Results 81 to 90 of about 41,651 (296)

Uncertainties in Ground‐Based Visual Double Star Measures—II Accuracy of Measures

Astronomische Nachrichten, EarlyView.
ABSTRACT Letchford and White 2025, Paper I, determined the uncertainties in ground‐based historic measures of double stars. In this paper, the accuracy of 26,205 ground‐based measures of 857 visual double stars, made since ∼$$ \sim $$1780, is determined relative to space‐based measures based on positions and proper motion from the HIPPARCOS (via ASCC ...
Graeme L. White, Roderick R. Letchford
wiley   +1 more source

A Refined Astrometric Approach Based on the Precision Premium and its Application to the Jupiter’s Satellite Himalia

The Astronomical Journal
Since the advent of Gaia catalog, positional precision of a ground-based telescope can be greatly improved by correction of more subtle errors, including positional biases induced by atmospheric turbulence, and some instrumental factors such as geometric
Z. J. Zheng, Q. Y. Peng, F. R. Lin, D. Li   +3 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

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Stellar occultations enable milliarcsecond astrometry for Trans-Neptunian objects and Centaurs [PDF]

Astronomy & Astrophysics, 2020
Context. Trans-Neptunian objects (TNOs) and Centaurs are remnants of our planetary system formation, and their physical properties have invaluable information for evolutionary theories.
F. Rommel, F. Braga-Ribas, J. Desmars, J. Camargo, J. L. Ortiz, B. Sicardy, R. Vieira-Martins, M. Assafin, P. Santos-Sanz, R. Duffard, E. Fern'andez-Valenzuela, J. Lecacheux, B. Morgado, G. Benedetti-Rossi, A. Gomes-Júnior, C. Pereira, D. Herald, W. Hanna, J. Bradshaw, N. Morales, J. Brimacombe, A. Burtovoi, T. Carruthers, J. Barros, M. Fiori, A. Gilmore, D. Hooper, K. Hornoch, C. Jacques, T. Janik, S. Kerr, P. Kilmartin, Jan Maarten Winkel, G. Naletto, D. Nardiello, V. Nascimbeni, J. Newman, A. Ossola, A. Pál, E. Pimentel, P. Pravec, S. Sposetti, A. Stechina, R. Sz'akats, Y. Ueno, L. Zampieri, J. Broughton, J. Dunham, D. Dunham, D. Gault, T. Hayamizu, K. Hosoi, E. Jehin, R. Jones, K. Kitazaki, R. Komvz'ik, A. Marciniak, A. Maury, H. Mikuvz, P. Nosworthy, J. F. Polleri, S. Rahvar, R. Sfair, P. Siqueira, C. Snodgrass, P. Sogorb, H. Tomioka, J. Tregloan-Reed, O. NacionalMCTIC, 77 R.GeneralJos'eCristino, Bairro Imperial de Sao Crist'ovao, R. Janeiro, Brazil, Federal University of Technology - Paran'a, Rua Sete de Setembro, 3165, Curitiba, L. LIneA, Inct do e-Universo, 77 RuaGal.Jos'eCristino, Institut Polytechnique des Sciences Avanc'ees Ipsa, 63 boulevard de Brandebourg, F-94200 Ivry-sur-Seine, France, Institut de M'ecanique C'eleste et de Calcul des 'Eph'em'erides, Imcce, Observatoire de Paris, P. university, Cnrs, Sorbonne Universit'es, 06 UPMCUnivParis, U. Lille, 77, Av. Denfert-Rochereau, F. Paris, Inst. de Astrof'isica de Andaluc'ia, Iaa-Csic, Glorieta de la Astronom'ia sn, 18012 Granada, Spain., Lesia, Universit'e Psl, Sorbonne Universit'e, U. Diderot, Sorbonne Paris Cit'e, 5. P. Janssen, 92190 Meudon, Observatorio do ValongoUFRJ, 43 LadeiraPedroAntonio, Florida Space Institute, U. Florida, 12354 Research Parkway, 1. Partnership, Orlando, Fl, Usa, U. -. S. P. S. University, Grupo de Dinamica Orbital e Planetologia, Cep 12516-410, Guaratinguet'a, Sp, International Occultation Timing Association, P. O. B. 423, Greenbelt, MD 20768, Trans - Tasman Occultation Alliance, Wellington PO Box 3181, N. Zealand., Canberra Astronomical Society, Canberra, act, Australia., Samford Valley Observatory, Queensland., Coral Towers Observatory, Cairns, Qld 4870, Centre of Studies, Activities for Space 'G. Colombo', U. Padova, 15 ViaVenezia, 35131, I. Padova, 5. vicolodell'Osservatorio, I. Padova, Italy, Jewel Box Observatory, 69 Falcon St, Bayview Heights Qld 4868, S. Observatory, Oliveira, D. Physics, A. '. Galilei, 8. ViaF.Marzolo, Padova, Mount John University Observatory, U. Canterbury, 59 P.O.Box, Lake Tekapo 7945, A. Institute, Academy of Sciences of the Czech Republic, Frivcova 298, 251 65 Ondvrejov, Czech Republic, Astronomical Association of Queensland, 5. C. Street, Pimpama Qld 4209, A. Univ., Cnes, Lam, Marseille, S. -. S. O. T. A. Switzerland, Swiss Astronomical Society, Switzerland., K. Observatory, Research Centre in Astronomy, Earth Sciences, 17 Konkoly-ThegeMikl'os'ut15-, 1121 Budapest, Hungary., E. University, D. O. Astronomy, 1A P'azm'anyP'eters'et'any, 1121 Budapest, Elte Eotvos Lor'and University, I. O. Physics, C. D. A. D. L. A. R. -. Caar, Reconquista, Argentina., Japan Occultation Information Network, Japan., Reedy Creek Observatory, G. Coast., S. Institute, U. Liege, All'ee du 6 aout, 19C, 4000 Liege, Belgium, Slovak Academy of Sciences, 059 60 Tatransk'a Lomnica, Slovakia, A. Institute, F. O. Physics, Adam Mickiewicz University, Poznán, Poland., S. Space, Chile., U. Ljubljana, Faculty of Mathematics, Physics, 19 Jadranska, 1000 Ljubljana, Slovenia., P. O. I. S. P. D. A. -. Opspa, Sharif University of Technology, P. O. Tehran, Iran, Institute for Astronomy, U. Edinburgh, R. Observatory, Edinburgh EH9 3HJ, Uk, Club d'astronomie Luberon Sud Astro, La Bastide des Jourdans, Centro de Astronom'ia, U. Antofagasta, Avenida U. de Antofagasta, 02800 Antofagasta   +229 more
semanticscholar   +1 more source

