Results 121 to 130 of about 11,731 (215)

Preperihelion Volatile Evolution of Interstellar Comet 3I/ATLAS Indicating Significant Contribution from an Extended Source in the Coma

The Astrophysical Journal Letters
Interstellar comets provide rare opportunities for probing the diversity of refractory and volatile inventory around other stars. As the second ever interstellar comet and the third interstellar object, 3I/ATLAS has been the focus of telescopic ...
Juncen Li, Xian Shi, Man-To Hui, Jianchun Shi   +3 more
doaj   +1 more source

The high optical brightness of the BlueWalker 3 satellite. [PDF]

Nature, 2023
Nandakumar S, Eggl S, Tregloan-Reed J, Adam C, Anderson-Baldwin J, Bannister MT, Battle A, Benkhaldoun Z, Campbell T, Colque JP, Damke G, Plauchu Frayn I, Ghachoui M, Guillen PF, Kaeouach AE, Krantz HR, Langbroek M, Rattenbury N, Reddy V, Ridden-Harper R, Young B, Unda-Sanzana E, Watson AM, Walker CE, Barentine JC, Benvenuti P, Di Vruno F, Peel MW, Rawls ML, Bassa C, Flores-Quintana C, García P, Kim S, Longa-Peña P, Ortiz E, Otarola Á, Romero-Colmenares M, Sanhueza P, Siringo G, Soto M.   +39 more
europepmc   +1 more source

The Celestial Frame and the Weighting of the Celestial Pole Offsets in the Computation of VLBI-Based Corrections for the Main Lunisolar Nutation Terms. [PDF]

Sensors (Basel), 2021
Puente V, Folgueira M.
europepmc   +1 more source

From reference frames to relativistic experiments: Absolute and relative radio astrometry

EAS Publications Series, 2005
25 pages, 7 figures--Presented at JENAM meeting in Budapest, 27-30 August ...
openaire   +2 more sources

A VLBI Software Correlator for Fast Radio Transients

The Astronomical Journal
One major goal in fast radio burst science is to detect fast radio bursts (FRBs) over a wide field of view without sacrificing the angular resolution required to pinpoint them to their host galaxies.
Calvin Leung, Shion Andrew, Kiyoshi W. Masui, Charanjot Brar, Tomas Cassanelli, Shami Chatterjee, Victoria Kaspi, Kholoud Khairy, Adam E. Lanman, Mattias Lazda, Juan Mena-Parra, Gavin Noble, Aaron B. Pearlman, Mubdi Rahman, Pranav Sanghavi, Vishwangi Shah, (CHIME/FRB Collaboration)   +16 more
doaj   +1 more source

Discovery of a radio emitting neutron star with an ultra-long spin period of 76 seconds. [PDF]

Nat Astron, 2022
Caleb M, Heywood I, Rajwade K, Malenta M, Stappers B, Barr E, Chen W, Morello V, Sanidas S, van den Eijnden J, Kramer M, Buckley D, Brink J, Motta SE, Woudt P, Weltevrede P, Jankowski F, Surnis M, Buchner S, Bezuidenhout MC, Driessen LN, Fender R.   +21 more
europepmc   +1 more source

VLBI astrometry of radio stars to link radio and optical celestial reference frames: observing strategies

Monthly Notices of the Royal Astronomical Society
ABSTRACT The Gaia celestial reference frame (Gaia-CRF) will benefit from a close assessment with independent methods, such as Very Long Baseline Interferometry (VLBI) measurements of radio stars at bright magnitudes. However, obtaining full astrometric parameters for each radio star through VLBI measurements demands a significant amount ...
Jingdong Zhang, Bo Zhang, Shuangjing Xu, Niu Liu, Wen Chen, Hao Ding, Pengfei Jiang, Yan Sun, Jinqing Wang, Lang Cui, Shiming Wen, Xiaofeng Mai, Jinling Li, Fengchun Shu, Yidan Huang   +14 more
openaire   +2 more sources

Dynamical Mass of the Ophiuchus Intermediate-mass Stellar System S1 with DYNAMO-VLBA

The Astronomical Journal
We report dynamical mass measurements of the individual stars in the most luminous and massive stellar member of the nearby Ophiuchus star-forming region, the young tight binary system S1.
Jazmín Ordóñez-Toro, Sergio A. Dzib, Laurent Loinard, Gisela Ortiz-León, Marina A. Kounkel, Josep M. Masqué, S.-N. X. Medina, Phillip A. B. Galli, Trent J. Dupuy, Luis F. Rodríguez, Luis H. Quiroga-Nuñez   +10 more
doaj   +1 more source

Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination. [PDF]

Earth Planets Space, 2022
Böhm S, Böhm J, Gruber J, Kern L, McCallum J, McCallum L, McCarthy T, Quick J, Schartner M.   +8 more
europepmc   +1 more source

Submillimeter Observations of the White Dwarf Pulsar AR Sco

The Astrophysical Journal
AR Scorpii, the so-called white dwarf (WD) pulsar, contains a rapidly rotating magnetic WD ( P _spin = 117.0564 s) interacting with a cool, red dwarf (RD) companion in a 3.56 hr orbit. It is a strong radio source with an inverted spectral index between 1
Paul E. Barrett, Mark A. Gurwell
doaj   +1 more source