Results 91 to 100 of about 909 (203)

Optical positions of radio stars. I.

, 1995
. | The optical positions of 31 radio stars obtained from the observations with the photoelectric astrolabe at Yunnan Observatory are presented in this paper. These are all the stars in the astrometric catalogue of radio stars observable by our astrolabe.
Hu Hui, Li Dongming
core   +1 more source

A Radio Flaring, Chromospherically Inactive K Dwarf

The Astrophysical Journal
We 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, Scott D. Hyman, Michele L. Silverstein, Emil Polisensky, Evangelia Tremou, Simona Giacintucci, Hodari-Sadiki Hubbard-James, Jacinda Byam, Steve B. Howell, Robert F. Wilson, Matthew Lastovka, Tracy E. Clarke, Namir E. Kassim   +12 more
doaj   +1 more source

Measuring Titan’s rapid orbital expansion combining Cassini radio science normal points and astrometry

Astronomy & Astrophysics
Recent 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, Lainey Valery, Gomez Casajus Luis, Zannoni Marco, Tortora Paolo   +4 more
doaj   +1 more source

Comparison of Gaia DR2 Parallaxes of Stars with VLBI Astrometry

, 2019
We compare the parallaxes of stars from VLBI astrometry in the literature to those in the Gaia DR2 catalog. Our full sample contains young stellar objects, evolved AGB stars, pulsars, and other radio stars.
Reid,Mark J., Zhang,Bo, Zheng,Xingwu, Wang,Guangli, Xu,Shuangjing   +4 more
core   +1 more source

The Synergy between VLBI and Gaia astrometry

, 2018
With the publication of Gaia DR2, 1.3 billion stars now have public parallax and proper motion measurements. In this contribution, we compare the results for sources that have both optical and radio measurements, focusing on circumstellar masers.
Natarajan, Iniyan, Burns, R. A., Pihlstrom, Y., Vlemmings, Wouter, Loinard, L., Quiroga-Nu\uf1ez, L.H., Honma, Mareki, Immer, K., Nakagawa, A., Deane, R. P., van Langevelde, H. J., Sjouwerman, Lor\ue1nt Oliv\ue9r, Michael Rich, R.   +12 more
core   +1 more source

First Detection of CH3OD in Prestellar Cores

The Astrophysical Journal
The isotopic ratios of deuterated methanol derived around protostars are commonly used to infer the physical conditions under which they formed in the earlier prestellar stage.
Beatrice M. Kulterer, Asunción Fuente, Maria N. Drozdovskaya, Silvia Spezzano, Gisela Esplugues, David Navarro-Almaida, Marina Rodríguez Baras, Angèle Taillard, Karin Öberg   +8 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

87th Annual Meeting of the Meteoritical Society 2025: Abstracts

Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley   +1 more source

Precision Astrometry: From VLBI to Gaia and SKA

, 2011
For the past 20 years, VLBI has been unique in establishing celestial reference frames based on extragalactic objects and measuring motions and distances of objects within the Galaxy with unprecedented accuracies.
Patrick Charlot, Charlot, P.
core   +1 more source

Origin and Evolution of Enceladus's Tidal Dissipation. [PDF]

Space Sci Rev, 2023
Nimmo F, Neveu M, Howett C.
europepmc   +1 more source