Results 61 to 70 of about 6,728 (225)

Optical interferometry and astrometry of exoplanets

, 2022
Urbain Le Verrier, 175 years ago, was able to predict the existence and position of Neptune from the trajectory of Uranus. Could we make similar detections with exoplanets?
Lacour, Sylvestre
core   +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

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

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

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

Astrometric microlensing probes of the isolated neutron star population with Roman

Astronomy & Astrophysics
Context. Notoriously hard to detect and study, isolated neutron stars (NSs) might provide valuable answers to fundamental questions about stellar evolution and explosion physics.
Kaczmarek Z., Halasi-Kun A., McGill P., Perkins S. E., Dawson W. A.   +4 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

High-precision astrometry and the modelling of stellar spectra

, 1995
The impact of high-precision astrometry on modelling of stellar spectra and determination of fundamental stellar parameters for single stars is discussed.
Gustafsson, Bengt,
core  

Space astrometry in the Gaia era and beyond

, 2015
In this contribution I provide some thoughts on the options for future space astrometry missions, with a focus on global astrometry. The next big step in space astrometry ideally would open up a new accuracy or wavelength domain (or a combination of both)
A.G.A. Brown
core   +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