Simulation of CSST’s astrometric capability

Frontiers in Astronomy and Space Sciences, 2023
Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude
Zhen-Sen Fu, Zhen-Sen Fu, Zhao-Xiang Qi, Zhao-Xiang Qi, Shi-Long Liao, Shi-Long Liao, Xi-Yan Peng, Yong Yu, Yong Yu, Qi-Qi Wu, Qi-Qi Wu, Li Shao, You-Hua Xu   +12 more
doaj   +1 more source

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars [PDF]

, 2010
We apply the iterative MCS deconvolution method (ISMCS) to near-IR HST archives data of seven gravitationally lensed quasars currently monitored by the COSMOGRAIL collaboration: HE 0047-1756, RX J1131-1231, SDSS J1138+0314, SDSS J1155+6346, SDSS J1226 ...
Biggs, Bolton, Bradač, Brewer, Chantry, Chen, Claeskens, Cohn, Courbin, D. Sluse, Dai, Dalal, de Vaucouleurs, Eigenbrod, Eigenbrod, Evans, Faber, Fadely, Ferreras, Hagen, Inada, Jackson, Kassiola, Keeton, Keeton, Keeton, Keeton, Keeton, Keeton, Kochanek, Kochanek, Kochanek, Kochanek, Koopmans, Koopmans, Koopmans, Kovalev, Lagattuta, Lehár, MacLeod, Magain, Magain, Mao, McKean, Metcalf, Mittal, Momcheva, More, Morgan, Morgan, Ofek, P. Magain, Patnaik, Patnaik, Pindor, Porcas, Refsdal, Ros, Saha, Sluse, Sluse, Sluse, Sugai, V. Chantry, Vuissoz, Wisotzki, Wisotzki, Witt, Wucknitz, Yonehara, Yoo   +70 more
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

Bound Orbits and Epicyclic Motions around Renormalization Group Improved Schwarzschild Black Holes

Universe, 2022
We study timelike particles’ bound orbits around renormalization group improved Schwarzschild black holes (RGISBHs), which originate from renormalization group improvement of the Einstein–Hilbert action by using the running Newton constant.
Hou-Yu Lin, Xue-Mei Deng
doaj   +1 more source

Sub-Microarcsecond Astrometry with SIM-Lite: A Testbed-based Performance Assessment

, 2008
SIM-Lite is an astrometric interferometer being designed for sub-microarcsecond astrometry, with a wide range of applications from searches for Earth-analogs to determining the distribution of dark matter.
B. Nemati, Goullioud R., Goullioud R., M. Shao   +3 more
core   +1 more source