Results 21 to 30 of about 12,904 (207)
Original Research by Young Twinkle Students (ORBYTS): ephemeris refinement of transiting exoplanets [PDF]
Monthly notices of the Royal Astronomical Society, 2020 We report follow-up observations of transiting exoplanets that have either large uncertainties (>10 min) in their transit times or have not been observed for over 3 yr.
B. Edwards +62 more
semanticscholar +1 more source
SEA WAVE DIAGNOSTICS BY RADIO EMISSIONS FROM ARTIFICIAL EARTH SATELLITES IN DIFFERENT FREQUENCY BANDS [PDF]
Radio Physics and Radio AstronomySubject and Purpose. The present paper is concerned with sea wave diagnostics by signals from artificial satellites in a bistatic radar scheme using the grazing radio-wave propagation and a diffuse component of the signal reflected off the sea surface ...
V. B. Zamaraev +2 more
doaj +1 more source
TraMoS: V. Updated ephemeris and multi-epoch monitoring of the hot Jupiters WASP-18Ab, WASP-19b, and WASP-77Ab [PDF]
, 2020 We present 22 new transit observations of the exoplanets WASP-18Ab, WASP-19b, and WASP-77Ab, from the Transit Monitoring in the South (TraMoS) project. We simultaneously model our newly collected transit light curves with archival photometry and radial ...
P. Cortés-Zuleta +7 more
semanticscholar +1 more source
Excluding Primordial Black Holes as Dark Matter Based on Solar System Ephemeris [PDF]
Research Notes of the AASCurrent cosmological constraints allow primordial black holes to constitute dark matter in the mass range of 1018–1022 g. I show that a major portion of this logarithmic window can be ruled-out based on the solar system ephemeris, given that the external
Abraham Loeb
semanticscholar +1 more source
Validation of Geostationary Earth Orbit Satellite Ephemeris Generated
Journal of Astronomy and Space Sciences, 2018 This study presents the generation and accuracy assessment of predicted orbital ephemeris based on satellite laser ranging (SLR) for geostationary Earth orbit (GEO) satellites.
Hyungjik Oh +5 more
doaj +1 more source
Analysis of Solar and Lunar Motions in the Seonmyeong Calendar
Journal of Astronomy and Space Sciences, 2019 We investigate solar and lunar motions in the Seonmyeong (SM) calendar that was compiled by Xu, Ang of the Tang dynasty (A.D. 618-907) in China and used for 71 years from 822 to 892.
Ki-Won Lee
doaj +1 more source
Sensors, 2020 At present, Global Position System (GPS) navigation ephemeris mainly broadcasts satellite orbits with meter-level precision for standard point positioning and precise relative positioning. With the rapid development of real-time precise point positioning
Dehai Li +5 more
doaj +1 more source
Observations of the Rigollet Comet from Korea and Japan [PDF]
Journal of Astronomy and Space Sciences, 2014 Since Rigollet first discovered a comet in 1939, many follow-up observations have been made, particularly in Europe. It is now known that the Rigollet comet is identical with the one observed by Herschel in 1788, and thus it is now called 35P/1939 O1 ...
Ki-Won Lee +3 more
doaj +1 more source
Metrology and Measurement Systems, 2020 The possibilities to improve values of the satellite orbit elements by employing the pseudo-ranges and differences of carrier phase frequencies measured at many reference GPS stations are analysed. An improvement of orbit ephemeris is achieved by solving
Skeivalas Jonas +3 more
doaj +1 more source
Bartolomeu Lourenço de Gusmão: o primeiro cientista brasileiro
Revista Brasileira de Ensino de FísicaBartolomeu Lourenço de Gusmão foi o primeiro inventor e cientista brasileiro, célebre pela criação do balão a ar quente em 1709. Nos 300 anos de sua mais famosa invenção, este artigo apresenta uma nova biografia do fundador da Aerostática e um estudo ...
Rodrigo Moura Visoni +1 more
doaj +1 more source