Feng, Feng F., Folkner W. M., Folkner W. M., Folkner W. M., Fomalont E. B., Fomalont E. B., Gubler J., Guillem Anglada-Escudé, Hohenkerk C., Holczer T., Hugh R. A. Jones, Irwin A. W., Johns-Krull C. M., Jordán A., Kjeldsen H., Klioner S. A., Klioner S. A., Kopeikin S. M., Kopeikin S. M., Kopeikin S. M., Lelli F., Maksym Lisogorskyi, Mamajek E. E., Mangum J. G., McCarthy D. D., Mignard F., Miralda-Escudé J., Misner C. W., Moe M., Murray C. D., Perryman M., Petit G., Petit G. ed Finkelstein A., Plavchan P., Pourbaix D., Psaltis D. ed Kaaret P., R. Paul Butler, Rüeger J., Sana H., Sergei M. Kopeikin, Standish E., Standish E. M., Thiele T. N., Unwin S. C., Viswanathan V., Weisberg J. M., Wex N., Winn J. N., Wright J. T., Zhao L.   +62 more
core   +3 more sources

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

RESULTS OF PROCESSING OF ASTRONEGATIVES WITH COMMERCIAL SCANNER

Odessa Astronomical Publications, 2014
Astrometric errors depending on the method of scanning with different spatial resolutions were studied  with commercial scanner such as   Epson Perfection V750 Pro.
Yu. I. Protsyuk, O. E. Kovylianska, S. V. Protsyuk, V. N. Andruk   +3 more
doaj   +1 more source

Integration of Statistical Models and Deep Learning: A CEEMDAN‐Based Hybrid Framework for Frequency‐Domain Prediction of Polar Motion

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract High‐precision Earth Rotation Parameter (ERP) products often experience delays that range from several days to weeks. The use of precise forecasting models can effectively compensate for the impact of such delays. Based on a systematic analysis of the forecasting capabilities of the traditional harmonic least squares fitting and autoregressive
Chen Ren, Chen Wang, Zhenhong Li, Haoran Gong, Jialiang Liu   +4 more
wiley   +1 more source

The Hubble Missing Globular Cluster Survey

Astronomy & Astrophysics
The Hubble Missing Globular Cluster Survey has secured high-quality astro-photometric data in two bands for 34 clusters never observed with HST. When combined with Gaia astrometry, this dataset enables the investigation of the bulk motion and the ...
Rosignoli L., Libralato M., Pascale R., Massari D., Dalessandro E., Ceccarelli E., Baumgardt H., Bellazzini M., Bellini A., Aguado-Agelet F., Cassisi S., Monelli M., Mucciarelli A., Pancino E., Salaris M., Dodd E., Ferraro F. R., Lanzoni B.   +17 more
doaj   +1 more source

SOFTWARE FOR PROCESSING OF DIGITIZED ASTRONEGATIVES FROM ARCHIVES AND DATABASES OF VIRTUAL OBSERVATORY

Odessa Astronomical Publications, 2014
The paper discusses and illustrates the steps of  basic processing  of  digitized image of astro negatives. Software for  obtaining of a  rectangular coordinates and photometric values of objects on photographic plates was created in the environment ...
Yu. I. Protsyuk, L. V. Kazantseva, V. N. Andruk   +2 more
doaj   +1 more source

Know The Star, Know the Planet. IV. A Stellar Companion to the Host star of the Eccentric Exoplanet HD 8673b [PDF]

, 2015
HD 8673 hosts a massive exoplanet in a highly eccentric orbit (e=0.723). Based on two epochs of speckle interferometry a previous publication identified a candidate stellar companion.
Angione, John, Baranec, Christoph, Bouchez, Antonin, Bui, Khanh, Burruss, Rick, Burse, Mahesh, Chordia, Pravin, Croner, Ernest, Das, Hillol, Dekany, Richard G., Guiwits, Stephen, Hale, David, Henning, John, Kulkarni, Shrinivas, Law, Nicholas M., Mason, Brian D., McKenna, Dan, Milburn, Jennifer, Neyman, Christopher R., Palmer, Dean, Punnadi, Sujit, Ramaprakash, A. N., Riddle, Reed L., Roberts, Jennifer E., Roberts, Lewis C., Jr., Shelton, J. Christopher, Tendulkar, Shriharsh P., Trinh, Thang, Troy, Mitchell, Truong, Tuan, Wu, Yanqin, Zolkower, Jeff   +31 more
core   +3 more sources