Results 51 to 60 of about 11,697 (215)

Reassessing the Relationship Between Meteor Radio Afterglows and Optical Persistent Trains

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Meteor radio afterglows (MRAs) and optical persistent trains (PTs) are two types of long‐lived phenomena which are occasionally observed following the occurrence of a meteor. Both phenomena are thought to be produced by intrinsic emission mechanisms; PTs have been associated with chemiluminescent reactions between meteoric metals and ...
L. E. Cordonnier, K. S. Obenberger, G. B. Taylor, J. M. Holmes, J. Dowell, D. Vida   +5 more
wiley   +1 more source

The Radio Parallax of the Crab Pulsar: A First VLBI Measurement Calibrated with Giant Pulses

The Astrophysical Journal, 2023
We use four observations with the European very long baseline interferometry (VLBI) network to measure the first precise radio parallax of the Crab Pulsar. We found two in-beam extragalactic sources just outside the Crab Nebula, with one bright enough to
Rebecca Lin, Marten H. van Kerkwijk, Franz Kirsten, Ue-Li Pen, Adam T. Deller   +4 more
doaj   +1 more source

Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region

, 2008
We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations (taken in 2006).
Arcadio Poveda, Bower G. C., Christine Allen, Felli M., Felli M., Furuya R. S., Kaifu N., Karl M. Menten, Laura Gómez, Laurent Loinard, Luis F. Rodríguez, Raga A. C., Rodriguez-Franco A., Susana Lizano   +13 more
core   +1 more source

The Celestial Reference Frame at K Band: Imaging. I. The First 28 Epochs

The Astronomical Journal, 2023
We present K -band (24 GHz) images of 731 compact extragalactic radio sources with submilliarcsecond resolution, based on radio interferometric observations made with the Very Long Baseline Array of 10 telescopes during 29 day long sessions spanning from
Aletha de Witt, Christopher S. Jacobs, David Gordon, K-band Celestial Reference Frame Collaboration, Michael Bietenholz, Marisa Nickola, Alessandra Bertarini   +6 more
doaj   +1 more source

Improving the Accuracy of Radio Astrometry [PDF]

International Astronomical Union Colloquium, 2000
AbstractThe International Celestial Reference Frame (ICRF) is currently realized by the radio positions of compact extragalactic objects obtained by the technique of Very Long Baseline Interferometry (VLBI). The positions of the defining sources with the highest quality are estimated to be accurate at the 0.25 milliarcsecond (mas) level.
openaire   +1 more source

Optical and radio astrometry of the galaxy associated with FRB 150418 [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract A fading radio source, coincident in time and position with the fast radio burst FRB 150418, has been associated with the galaxy WISE J071634.59−190039.2. Subsequent observations of this galaxy have revealed that it contains a persistent, but variable, radio source. We present e-Multi-Element Radio Linked Interferometer Network,
Bassa, C. G., Beswick, R., Tingay, S. J., Keane, E. F., Bhandari, S., Johnston, S., Totani, T., Tominaga, N., Yasuda, N., Stappers, B. W., Barr, E. D., Kramer, M., Possenti, A.   +12 more
openaire   +6 more sources

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

Constraints on the Persistent Radio Source Associated with FRB 20190520B Using the European VLBI Network

The Astrophysical Journal Letters, 2023
We present very long baseline interferometry (VLBI) observations of a continuum radio source potentially associated with the fast radio burst source FRB 20190520B.
Shivani Bhandari, Benito Marcote, Navin Sridhar, Tarraneh Eftekhari, Jason W. T. Hessels, Danté M. Hewitt, Franz Kirsten, Omar S. Ould-Boukattine, Zsolt Paragi, Mark P. Snelders   +9 more
doaj   +1 more source

Improving the Reference Frame by Radio–and Optical Astrometry of Radio Stars [PDF]

International Astronomical Union Colloquium, 1991
AbstractA longterm program of precise radio – and optical astrometry of selected radio stars has been conducted in the last decade by our observatories using the VLA and astrographs on both hemispheres. Positions of 54 stars north of −26 deg. declination including 6 MASER stars have been obtained.
Chr. de Vegt, N. Zacharias, K.J. Johnston, R. Hindsley   +3 more
openaire   +1 more source

Review of asteroid, meteor, and meteorite‐type links

Meteoritics &Planetary Science, Volume 60, Issue 4, Page 928-973, April 2025.
Abstract With the goal to determine the origin of our meteorites in the asteroid belt, video and photographic observations of meteors have now tracked 75 meteorite falls. Six years ago, there were just hints that different meteorite types arrived on different orbits, but now, the number of orbits (N) is high enough for distinct patterns to emerge.
Peter Jenniskens, Hadrien A. R. Devillepoix   +1 more
wiley   +1 more source