Results 21 to 30 of about 3,814,279 (400)
Treatment planning with a 2.5 MV photon beam for radiation therapy
Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022 Abstract Purpose The shallow depth of maximum dose and higher dose fall‐off gradient of a 2.5 MV beam along the central axis that is available for imaging on linear accelerators is investigated for treatment of shallow tumors and sparing the organs at risk (OARs) beyond it.
Navid Khaledi +5 more
wiley +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
Correlations of Orbital Elements for Visual Double Stars [PDF]
Serbian Astronomical Journal, 2010 In this paper, the authors examine the dependence of correlation coefficients of orbital elements on the length of the orbital arc covered by measurements, on measurements of different accuracies, and on the number of measurements.
Milic, I. S., Cvetkovic, Z.
doaj +3 more sources
Precise orbital elements, masses and parallax of the spectroscopic–interferometric binary HD 26441 [PDF]
, 2017 The orbit of the visual-speckle binary A 2801 (HD 26441) was calculated independently of the previously published double-lined spectroscopic solution, obtaining similar values for the common orbital elements.
J. Docobo +3 more
semanticscholar +1 more source
Necessary condition for temporary asteroid capture
Open Astronomy, 2023 Asteroid capture holds great significance in understanding the origins of asteroids, the source of life, and the exploration of planetary mineral resources.
Bao Changchun, Li Zhijie, Wang Xianyu
doaj +1 more source
Catalogue of comets passing through perihelion in 2015
Вісник Астрономічної школи, 2014 The catalog of 76 comets, passing the perihelion of its orbit in 2015. The catalog includes tables with circumstances of the passage of comets through perihelion, the elements of their orbits, and data concerning the discovery of comets.
K. I. Churyumov
doaj +1 more source
Approximations for Secular Variation Maxima of Classical Orbital Elements under Low Thrust
Mathematics, 2023 The reachability assessment of low-thrust spacecraft is of great significance for orbital transfer, because it can give a priori criteria for the challenging low-thrust trajectory design and optimization.
Zhaowei Wang, Lin Cheng, Fanghua Jiang
doaj +1 more source
Osculating Keplerian Elements for Highly Non-Keplerian Orbits [PDF]
, 2017 This paper presents a mapping between the elements of highly non-Keplerian orbits and classical orbital elements. Three sets of elements are discussed and mappings are derived in closed, analytical form for both the direct and inverse problem. Advantages
Ceriotti, Matteo +2 more
core +2 more sources
Catalogue of comets passing through perihelion in 2016
Вісник Астрономічної школи, 2015 A catalog of comets that pass the perihelion in 2016 is made. 69 comets will pass through perihelion in 2016: 17 short-period comets will pass the perihelion for the second time and we need a confirmation of these transits, and the 46 “old” short-period ...
K. I. Churyumov
doaj +1 more source
Calculation Mars – Earth distance and Mars orbital elements with Julian date
Iraqi Journal of Physics, 2023 In this paper, the Mars orbital elements were calculated. These orbital elements—the major axis, the inclination (i), the longitude of the ascending node (W), the argument of the perigee (w), and the eccentricity (e)—are essential to knowing the size ...
Atared Y. Qahtan
doaj +1 more source