Results 11 to 20 of about 909 (203)
Toward Microarcsecond Astrometry for the Innermost Wobbling Jet of the BL Lacertae Object OJ 287 [PDF]
The Astrophysical Journal Letters, 2023 The BL Lacertae object OJ 287 is a very unusual quasar producing a wobbling radio jet and some double-peaked optical outbursts with a possible period of about 12 yr for more than one century.
Xiaopeng Cheng +5 more
doaj +3 more sources
The Present Status of Astrometry at Optical and Radio Wavelengths [PDF]
Symposium - International Astronomical Union, 1994 A Review is presented of the present status of astrometry towards defining a radio/optical reference frame.
K J Johnston, Johnston K J
exaly +2 more sources
Radio Astrometry Using Connected-Element Interferometers [PDF]
Symposium - International Astronomical Union, 1974 The basic techniques of conventional radio interferometry are explained and a review given of the achievements and limitations of the methods as applied to radio astrometry.
Elsmore B
exaly +2 more sources
Astrometry and geodesy with radio interferometry: experiments, models, results [PDF]
Reviews of Modern Physics, 1998 83 pages, 19 Postscript figures. To be published in Rev. Mod. Phys., Vol.
Christopher S Jacobs
exaly +3 more sources
Accurate Astrometry of 22 Southern Hemisphere Radio Sources [PDF]
Astronomical Journal, 2004 Milliarcsecond-accurate radio positions for 22 southern hemisphere extragalactic sources are reported. These positions are derived from Mark III very long baseline interferometry observations made between 2003 February and 2003 August. The results presented here supplement an ongoing project to increase the sky density of southern hemisphere sources in
Alan L Fey +2 more
exaly +2 more sources
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 +2 more
doaj +1 more source
Position and Proper Motion of Sagittarius A* in the ICRF3 Frame from VLBI Absolute Astrometry
The Astronomical Journal, 2023 Sagittarius A* (Sgr A*) is a strong, compact radio source believed to be powered by a supermassive black hole at the galactic center. Extinction by dust and gas in the galactic plane prevents observing it optically, but its position and proper motion ...
David Gordon +2 more
doaj +1 more source
The Golden meteorite fall: Fireball trajectory, orbit, and meteorite characterization
Meteoritics &Planetary Science, Volume 58, Issue 12, Page 1773-1807, December 2023., 2023 Abstract The Golden (British Columbia, Canada) meteorite fall occurred on October 4, 2021 at 0534 UT with the first recovered fragment (1.3 kg) landing on an occupied bed. The associated fireball was recorded by numerous cameras permitting reconstruction of its trajectory and orbit. The fireball entered the atmosphere at a 54° angle from the horizontal
P. G. Brown +29 more
wiley +1 more source
First Observations With a GNSS Antenna to Radio Telescope Interferometer
Radio Science, Volume 58, Issue 8, August 2023., 2023 Abstract We describe the design of a radio interferometer composed of a Global Navigation Satellite Systems (GNSS) antenna and a Very Long Baseline Interferometry radio telescope. Our eventual goal is to use this interferometer for geodetic applications including local tie measurements.
J. Skeens +7 more
wiley +1 more source
The Million Quasars (Milliquas) Catalogue, v8
The Open Journal of Astrophysics, 2023 Announcing the final release, v8, of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 30 June 2023, including quasars from the first releases of the Dark Energy Spectroscopic Instrument (DESI) and the SDSS-DR18 ...
Eric Wim Flesch
doaj +1 more source