Results 71 to 80 of about 6,728 (225)

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

A DIFFERENTIAL CATALOGUE OF RIGHT ASCENSIONS OF 263 RRS2 STARS OBTAINED FROM OBSERVATIONS MADE WITH THE ODESSA MERIDIAN CIRCLE IN 1990-1993

Odessa Astronomical Publications, 2017
This catalogue contains the results of 1321 right ascensions observations of 2dj Radio References Stars obtained al Odessa with the Repsold transit circle in 1990-1993.
A. P. Chelombit'ko
doaj   +1 more source

Astrometry And Data Centers [PDF]

Symposium - International Astronomical Union, 1988
SummaryThe paper tries to provide some background to answer the problem if old astrometric data should be stored. The cases of the AC and the CdC are examined, as well as the storage of some more recent catalogues on optical disc. Finally the necessity of producing general catalogues (of the SAO type) for non-astrometrists is underlined, to satisfy the
openaire   +1 more source

The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini, Virginio Oldani, Andrea Farina, Paolo Ochner, Andrea Reguitti, Luigi R. Bedin, Jean Gabriel Bosch, Erik Bryssinck, Roberto Crippa, Stéphan Gaumont‐Guay, Carl W. Hergenrother, Joel Nicolas, Ivo Scheggia   +12 more
wiley   +1 more source

The Hubble Missing Globular Cluster Survey

Astronomy & Astrophysics
The Hubble Missing Globular Cluster Survey has secured high-quality astro-photometric data in two bands for 34 clusters never observed with HST. When combined with Gaia astrometry, this dataset enables the investigation of the bulk motion and the ...
Rosignoli L., Libralato M., Pascale R., Massari D., Dalessandro E., Ceccarelli E., Baumgardt H., Bellazzini M., Bellini A., Aguado-Agelet F., Cassisi S., Monelli M., Mucciarelli A., Pancino E., Salaris M., Dodd E., Ferraro F. R., Lanzoni B.   +17 more
doaj   +1 more source

Astrometry of Circumstellar Masers [PDF]

, 2003
8 pages, 2 figures, to appear in "Mass-losing Stars and their Circumstellar Matter", eds Y. Nakada & M.
van Langevelde, H. J., Vlemmings, W. H. T.   +1 more
openaire   +2 more sources

Astrometry

, 2007
The special VLBI techniques used to obtain accurate absolute or relative positions of radio sources are discussed. Contents 19.1 Types of Astrometry : : : : : : : : : : : : : : : : : : : : : : : 364 19.1.1 Absolute Astrometry : : : : : : : : : : : : :
Edward Fomalont
core  

A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber, Maximilian Halenke, Aakash Bhat, Veronika Schaffenroth   +3 more
wiley   +1 more source

The First Look of Gaia: Daily data quality and instrument health assessment with automated early warnings

Astronomy & Astrophysics
Context. The ESA Gaia mission is a 10+ year astrometric whole-sky scan,demanding consistent data quality over the whole timespan of operations Aims. The Gaia First Look (FL) is a system whose aim is monitoring the data quality to identify problems, which
Altmann M., Balog Z., Löffler W., Bastian U., Biermann M., Sagrista Selles A., Davidson M., Rowell N., Serpell E., Abreu Aramburu A., Brüsemeister T., Crowley C., Hauser M., Jordan S., Martín-Fleitas J., Mora A., del Peloso E. F., Stampa U.   +17 more
doaj   +1 more source

Towards high-precision ground-based astrometry: Differential delay lines for PRIMA@VLTI

, 2005
Deriving unambiguously the orbital parameters and masses of extrasolar planets requires at least 2-dimensional information on either the positions or motions of the planet directly (currently out of reach) or, indirectly, of the host star.
Launhardt, R., Bakker, E., Queloz, D., Hanenburg, H., Quirrenbach, H., de Jong, J., de Jong, J. A., Delplancke, F., Henning, Th., Bakker, E. J., Michellod, Y., Setiawan, J., Glindemann, A., Mathar, R. J., Pepe, F., Dändliker, R., Ségransan, D., Weber, L., Köhler, R., Fleury, M., Pragt, J., Sosnowska, D., Bizenberger, P., Baumeister, H., Jaffe, W., Venema, L., Mathar, R., Wüthrich, R., Murakawa, K., Maire, C., Tubbs, R., Reffert, S., Bleuler, H., Wagner, K., Le Poole, R. S., Sache, L., Gillet, D., Müllhaupt, P., le Poole, R., Derie, F., Tubbs, R. N., Quirrenbach, A., Scherler, O.   +42 more
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