Results 31 to 40 of about 10,210 (220)

A Refined Astrometric Approach Based on the Precision Premium and its Application to the Jupiter’s Satellite Himalia

The Astronomical Journal
Since the advent of Gaia catalog, positional precision of a ground-based telescope can be greatly improved by correction of more subtle errors, including positional biases induced by atmospheric turbulence, and some instrumental factors such as geometric
Z. J. Zheng, Q. Y. Peng, F. R. Lin, D. Li   +3 more
doaj   +1 more source

VERA’s 20 yr Evolution in Science and Technology

Galaxies
We review the past 20 yr evolution of VERA (VLBI Exploration of Radio Astrometry) in both science and techinology. VERA is a VLBI array in Japan which consists of four 20 m-diameter telescopes, originally dedicated to phase-referencing VLBI astrometry ...
Mareki Honma, Tomoya Hirota, Tomoaki Oyama, Akiharu Nakagawa   +3 more
doaj   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 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   +3 more sources

Macho Photometry and Astrometry [PDF]

Symposium - International Astronomical Union, 1995
MACHOs (Massive Astrophysical Compact Halo Objects) have been discovered by their relativistic amplification of light from distant stars as they crossed very near to the line-of-sight. The very few events were detected from more than a billion photometric measurements of millions of stars in the LMC.
Høg, E., Novikov, Igor Dmitrievich, Polnarev, A.G.   +2 more
openaire   +2 more sources

Speckle Observations With PISCO in Calern (France): III. Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2019 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.
J.‐L. Prieur, M. Scardia, J.‐P. Rivet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini, D. Vernet   +11 more
wiley   +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

An Efficient Method for Measuring the Color of a Natural Satellite with Astrometric Applications

The Astronomical Journal
The Gaia DR3 catalog released in 2022 contains precise broadband photometry for more than one billion stars in the G , BP, and RP passbands, which is very useful for calibrating the differential color refraction (DCR) effect in ground-based observations.
X. Q. Fang, Q. Y. Peng, X. Lu, B. F. Guo
doaj   +1 more source

The Orbits of Uranus, Its Satellites and Rings, the Gravity Field of the Uranian System, and the Orientation of the Poles of Uranus and Its Satellites

The Astronomical Journal
R. A. Jacobson determined the orbits of the Uranian satellites, the masses of Uranus and its satellites, and the orientation of the pole of Uranus from Earth-based astrometry, Earth-based ring occultations, and observations acquired with the Voyager 2 ...
Robert A. Jacobson, Ryan S. Park
doaj   +1 more source

Stingray Sensor System for Persistent Survey of the GEO Belt

Sensors
The Stingray sensor system is a 15-camera optical array dedicated to the nightly astrometric and photometric survey of the geosynchronous Earth orbit (GEO) belt visible above Tucson, Arizona.
Tanner Campbell, Adam Battle, Dan Gray, Om Chabra, Scott Tucker, Vishnu Reddy, Roberto Furfaro   +6 more
doaj   +1 more source