Results 71 to 80 of about 165 (125)
Prototype System for Unmanned Reference Point Determination at the Sub‐Millimeter Level
Earth and Space Science, Volume 11, Issue 2, February 2024.Abstract The determination of reference points for telescopes is crucial for obtaining the local‐tie vector for a multi‐technology co‐located station. Traditional methods suffer from labor‐intensive fieldwork, long execution cycles, and systematic errors due to the incident angle of the total station's laser beam on the prism. In this paper, we propose
Zhibin Zhang +7 more
wiley +1 more source
Radio-loudness Statistics of Quasars from Quaia-VLASS
The Astrophysical Journal Supplement SeriesQuasars are objects of high interest in extragalactic astrophysics, cosmology, and astrometry. One of their useful qualities is their potential radio-loudness.
Nestor Arsenov +3 more
doaj +1 more source
Radio Follow-up Observations of SN 2023ixf by Japanese and Korean Very Long Baseline Interferometers
The Astrophysical JournalWe report on radio follow-up observations of the nearby Type II supernova SN 2023ixf, spanning from 1.7 to 269.9 days after the explosion, conducted using three very long baseline interferometers (VLBIs), which are the Japanese VLBI Network, the VLBI ...
Yuhei Iwata +12 more
doaj +1 more source
VERA monitoring of a blazar OJ 287
EPJ Web of Conferences, 2013 We present the frequent VLBI monitoring results of blazar OJ 287 at 22 GHz band using the VLBI Exploration of Radio Astrometry (VERA) from 2010 November to 2012 September. Time interval of the monitoring is typically once or twice per month.
Sawada-Satoh S. +4 more
doaj +1 more source
VLA+PT Astrometry of 46 Radio Stars
, 2006 We have used the Very Large Array (VLA), linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 46 radio stars in the International Celestial Reference Frame (ICRF). Positions were obtained in the ICRF directly through phase referencing of the stars to nearby ICRF quasars whose positions are accurate at the 0 ...
Boboltz, D. A. +6 more
openaire +2 more sources
A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz
The Astronomical JournalExtending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite challenging due to
Shuangjing Xu +16 more
doaj +1 more source
Radio Astrometry towards the Nearby Universe with the SKA
, 2016 16 pages, 13 figures, Chapter in the SKA Japan Science Book, provided by SKA Japan Astrometry Science Working ...
Imai, Hiroshi +7 more
openaire +2 more sources
A Radio Flaring, Chromospherically Inactive K Dwarf
The Astrophysical JournalWe report on an unusual radio source (J180526−292953), initially identified as a steep spectrum, polarized point source toward the Galactic bulge and found to coincide with the nearby K dwarf HD 317101A.
Dale A. Frail +12 more
doaj +1 more source
Astronomy & AstrophysicsRecent analyses of Titan’s orbital migration have yielded conflicting results regarding Saturn’s tidal dissipation (Q) at Titan’s frequency. While some studies reported a low Q consistent with resonance locking using independent radio science and ...
Magnanini Andrea +4 more
doaj +1 more source
Precise optical and radio astrometry of the quasar 1928 + 738
The Astronomical Journal, 1987 Precise optical and radio positions of the quasar 1928 + 738 have been obtained in the FK4 system from direct photography and VLA astrometry. In addition, for the first time, precise astrometric positions have been obtained from CCD frames related to the FK4 system by faint reference stars derived from the photographic plates.
C. de Vegt, J. Schramm, K. J. Johnston
openaire +1 more source