Results 81 to 90 of about 31,207 (206)

A Bayesian framework for astrometry in a sparse star field and its application to Triton observations

Astronomy & Astrophysics
Context. The Gaia DR3 catalog significantly improves ground-based astrometric precision for natural satellites, largely because sufficient reference stars with high-precision positions are typically available within an object’s field.
Fang X. Q., Peng Q. Y., Lu X., Lin H., Zheng Z. J.   +4 more
doaj   +1 more source

The Power of (Near) Simultaneous Multi-Frequency Observations for mm-VLBI and Astrometry

Galaxies, 2017
Simultaneous or near-simultaneous observations at multiple frequency bands have the potential to overcome the fundamental limitation imposed by the atmospheric propagation in mm-VLBI observations.
María J. Rioja, Richard Dodson, José L. Gómez, Sol N. Molina, Taehyun Jung, Bong Won Sohn   +5 more
doaj   +1 more source

Gaia DR2 Distances to Planetary Nebulae

Galaxies, 2020
The aim of this work is to examine distances to planetary nebulae (PNe) together with other properties that were derived from them, using the astrometry of Gaia Data Release 2 (DR2).
Iker González-Santamaría, Minia Manteiga, Arturo Manchado, Ana Ulla, Carlos Dafonte   +4 more
doaj   +1 more source

Gaia and VLT astrometry of faint stars: Precision of Gaia DR1 positions and updated VLT parallaxes of ultracool dwarfs

, 2017
We compared positions of the Gaia first data release (DR1) secondary data set at its faint limit with CCD positions of stars in 20 fields observed with the VLT/FORS2 camera.
Lazorenko, P. F., Sahlmann, J.
core   +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

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

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source

Exomoon search with VLTI/GRAVITY around the substellar companion HD 206893 B

Astronomy & Astrophysics
Context. This study presents the first application of high-precision astrometry to search for exomoons around substellar companions, as this field remains largely unexplored. Aims.
Kral Q., Wang J., Kammerer J., Lacour S., Malin M., Winterhalder T., Charnay B., Perrot C., Huet P., Abuter R., Amorim A., Balmer W. O., Benisty M., Berger J.-P., Beust H., Blunt S., Boccaletti A., Bonnefoy M., Bonnet H., Bordoni M. S., Bourdarot G., Brandner W., Cantalloube F., Caselli P., Chauvin G., Chavez A., Chomez A., Choquet E., Christiaens V., Clénet Y., Coudé du Foresto V., Cridland A., Davies R., Dembet R., Dexter J., Drescher A., Duvert G., Eckart A., Eisenhauer F., Förster Schreiber N. M., Garcia P., Garcia Lopez R., Gardner T., Gendron E., Genzel R., Gillessen S., Girard J. H., Grant S., Haubois X., Henning Th., Hinkley S., Hippler S., Houllé M., Hubert Z., Jocou L., Keppler M., Kervella P., Kreidberg L., Kurtovic N. T., Lagrange A.-M., Lapeyrère V., Le Bouquin J.-B., Lutz D., Maire A.-L., Mang F., Marleau G.-D., Mérand A., Mollière P., Monnier J. D., Mordasini C., Mouillet D., Nasedkin E., Nowak M., Ott T., Otten G. P. P. L., Paladini C., Paumard T., Perraut K., Perrin G., Pfuhl O., Pourré N., Pueyo L., Ribeiro D. C., Rickman E., Rustamkulov Z., Shangguan J., Shimizu T., Sing D., Stadler J., Stolker T., Straub O., Straubmeier C., Sturm E., Tacconi L. J., Vigan A., Vincent F., von Fellenberg S. D., Widmann F., Woillez J., Yazici S., Abd El Dayem K., Aimar N., Berdeu A., Correia C., Defrère D., Fabricius M., Feuchtgruber H., Foschi A., Hönig S. F., Joharle S., Laugier R., Lai O., Leftley J., Lopez B., Millour F., Montargès M., Morujão N., Nowacki H., Osorno J., Petrov R., Petrucci P. O., Rabien S., Robbe-Dubois S., Sadun Bordoni M., Sánchez Bermúdez J., Santos D., Sauter J., Scigliuto J., Soulez F., Subroweit M., Sykes C.   +130 more
doaj   +1 more source

Integrity Assessment and Verification Procedure of Angle-only Data for Low Earth Orbit Space Objects with Optical Wide-field PatroLNetwork (OWL-Net)

Journal of Astronomy and Space Sciences, 2019
The Optical Wide-field patroL-Network (OWL-Net) is a global optical network for Space Situational Awareness in Korea. The primary operational goal of the OWL-Net is to track Low Earth Orbit (LEO) satellites operated by Korea and to monitor the ...
Jin Choi, Jung Hyun Jo, Sooyoung Kim
doaj   +1 more source

Correlated and zonal errors of global astrometric missions: a spherical harmonic solution

, 2012
We propose a computer-efficient and accurate method of estimation of spatially correlated errors in astrometric positions, parallaxes and proper motions obtained by space and ground-based astrometry missions.
Berghea, C. T., Dorland, B. N., Dudik, R. P., Gaume, R. A., Hennessy, G. S., Makarov, V. V., Schmitt, H. R.   +6 more
core   +1 more source