Results 131 to 140 of about 41,139 (300)

Proceedings of the JPL seminar on uncertainties in the lunar ephemeris [PDF]

Conference on lunar theory and ephemeris ...
Mulholland, J. D.
core   +1 more source

Solar barycentric dynamics from a new solar-planetary ephemeris

Astronomy & Astrophysics, 2018
Aims. The barycentric dynamics of the Sun has increasingly been attracting the attention of researchers from several fields, due to the idea that interactions between the Sun’s orbital motion and solar internal functioning could be possible.
R. Cionco, D. Pavlov
semanticscholar   +1 more source

Nimbus 6 Doppler processing using the Fairbanks calibration platform [PDF]

A weighted least squares processor is examined. Research conducted in support of the NASA satellite aided Search and Rescue program is presented. An estimated NIMBUS 6 ephemeris, accurate to 1.5-2.5 km and 0.5-2.5 m/s relative to a reference orbit, is ...
Koch, D. W., Lefler, J. G.
core   +1 more source

The quest for stable circumbinary companions to post-common envelope sdB eclipsing binaries Does the observational evidence support their existence?

, 2018
Context. Period variations have been detected in a number of eclipsing close compact binary subdwarf B stars (sdBs) and these have often been interpreted as caused by circumbinary massive planets or brown dwarfs.
Faillace, G., Pulley, D., Smith, D., von Harrach, S., Watkins, A.   +4 more
core   +1 more source

Ephemeris-01

, 2019
Ephemeris_01 This is the first volume of the magazine Ephemeris. Ephemeris is a magazine, published on behalf of Physics Forum, Bharathidasan University, Tiruchirappalli. It contains but not limits to, the articles, poems and cartoons created by students of Physics, Bharathidasan University.
openaire   +2 more sources

The spin vector of Venus determined from Magellan data [PDF]

A control network of the north polar region of Venus has been established by selecting and measuring control points on full-resolution radar strips.
Chodas, P. W., Colvin, T. R., Davies, M. E., Rogers, P. G., Sjogren, W. L.   +4 more
core   +1 more source

Astrometric positions for 18 irregular satellites of giant planets from 23 years of observations

, 2015
The irregular satellites of the giant planets are believed to have been captured during the evolution of the solar system. Knowing their physical parameters, such as size, density, and albedo is important for constraining where they came from and how ...
Andrei, A. H., Arlot, J. -E., Assafin, M., Benedetti-Rossi, G., Braga-Ribas, F., Camargo, J. I. B., Desmars, J., Dias-Oliveira, A., Duchemin, Y., Gomes-Júnior, A. R., Lainey, V., Morgado, B. E., Neto, D. N. da Silva, Thuillot, W., Vieira-Martins, R.   +14 more
core   +2 more sources

Precise Orbit Determination of GPS Satellites for Real Time Applications [PDF]

Journal of Astronomy and Space Sciences, 2001
The accuracy of GPS applications is heavily dependent on the satellite ephemeris and earth orientation parameter. Specially applications like as the real time monitoring of troposphere and ionosphere require real time or predicted ephemeris and earth ...
Hyung-Chul Lim, Pli-Ho Park, Jong-Uk Park, Jung-Ho Cho, Yong-Won Ahn   +4 more
doaj  

A Search for Hierarchical Triples using Kepler Eclipse Timing

, 2012
We present the first results of a Kepler survey of 41 eclipsing binaries that we undertook to search for third star companions. Such tertiaries will periodically alter the eclipse timings through light travel time and dynamical effects.
Belyawsky, Claret, D. R. Gies, Devor, Diethelm, Eggleton, G. J. Peters, Guilbault, Hambleton, Hartman, Hoffman, Holman, J. A. Orosz, Kepler Mission Team, Kratter, Kreiner, Kreiner, Lee, Mason, Matt, Mayer, Miller, Mjaseth, Payne, Pigulski, Pribulla, Pribulla, Prša, R. A. Matson, Raghavan, S. J. Williams, S. M. Thomas, Slawson, Strohmeier, Terrell, Vesper, Welsh, Z. Guo, Zacharias, Zavala   +39 more
core   +1 more source

An Improved Orbital Ephemeris for Cygnus X-1 [PDF]

A&A, 343, 861, 1998
By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847+/-0.000018.days and then, by including the more recent radial velocities of LaSala et al.
arxiv