Results 11 to 20 of about 11,697 (215)
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
Journal of Field Robotics, Volume 40, Issue 4, Page 828-847, June 2023., 2023 Abstract This paper describes the design, implementation, and field‐testing of a low‐cost autonomous control system on the Platform for Expanding Autonomous Underwater Vehicles (AUV) exploRation to Longer ranges (PEARL). PEARL is a floating, solar‐powered platform designed as a servicing station for AUVs.
Ethan S. Rolland +2 more
wiley +1 more source
Optical astrometry of Benchmark radio sources [PDF]
Astronomy and Astrophysics Supplement Series, 1997 Optical positions relative to the International Reference Stars Catalogue (IRS), and therefore in the sys- tem of the FK5, have been obtained for the optical coun- terparts of 40 compact extragalactic radio sources south of +6. Many of these sources are being consid- ered as possible Benchmark objects for the establishment of a quasi inertial unied ...
Costa Hechenleitner, Edgardo, Loyola, P.
openaire +1 more source
CCD astrometry of faint compact extragalactic radio sources. III. [PDF]
Astronomy & Astrophysics, 2001 Optical positions relative to the Hipparcos Catalogue (ESA 1997) have been obtained for the optical counterparts of 28 faint (B 20 23) southern compact extragalactic radio sources (CERS). Most of these sources are not adequately observable (or simply not visible) by means of direct photography with a conventional wide- eld telescope, so the positions ...
E. Costa, P. Loyola
openaire +6 more sources
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. +3 more
openaire +4 more sources
Journal of Geophysical Research: Solid Earth, Volume 128, Issue 3, March 2023., 2023 Abstract We report the results of position ties for short baselines at eight geodetic sites based on phase delays that are extracted from global geodetic very‐long‐baseline interferometry (VLBI) observations rather than dedicated short‐baseline experiments.
Ming H. Xu +13 more
wiley +1 more source
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 +3 more
openaire +1 more source
VLBI Astrometry of Radio-Emitting Stars [PDF]
Symposium - International Astronomical Union, 1995 High-accuracy astrometric VLBI observations of 7 radio stars are presented with applications to the connection between the Hipparcos and VLBI extragalactic reference frames, to the identification of the radio emitting region in the ternary system Algol and the detectabity of Jupiter-size planet orbiting the radio star σ2 CrB.
J.-F. Lestrade +6 more
openaire +1 more source
Combination Strategy for the Geocentric Realization of Regional Epoch Reference Frames
Journal of Geophysical Research: Solid Earth, Volume 127, Issue 10, October 2022., 2022 Abstract For high‐resolution regional geodetic applications, the International Terrestrial Reference Frame (ITRF) is complemented by regional densifications. These are realized either as multi‐year solutions related to a tectonic plate (e.g., EUREF for Europe) or as epoch reference frames (ERFs) to capture nonlinear geophysical station motions caused ...
A. Kehm +6 more
wiley +1 more source