Results 11 to 20 of about 145,824 (331)

Retrieval of the Stratospheric Density by the Star Occultation

Aerospace, 2023
The navigation by the stellar refraction is important for a LEO (Low-Earth-Orbit) satellite, especially in a GNSS (Global Navigation Satellite System)-denied environment, since it is totally autonomous.
Kedong Wang, Zhennan Li, Shaoxiong Zhang
doaj   +1 more source

COSMIC‐2 Radio Occultation Constellation: First Results

Geophysical Research Letters, 2020
Initial data from the Formosa Satellite‐7/Constellation Observing System for Meteorology Ionosphere and Climate (FORMOSAT‐7/COSMIC‐2, hereafter C2), a recently launched equatorial constellation of six satellites carrying advanced radio occultation ...
W. Schreiner, J. Weiss, R. Anthes, J. Braun, V. Chu, J. Fong, D. Hunt, Y. Kuo, T. Meehan, W. Serafino, J. Sjoberg, S. Sokolovskiy, E. Talaat, T. Wee, Z. Zeng   +14 more
semanticscholar   +1 more source

The COSMIC/FORMOSAT-3 Radio Occultation Mission after 12 Years: Accomplishments, Remaining Challenges, and Potential Impacts of COSMIC-2

Bulletin of The American Meteorological Society - (BAMS), 2020
Launched in 2006, the Formosa Satellite Mission 3–Constellation Observing System for Meteorology, Ionosphere and Climate (FORMOSAT-3/COSMIC) was the first constellation of microsatellites carrying global positioning system (GPS) radio occultation (RO ...
S. Ho, R. Anthes, C. Ao, S. Healy, A. Horányi, D. Hunt, A. Mannucci, N. Pedatella, W. Randel, A. Simmons, A. Steiner, F. Xie, X. Yue, Z. Zeng   +13 more
semanticscholar   +1 more source

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation [PDF]

Nature, 2017
Haumea—one of the four known trans-Neptunian dwarf planets—is a very elongated and rapidly rotating body. In contrast to other dwarf planets, its size, shape, albedo and density are not well constrained. The Centaur Chariklo was the first body other than
J. Ortiz, P. Santos-Sanz, B. Sicardy, G. Benedetti-Rossi, D. Bérard, N. Morales, R. Duffard, F. Braga-Ribas, U. Hopp, C. Ries, V. Nascimbeni, V. Nascimbeni, F. Marzari, V. Granata, V. Granata, A. Pál, C. Kiss, T. Pribulla, R. Komžík, K. Hornoch, P. Pravec, P. Bacci, M. Maestripieri, L. Nerli, L. Mazzei, M. Bachini, F. Martinelli, G. Succi, F. Ciabattari, H. Mikuž, A. Carbognani, B. Gaehrken, S. Mottola, S. Hellmich, F. Rommel, E. Fernández-Valenzuela, A. C. Bagatin, S. Cikota, A. Cikota, J. Lecacheux, R. Vieira-Martins, J. Camargo, M. Assafin, F. Colas, R. Behrend, J. Desmars, E. Meza, A. Alvarez-Candal, W. Beisker, A. Gomes-Júnior, B. Morgado, F. Roques, F. Vachier, J. Berthier, T. Mueller, J. Madiedo, O. Unsalan, E. Sonbaş, N. Karaman, O. Erece, D. Koseoglu, T. Ozisik, S. Kalkan, Y. Guney, M. Niaei, O. Şatir, C. Yeşi̇lyaprak, Ç. Püsküllü, A. Kabas, O. Demircan, J. Alikakos, V. Charmandaris, G. Leto, J. Ohlert, J. Christille, R. Szakáts, A. Farkas, E. Varga-Verebélyi, G. Marton, A. Marciniak, P. Bartczak, T. Santana-Ros, M. Butkiewicz-Ba̧k, G. Dudziński, V. Alí-Lagoa, K. Gazeas, L. Tzouganatos, N. Paschalis, V. Tsamis, A. Sánchez‐Lavega, S. Pérez-Hoyos, R. Hueso, J. Guirado, V. Peris, R. Iglesias-Marzoa   +94 more
semanticscholar   +1 more source

The colibri telescope array for KBO detection through serendipitous stellar occultations: A technical description

Frontiers in Astronomy and Space Sciences, 2022
We present the technical design, construction and testing of the Colibri telescope array at Elginfield Observatory near London, Ontario, Canada. Three 50-cm telescopes are arranged in a triangular array and are separated by 110–160 m.
Michael J. Mazur, Stanimir Metchev, Stanimir Metchev, Rachel A. Brown, Rachel A. Brown, Ridhee Gupta, Richard Bloch, Tristan Mills, Emily Pass   +8 more
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starry: Analytic Occultation Light Curves [PDF]

, 2018
We derive analytic, closed form, numerically stable solutions for the total flux received from a spherical planet, moon, or star during an occultation if the specific intensity map of the body is expressed as a sum of spherical harmonics. Our expressions
R. Luger, E. Agol, D. Foreman-Mackey, David P. Fleming, J. Lustig-Yaeger, R. Deitrick   +5 more
semanticscholar   +1 more source

Evaluating the effect of four unknown parameters included in a latitudinal energy balance model on the habitability of exoplanets

Open Astronomy, 2020
Among different models for determining the habitable zone (HZ) around a star, a Latitudinal Energy Balance Model (LEBM) is very beneficial due to its parametricity which keeps a good balance between complexity and simulation time.
Bahraminasr Majid, Jafarzadeh S. Javad, Montazeri Fatemeh, Poro Atila, Sarabi Soroush   +4 more
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Manuels scolaires d’éducation à la citoyenneté au collège et problématique du développement durable, pour une analyse du curriculum prescrit d’instruction civique au Gabon [PDF]

Akofena, 2022
Résumé : La présente contribution se donne pour objectif d’interroger l’éducation à la citoyenneté au collège dans les établissements d’enseignement secondaire public.
Orphée Martial SOUMAHO MAVIOGA & Dany Daniel BEKALE
doaj  

First Galileo Single-Frequency Occultation Process and Precision Analysis of FengYun3E

Remote Sensing, 2023
This article proposes a single-frequency occultation method whose core is the reconstruction of a second frequency measurement. We process the actual received Galileo E1 single-frequency occultation observation data of FengYun3E to meet the urgent need ...
Ming Yang, Xiangguang Meng, Haoran Tian, Yueqiang Sun, Qifei Du, Weihua Bai, Bowen Wang, Xianyi Wang, Peng Hu, Guangyuan Tan   +9 more
doaj   +1 more source

Impacts of Orbital and Constellation Parameters on the Number and Spatiotemporal Coverage of LEO-LEO Occultation Events

Remote Sensing, 2021
The development of small-satellite technologies allows the low Earth orbit intersatellite link (LEO-LEO) occultation method to observe the Earth’s atmosphere with global coverage and acceptable costs using electromagnetic signals, in which the L/X/K/M ...
Congliang Liu, Gottfried Kirchengast, Yueqiang Sun, Veronika Proschek, Xin Wang, Longfei Tian, Qifei Du, Weihua Bai, Chunjun Wu, Peng Hu, Guangyuan Tan   +10 more
doaj   +1 more source