Results 21 to 30 of about 41,651 (296)
Photon Ring Astrometry for Superradiant Clouds. [PDF]
Physical Review Letters, 2022 Gravitational atoms produced from the superradiant extraction of rotational energy of spinning black holes can reach energy densities significantly higher than that of dark matter, turning black holes into powerful potential detectors for ultralight ...
Yifan Chen +3 more
semanticscholar +1 more source
Relative Astrometry in an Annular Field [PDF]
Publications of the Astronomical Society of the Pacific, 2022 Background. Relative astrometry at or below the microarcsec level with a 1 m class space telescope has been repeatedly proposed as a tool for exo-planet detection and characterization, as well as for several topics at the forefront of Astrophysics and ...
M. Gai +6 more
semanticscholar +1 more source
Photometry and astrometry with JWST -- I. NIRCam Point Spread Functions and the first JWST colour-magnitude diagrams of a globular cluster [PDF]
, 2022 As the James Webb Space Telescope (JWST) has become fully operational, early-release data are now available to begin building the tools and calibrations for precision point-source photometry and astrometry in crowded cluster environments.
D. Nardiello +6 more
semanticscholar +1 more source
orvara: An Efficient Code to Fit Orbits Using Radial Velocity, Absolute, and/or Relative Astrometry [PDF]
Astronomical Journal, 2021 We present an open-source Python package, Orbits from Radial Velocity, Absolute, and/or Relative Astrometry (orvara), to fit Keplerian orbits to any combination of radial velocity, relative astrometry, and absolute astrometry data from the Hipparcos-Gaia
Timothy D. Brandt +7 more
semanticscholar +1 more source
Asteroid astrometry by stellar occultations: Accuracy of the existing sample from orbital fitting [PDF]
Astronomy & Astrophysics, 2022 Context. The technique of stellar occultations, greatly enhanced by the publication of the Gaia data releases, permits not only the determination of asteroid size and shape, but also the retrieval of additional, very accurate astrometry, with a possible ...
João Ferreira +4 more
semanticscholar +1 more source
A hidden population of high-redshift double quasars unveiled by astrometry [PDF]
Nature Astronomy, 2021 Galaxy mergers occur frequently in the early Universe1 and bring multiple supermassive black holes (SMBHs) into the nucleus, where they may eventually coalesce.
Yue Shen +8 more
semanticscholar +1 more source
Precision Millimeter Astrometry of the α Centauri AB System [PDF]
Astronomical Journal, 2021 Alpha Centauri A is the closest solar-type star to the Sun and offers the best opportunity to find and ultimately to characterize an Earth-sized planet located in its habitable zone.
R. Akeson +4 more
semanticscholar +1 more source
Frontiers in Astronomy and Space Sciences, 2022 Given their extremely large distances and small apparent sizes, quasars are generally considered as objects with near-zero parallax and proper motion.
Qi-Qi Wu +15 more
doaj +1 more source
Unresolved stellar companions with Gaia DR2 astrometry [PDF]
Monthly notices of the Royal Astronomical Society, 2020 For stars with unresolved companions, motions of the centre of light and that of mass decouple, causing a single-source astrometric model to perform poorly.
V. Belokurov +11 more
semanticscholar +1 more source
Microarcsecond Astrometry: Science Highlights from Gaia [PDF]
, 2021 Access to microarcsecond astrometry is now routine in the radio, infrared (IR), and optical domains.
Anthony G. A. Brown
semanticscholar +1 more source