Results 51 to 60 of about 22,593 (246)

Orbits of four double stars [PDF]

Serbian Astronomical Journal, 2006
We present orbits of four double stars. Orbits of stars WDS 23516+4205 = ADS 17050 and WDS 18239+5848 = ADS 11336 were calculated for the first time. Orbits of double stars WDS 02022+3643 = ADS 1613 and WDS 18443+3940 = ADS 11635 were revised.
Novaković B., Todorović N.
doaj   +1 more source

The quest for companions to post-common envelope binaries: I. Searching a sample of stars from the CSS and SDSS

, 2012
As part of an ongoing collaboration between student groups at high schools and professional astronomers, we have searched for the presence of circum-binary planets in a bona-fide unbiased sample of twelve post-common envelope binaries (PCEBs) from the ...
A. Hahn, A. L. Rochus Vogel, A. Secci, A.-L. Speck, Applegate, B. Rauch, Beuermann, Beuermann, Brinkworth, C. Zapros, Chen, D. Kindermann, F. Althoff, F. Küppers, F. Liebing, F. N. Habermann, F. Niederstadt, F. V. Hessman, For, Horner, J. Dette, J. Diese, J. Dubbert, J. Möllmanns, J. N. Kellerman, K. Beuermann, K. Hoppen, K.-H. Klapdohr, L. Wüllner, Lee, M. Debrah, M. Griemens, M. Horstmann, M. Lauser, M. Pawlowski, M. Sauer, M. Schweizer, N. Haustovich, Parsons, Parsons, Parsons, Pyrzas, Qian, Qian, Qian, R. Kietz, R. Schünecke, Rebassa-Mansergas, S. Bauer, S. Biriuk, S. Dreizler, S. Simons, T. Bollmann, T. Miosga, T. Möller, T. Nienaber, T.-O. Husser, Taam, Todoran, U. Backhaus, Zorotovic   +60 more
core   +1 more source

Assessment of the Generation of Traveling Ionospheric Disturbances by Solar Terminators

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract The generation of traveling ionospheric disturbances (TIDs) near solar terminators has been predicted, and several studies have reported the detection of TIDs associated with sunrise. However, there are also observations that do not show TID signatures at sunrise.
Hyosub Kil, Andrew K. Sun, Se‐Heon Jeong, Woo Kyoung Lee, Jeong‐Heon Kim, Jiyun Lee   +5 more
wiley   +1 more source

DETERMINATION OF THE EPHEMERIS ACCURACY FOR AJISAI, LAGEOS AND ETALON SATELLITES, OBTAINED WITH A SIMPLIFIED NUMERICAL MOTION MODEL USING THE ILRS COORDINATES

Odessa Astronomical Publications, 2013
This paper describes a simplified numerical model of passive artificial Earth satellite (AES) motion. The model accuracy is determined using the International Laser Ranging Service (ILRS) highprecision coordinates. Those data are freely available on http:
I. V. Kara
doaj   +1 more source

Pulse Profile Change Possibly Associated with a Glitch in an Anomalous X-Ray Pulsar 4U 0142+61

, 2004
We report a glitch-like pulse frequency deviation from the simple spin-down law in an anomalous X-ray pulsar (AXP) 4U 0142+61 detected by ASCA observations. We also found a significant pulse profile change after the putative glitch. The glitch parameters
Hellier C., Mikio Morii, Nobuyuki Kawai, Noriaki Shibazaki, van Paradijs J.   +4 more
core   +1 more source

Combining Van Allen Probes and CubeSat Observations to Estimate Storm‐Time Maximum Outer Radiation Belt Electron Fluxes

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Understanding and forecasting extreme radiation belt electron fluxes has been a major goal in space weather since their discovery in 1958. In this study, by combining electron flux data from multiple satellite missions in different orbits, including Van Allen Probes, Electron Losses and Fields Investigation, and Colorado Inner Radiation Belt ...
Man Hua, Jacob Bortnik, Yangyang Shen, Vassilis Angelopoulos, Yang Mei, Xinlin Li, Colin Wilkins   +6 more
wiley   +1 more source

Lunar reference systems and their realisations using INPOP ephemerides

Astronomy & Astrophysics
Context. The definition of a reference system plays a crucial role in quantifying geodetic effects and in surface body cartography. Today, the development and specification of the lunar reference system is stimulated by future space missions, some of ...
Rambaux N., Fienga A., Seyffert Y., Sośnica K., Kaitheri A., Laskar J., Gastineau M., Baguet D.   +7 more
doaj   +1 more source

Calculation of the Uncertainties in the Planetary Precessions with the Recent EPM2017 Ephemerides and their Use in Fundamental Physics and Beyond

, 2019
I tentatively compile the formal uncertainties in the secular rates of change of the orbital elements $a,~e,~I,~\Omega$ and $\varpi$ of the planets of the solar system from the recently released formal errors in $a$ and the nonsingular elements $h,~k,~p$
Iorio, Lorenzo
core   +1 more source

Uncertainties in Historic Visual Double Star Measures—III Accurate Calibration Pairs

Astronomische Nachrichten, Volume 346, Issue 10, December 2025.
ABSTRACT Based on space‐based positions and proper motions, we present accurate rectilinear elements for 857 double star pairs over the celestial sphere. These elements allow for the computation of precision ephemeris Position Angles and Separations of these pairs.
Roderick R. Letchford, Graeme L. White
wiley   +1 more source

Boosting decision trees for the selection of main belt asteroids in planetary ephemerides: An alternative model

Astronomy & Astrophysics
Context. One of the main bottlenecks in assessing the accuracy of the Mars orbit is the unknown value of the asteroids in the main asteroid belt. A modeling with 343 asteroids as point masses is used today, with the relative masses fit to observational ...
Mariani Vincenzo, Fienga Agnès, Murray Zachary, Gastineau Mickaël, Laskar Jacques   +4 more
doaj   +1 more source