Results 31 to 40 of about 24,888 (220)

Estimating Satellite Navigation Broadcast Ephemeris via Inter-Satellite and Ground-to-Satellite Ranging

Engineering Proceedings, 2023
This paper investigates the potential of performing orbit determination directly in the Earth-fixed frame based on Inter-Satellite Ranging (ISR) measurements as primary observables, combined with Ground-to-Satellite Ranging (GSR) measurements from a ...
Andrea Testa, Grzegorz Michalak, Manuele Dassié, Karl Hans Neumayer, Gabriele Giorgi   +4 more
doaj   +1 more source

Orbit Determination with the Keplerian Integrals

, 2022
We review two initial orbit determination methods for too short arcs (TSAs) of optical observations of a solar system body. These methods employ the conservation laws of Kepler's problem, and allow to attempt the linkage of TSAs referring to quite far epochs, differing by even more than one orbital period of the observed object.
openaire   +2 more sources

The planets around NN Serpentis : still there [PDF]

, 2013
We present 25 new eclipse times of the white dwarf binary NN Ser taken with the high-speed camera ULTRACAM on the William Herschel Telescope and New Technology Telescope, the RISE camera on the Liverpool Telescope and HAWK-I on the Very Large Telescope ...
Applegate, Beuermann, Beuermann, Beuermann, Beuermann, Brinkworth, C. Caceres, C. M. Copperwheat, Chambers, Dai, Dhillon, Doyle, Dvorak, E. Breedt, Eastman, Foreman-Mackey, Gibson, Goździewski, Haefner, Haefner, Hinse, Hobbs, Horner, Horner, Horner, Horner, Kissler-Patig, Knigge, Lee, Lee, M. C. P. Bours, M. R. Schreiber, Malhotra, Mustill, Parsons, Parsons, Portegies Zwart, Potter, Press, Qian, Qian, Qian, Qian, S. G. Parsons, S. P. Littlefair, Steele, T. R. Marsh, V. S. Dhillon, Veras, Welsh, Wittenmyer, Wittenmyer, Wood, Zorotovic   +53 more
core   +4 more sources

Evidence for 9 planets in the HD 10180 system [PDF]

, 2012
We re-analyse the HARPS radial velocities of HD 10180 and calculate the probabilities of models with differing numbers of periodic signals in the data. We test the significance of the seven signals, corresponding to seven exoplanets orbiting the star, in
Barnes, Chib, Feroz, Gregory, Gregory, Gregory, Gregory, Haario, Kass, Lissauer, Lomb, Lovis, Lovis, M. Tuomi, Mayor, Mayor, Metropolis, Pepe, Scargle, Tuomi, Tuomi, Tuomi, Tuomi, Vogt, von Paris, Wordsworth   +25 more
core   +3 more sources

Ten Low Mass Companions from the Keck Precision Velocity Survey [PDF]

, 2001
Ten new low mass companions have emerged from the Keck precision Doppler velocity survey, with minimum (msini) masses ranging from 0.8 mjup to 0.34 msun. Five of these are planet candidates with msini < 12 mjup, two are brown dwarf candidates with msini ~
Charbonneau D., Debra A. Fischer, Dimitri Pourbaix, Duquennoy A., Fuhrmann K., Fuhrmann K., Geoffrey W. Marcy, Gregory Laughlin, Henry G. W., Kevin Apps, Perryman M. A. C., Perryman M. A. C., Prieto C. A., R. Paul Butler, Steven S. Vogt, Tinney C. G., Udry S., Vogt S. S.   +17 more
core   +2 more sources

Beyond Point Masses. II. Non-Keplerian Shape Effects Are Detectable in Several TNO Binaries

The Astronomical Journal
About 40 trans-Neptunian binaries (TNBs) have fully determined orbits with about 10 others being solved except for breaking the mirror ambiguity. Despite decades of study, almost all TNBs have only ever been analyzed with a model that assumes perfect ...
Benjamin C. N. Proudfoot, Darin A. Ragozzine, Meagan L. Thatcher, Will Grundy, Dallin J. Spencer, Tahina M. Alailima, Sawyer Allen, Penelope C. Bowden, Susanne Byrd, Conner D. Camacho, Gibson H. Campbell, Edison P. Carlisle, Jacob A. Christensen, Noah K. Christensen, Kaelyn Clement, Benjamin J. Derieg, Mara K. Dille, Cristian Dorrett, Abigail L. Ellefson, Taylor S. Fleming, N. J. Freeman, Ethan J. Gibson, William G. Giforos, Jacob A. Guerrette, Olivia Haddock, S. Ashton Hammond, Zachary A. Hampson, Joshua D. Hancock, Madeline S. Harmer, Joseph R. Henderson, Chandler R. Jensen, David Jensen, Ryleigh E. Jensen, Joshua S. Jones, Cameron C. Kubal, Jacob N. Lunt, Stephanie Martins, McKenna Matheson, Dahlia Maxwell, Timothy D. Morrell, McKenna M. Myckowiak, Maia A. Nelsen, Spencer T. Neu, Giovanna G. Nuccitelli, Kayson M. Reardon, Austin S. Reid, Kenneth G. Richards, Megan R. W. Robertson, Tanner D. Rydalch, Conner B. Scoresby, Ryan L. Scott, Zacory D. Shakespear, Elliot A. Silveira, Grace C. Steed, Christiana Z. Suggs, Garrett D. Suggs, Derek M. Tobias, Matthew L. Toole, McKayla L. Townsend, Kade L. Vickers, Collin R. Wagner, Madeline S. Wright, Emma M. A. Zappala   +62 more
doaj   +1 more source

Circular geodesics and thick tori around rotating boson stars

, 2015
Accretion disks play an important role in the evolution of their relativistic inner compact objects. The emergence of a new generation of interferometers will allow to resolve these accretion disks and provide more information about the properties of the
Gourgoulhon, E., Grandclément, P., Meliani, Z., Monceau-Baroux, R., Straub, O., Vincent, F. H.   +5 more
core   +3 more sources

Maximum Angular Separation Epochs for Exoplanet Imaging Observations [PDF]

, 2018
Direct imaging of exoplanets presents both significant challenges and significant gains. The advantages primarily lie in receiving emitted and, with future instruments, reflected photons at phase angles not accessible by other techniques, enabling the ...
Kane, Stephen R., Meshkat, Tiffany, Turnbull, Margaret C.   +2 more
core   +3 more sources

Effects of Galilean Loupes on Dental Students' Posture and Cavity Preparation Quality

European Journal of Dental Education, Volume 30, Issue 2, Page 639-643, May 2026.
ABSTRACT Objectives This study investigated the effect of different magnification levels of the Galilean system loupes on dental students' working posture and the quality of cavity preparations. Materials and Methods An experimental study was conducted, with the response variables being compliance with ergonomic posture requirements (measured using the
Júlia M. Pazos, Matheus M. Canonici, Patricia P. N. S. Garcia   +2 more
wiley   +1 more source

Design of the broadcast ephemerides for the Lunar Communication and Navigation Services system

Progress in Earth and Planetary Science
The last few years have brought extensive growth of interest in the Earth’s natural satellite—the Moon. The lunar surface, especially the surroundings of its south pole, is supposed to become a getaway for space exploration including Mars in the first ...
Grzegorz Bury, Radosław Zajdel, Krzysztof Sośnica   +2 more
doaj   +1 more source