Results 61 to 70 of about 11,793 (207)

The hot core-ultracompact HII connection in G10.47+0.03 [PDF]

, 2004
We present infrared imaging and spectroscopic data of the complex massive star-forming region G10.47+0.03. The detection of seven mid-infrared (MIR) sources in our field combined with a sensitive Ks/ISAAC image allows to establish a very accurate ...
B. Brandl, B. Stecklum, Caswell, Cesaroni, Churchwell, Churchwell, Churchwell, Cohen, D. Apai, De Buizer, De Buizer, de Vicente, Draine, Garay, Grevesse, Hatchell, Hatchell, Hayward, Henning, Hofner, Hofner, I. Pascucci, Kaufman, Lada, Martins, Martín-Hernández, Maxia, Mokiem, Okamoto, Okamoto, Olmi, Olmi, Olmi, Osorio, Ossenkopf, Panagia, Panagia, Pantin, Persson, Saraph, Schaerer, Siebenmorgen, Stasinska, Stecklum, Th. Henning, Vacca, Walsh, Watt, Watt, Weingartner, Wood, Wyrowski, Yorke   +52 more
core   +3 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

Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of the Crab Nebula

The Astrophysical Journal
Measuring plasma parameters in the upper solar corona and inner heliosphere is challenging because of the region’s weakly emissive nature and inaccessibility for most in situ observations.
Peijin Zhang, Surajit Mondal, Bin Chen, Sijie Yu, Dale Gary, Marin M. Anderson, Judd D. Bowman, Ruby Byrne, Morgan Catha, Xingyao Chen, Sherry Chhabra, Larry D’Addario, Ivey Davis, Jayce Dowell, Katherine Elder, Gregg Hallinan, Charlie Harnach, Greg Hellbourg, Jack Hickish, Rick Hobbs, David Hodge, Mark Hodges, Yuping Huang, Andrea Isella, Daniel C. Jacobs, Ghislain Kemby, John T. Klinefelter, Matthew Kolopanis, Nikita Kosogorov, James Lamb, Casey J. Law, Nivedita Mahesh, Brian O’Donnell, Kathryn Plant, Corey Posner, Travis Powell, Vinand Prayag, Andres Rizo, Andrew Romero-Wolf, Jun Shi, Greg Taylor, Jordan Trim, Mike Virgin, Akshatha Vydula, Sandy Weinreb, David Woody   +45 more
doaj   +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

Absolute astrometry in the next 50 years [PDF]

, 2017
With Gaia in orbit since December 2013 it is time to look at the future of fundamental astrometry and a time frame of 50 years is needed in this matter.
Høg, Erik
core   +2 more sources

Astrometry of circumstellar masers [PDF]

, 2002
The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this technique is discussed, including the accuracy and the uncertainties of the method.
A Eckart, F Colomer, HJ Langevelde Van, HJ Langevelde Van, KM Menten, LO Sjouwerman, P Sivagnanam   +6 more
core   +2 more sources

MERLIN Astrometry of 11 Radio Stars

The Astronomical Journal, 2006
We report accurate positions in the International Celestial Reference Frame (ICRF) for 11 radio stars. Observations were made using the Multi-Element Radio Linked Interferometer Network at a radio frequency of 5 GHz. The positions are estimated to be accurate at the 5 mas level.
Alan L. Fey, David A. Boboltz, Ralph A. Gaume, Kenneth J. Johnston, Simon T. Garrington, Peter Thomasson   +5 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

Partial Alignment of Astrometric Position Excursions of International Celestial Reference Frame Quasars with Radio Jet Structures

The Astrophysical Journal Letters
Published analyses of very long baseline interferometry data for the sources included in the third International Celestial Reference Frame catalog have revealed object-specific, excess astrometric variability and quasi-coherent trajectories as functions ...
Valeri V. Makarov, Phil Cigan, David Gordon, Megan C. Johnson, Christopher DiLullo, Sébastien Lambert   +5 more
doaj   +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