Results 131 to 140 of about 11,697 (215)

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

Time-lapse Very Long Baseline Interferometry Imaging of the Close Active Binary HR 1099

The Astrophysical Journal
We report multiepoch astrometric very long baseline interferometry observations of the chromospherically active binary HR 1099 (V711 Tau, HD 22468) at six epochs over 63 days using the Very Long Baseline Array at 22.2 GHz.
Walter W. Golay, Robert L. Mutel, Evan E. Abbuhl   +2 more
doaj   +1 more source

Resolved imaging confirms a radiation belt around an ultracool dwarf. [PDF]

Nature, 2023
Kao MM, Mioduszewski AJ, Villadsen J, Shkolnik EL.   +3 more
europepmc   +1 more source

The AllWISE Catalog as an Infrared Celestial Reference Frame in the Gaia Era

The Astronomical Journal
The launch of Gaia in 2013 December ushered in a new era of space astrometry, allowing for fundamental reference research at an unprecedented level of precision.
J.-C. Liu, N. Liu, Z. Zhu, J. Yao, I. Nurul Huda, Z.-W. Wang   +5 more
doaj   +1 more source

Jupiter Science Enabled by ESA's Jupiter Icy Moons Explorer. [PDF]

Space Sci Rev, 2023
Fletcher LN, Cavalié T, Grassi D, Hueso R, Lara LM, Kaspi Y, Galanti E, Greathouse TK, Molyneux PM, Galand M, Vallat C, Witasse O, Lorente R, Hartogh P, Poulet F, Langevin Y, Palumbo P, Gladstone GR, Retherford KD, Dougherty MK, Wahlund JE, Barabash S, Iess L, Bruzzone L, Hussmann H, Gurvits LI, Santolik O, Kolmasova I, Fischer G, Müller-Wodarg I, Piccioni G, Fouchet T, Gérard JC, Sánchez-Lavega A, Irwin PGJ, Grodent D, Altieri F, Mura A, Drossart P, Kammer J, Giles R, Cazaux S, Jones G, Smirnova M, Lellouch E, Medvedev AS, Moreno R, Rezac L, Coustenis A, Costa M.   +49 more
europepmc   +1 more source

Astrometry with the 5-km Radio Telescope [PDF]

Monthly Notices of the Royal Astronomical Society, 1973
M. Ryle, B. Elsmore
openaire   +1 more source

Radio Astrometry at 24 and 43 GHz

, 2005
We describe the goals and initial results of a collaboration formed to survey extragalactic objects at radio frequencies of 24 and 43 GHz. This survey is for extending the International Celestial Reference Frame (ICRF) that is the current coordinate system for astrometry and which is the angular inertial frame of deep space navigation.
Lanyi, G., Boboltz, D., Charlot, P., Fey, A., Fomalont, E., Gordon, D., Jacobs, C., Ma, C., Naudet, C., Sovers, O., Zhang, L.   +10 more
openaire   +1 more source

The Australian mixed-mode observing program. [PDF]

J Geod, 2022
McCallum L, Chin Chuan L, Krásná H, McCallum J, Böhm J, McCarthy T, Gruber J, Schartner M, Quick J, Rogers A.   +9 more
europepmc   +1 more source

Improving Source Positions in the OCARS Catalog: A First Approach

The Astronomical Journal
Optical Characteristics of Astrometric Radio Sources (OCARS) is a compiled catalog of various additional data associated with astrometric radio sources whose coordinates have been determined from very long baseline interferometry observations.
Zinovy Malkin
doaj   +1 more source

A repeating fast radio burst associated with a persistent radio source. [PDF]

Nature, 2022
Niu CH, Aggarwal K, Li D, Zhang X, Chatterjee S, Tsai CW, Yu W, Law CJ, Burke-Spolaor S, Cordes JM, Zhang YK, Ocker SK, Yao JM, Wang P, Feng Y, Niino Y, Bochenek C, Cruces M, Connor L, Jiang JA, Dai S, Luo R, Li GD, Miao CC, Niu JR, Anna-Thomas R, Sydnor J, Stern D, Wang WY, Yuan M, Yue YL, Zhou DJ, Yan Z, Zhu WW, Zhang B.   +34 more
europepmc   +1 more source