نتایج جستجو برای: constellations and stars

تعداد نتایج: 16842763  

2003
Wolfgang Kienreich Vedran Sabol Michael Granitzer Frank Kappe Keith Andrews

This publication presents InfoSky, a system enabling exploration of large, hierarchically structured knowledge spaces. InfoSky employs a two-dimensional graphical representation with variable magnification, much like a real-world telescope, to visualise individual documents as stars, hierarchical structures as constellations, and the whole knowledge repository as a galaxy. Force-directed placem...

In this study, 1200 images and catalogues of M33 spiral galaxy taken by WFCAM camera at UKIRT telescope in J, H and K bands. Cross correlation methods were employed to identify stars in overlapping regions from among images taken in different dates. Careful astrometric and photometric analysis was made to calibrate stellar positions and magnitudes using their 2MASS near infra red survey. The fi...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

Co-orbital systems contain two or more bodies sharing the same orbit around a planet star. The best-known flavors of co-orbital are tadpoles (in which bodies' angular separations oscillate about L4/L5 Lagrange points $60^\circ$ apart) and horseshoes (with periodically exchanging orbital energy to trace out horseshoe shape in co-rotating frame). Here, we use N-body simulations explore parameter ...

2005
BRADLEY E. SCHAEFER Bradley E. Schaefer

The Farnese Atlas is a Roman statue depicting the Titan Atlas holding up a celestial globe that displays an accurate representation of the ancient Greek constellations (see Figures 1 and 2). This is the oldest surviving depiction of this set of the original Western constellations, and as such can be a valuable resource for studying their early development. The globe places the celestial fi gure...

صمدزادگان, فرهاد, حمیدی, معصومه,

Star identification is one of the most important stages in attitude determination with star trackers. This can be performed using matching algorithms between observed stars and a master star catalogue. The main challenge in this approach is to provide a fast and reliable identification algorithm that is sufficiently robust in different pointing views of the star tracker optical system in the sp...

Journal: :پژوهش فیزیک ایران 0
معصومه حمیدی m. hamidi department of surveying and geomatics engineering, university of tehran, iranگروه مهندسی نقشه برداری، پردیس دانشکده های فنی، دانشگاه تهران فرهاد صمدزادگان f. samadzadegan department of surveying and geomatics engineering, university of tehran, iranگروه مهندسی نقشه برداری، پردیس دانشکده های فنی، دانشگاه تهران

star identification is one of the most important stages in attitude determination with star trackers. this can be performed using matching algorithms between observed stars and a master star catalogue. the main challenge in this approach is to provide a fast and reliable identification algorithm that is sufficiently robust in different pointing views of the star tracker optical system in the sp...

M.Y. Rahimi Ardabili

The linear adiabatic pulsation-periods of Mira variable stars have been derived. Approximately 2701[1]models were calculated for M = 0.7 MΘ to 2 MΘ stars with radii from 180 RΘ to 340 RΘ and luminosities from 2800 LΘ to 10,000 LΘ. The chemical composition of all models is (X,Z) = (0.7,0.02). From the result of this study, linear relations on Luminosity-Period-Mass relationship and luminosity-pe...

Journal: :journal of sciences, islamic republic of iran 2003
m.y. rahimi ardabili

the linear adiabatic pulsation-periods of mira variable stars have been derived. approximately 2701[1]models were calculated for m = 0.7 mθ to 2 mθ stars with radii from 180 rθ to 340 rθ and luminosities from 2800 lθ to 10,000 lθ. the chemical composition of all models is (x,z) = (0.7,0.02). from the result of this study, linear relations on luminosity-period-mass relationship and luminosity-pe...

Journal: :Valuation studies 2021

The focus on situated practices in current valuation studies becomes an obstacle when situations are too narrowly defined, moments of treated as isolated events and especially the interconnectedness across social fields is neglected. In order to overcome these limitations, we propose concept constellations (Meier et al. 2016). Based literature distinguishes positions their relations, rules, inf...

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