Results 11 to 20 of about 165 (125)

The Radio Fundamental Catalog. I. Astrometry

The Astrophysical Journal Supplement Series
We present an all-sky catalog of absolute positions and estimates of correlated flux density of 21,942 compact radio sources determined from processing interferometric visibility data of virtually all very long baseline interferometry (VLBI) observing ...
L. Y. Petrov, Y. Y. Kovalev
doaj   +4 more sources

Radio Astrometry at Different Frequencies

The Astronomical Journal
The very long baseline interferometry technique allows us to determine the positions of thousands of radio sources using the absolute astrometry approach. I have investigated the impacts of a selection of observing frequencies in a range from 2 to 43 GHz
Leonid Petrov
doaj   +2 more sources

Microarcsecond Radio Astrometry [PDF]

Annual Review of Astronomy and Astrophysics, 2014
Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate the size, luminosity, mass, and ages of most objects.
Reid, M. J., Honma, M.
openaire   +2 more sources

VLBI MultiView Astrometry of Radio Stars

Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022), 2023
The expected emission mechanisms for radio loud M dwarfs include plasma emission, gyrosynchrotron emission during short lived (<2 hrs) flares, and Electron Cyclotron Maser Instability (ECMI) which can occur in planetary aurorae, and interaction between a star and a planetary companion.
Boven, E.P., Vedantham, H.K., Callingham, J.R., Langevelde, H.J. van   +3 more
openaire   +3 more sources

RADIO ASTROMETRY OF THE TRIPLE SYSTEMS ALGOL AND UX ARIETIS [PDF]

The Astrophysical Journal, 2011
We have used multi-epoch long-baseline radio interferometry to determine the proper motion and orbital elements of Algol and UX Arietis, two radio-bright, close binary stellar systems with distant tertiary components. For Algol, we refine the proper motion and outer orbit solutions, confirming the recent result of Zavala et al.
Peterson, W. M., Mutel, R. L., Lestrade, Jean-François, Güdel, Manuel, Goss, W. M.   +4 more
openaire   +6 more sources

Photographic astrometry of radio stars [PDF]

Monthly Notices of the Royal Astronomical Society, 1991
Photographic astrometry of four radio stars has been carried out in a test program using the Wide Field Camera at the f/8 focus of the Jacobus Kapteyn Telescope (JKT). The accuracy of the positions is 0.04 arcsec. Comparisons are made with positions obtained by the Carlsberg and Bordeaux automatic meridian circles and with the radio positions measured ...
R. W. Argyle, L. V. Morrison, M. J. Irwin, P. S. Bunclark   +3 more
openaire   +1 more source

RADIO ASTROMETRY OF THE CLOSE ACTIVE BINARY HR 5110 [PDF]

The Astrophysical Journal, 2015
The close active binary HR 5110 was observed at six epochs over 26 days using a global VLBI array at 15.4~GHz. We used phase-referencing to determine the position of the radio centroid at each epoch with an uncertainty significantly smaller than the component separation.
Abbuhl, E., Mutel, R., Lynch, Christene, Gï Edel, M.   +3 more
openaire   +4 more sources

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, P. J. A. McCausland, A. R. Hildebrand, L. T. J. Hanton, L. M. Eckart, H. Busemann, D. Krietsch, C. Maden, K. Welten, M. W. Caffee, M. Laubenstein, D. Vida, F. Ciceri, E. Silber, C. D. K. Herd, P. Hill, H. Devillepoix, Eleanor K. Sansom, Martin Cupák, Seamus Anderson, R. L. Flemming, A. J. Nelson, M. Mazur, D. E. Moser, W. J. Cooke, D. Hladiuk, Barbara Malečić, Maja Telišman Prtenjak, R. Nowell, The Golden Meteorite Consortium   +29 more
wiley   +1 more source

Radio Astrometry [PDF]

Symposium - International Astronomical Union, 1984
Radio astrometry is now the premier astrometric technique for measuring the positions of celestial objects. The precision with which absolute positions can be determined is approaching a few milliarc-seconds. The progress towards establishing an almost inertial reference frame based upon the positions of extragalactic radio sources is reviewed as of ...
openaire   +1 more source

The Use of the Ratan-600 Radio Telescope in Astrometry [PDF]

Symposium - International Astronomical Union, 1986
The RATAN-600 radio telescope (Kaidanovsky & al. 1972) was designed for solving various problems of astrophysics and radiophysics (Pariisky & al. 1972, Gelfreikh & al. 1972). Because of its high resolving power and large collecting area, this instrument can be used to measure accurate positions of radio sources.
P. M. Afanasieva, V. A. Fomin, Yu K. Zverev, M. G. Mingaliev, V. N. L'Vov, A. A. Pozhalov   +5 more
openaire   +1 more source