Results 61 to 70 of about 1,106,314 (231)

On the HU Aquarii planetary system hypothesis

, 2012
In this work, we investigate the eclipse timing of the polar binary HU Aquarii that has been observed for almost two decades. Recently, Qian et al. attributed large (O-C) deviations between the eclipse ephemeris and observations to a compact system of ...
Beuermann, Klaus, Burwitz, Vadim, Gauza, Bartosz, Gozdziewski, Krzysztof, Haghighipour, Nader, Hinse, Tobias C., Kanbach, Gottfried, Maciejewski, Andrzej J., Nasiroglu, Ilham, Rau, Arne, Schwarz, Robert, Schwope, Axel D., Slonina, Mariusz, Slowikowska, Aga   +13 more
core   +1 more source

Non-detection of previously reported transits of HD 97658b with MOST photometry [PDF]

, 2012
The radial velocity-discovered exoplanet HD 97658b was recently announced to transit, with a derived planetary radius of 2.93 \pm 0.28 R_{Earth}. As a transiting super-Earth orbiting a bright star, this planet would make an attractive candidate for ...
Antoci, Victoria, Dragomir, Diana, Guenther, David B., Henry, Gregory W., Howard, Andrew W., Johnson, John A., Kuschnig, Rainer, Marcy, Geoffrey W., Matthews, Jaymie M., Moffat, Anthony F. J., Rowe, Jason F., Rucinski, Slavek M., Sasselov, Dimitar, Weiss, Werner W.   +13 more
core   +3 more sources

Simultaneous optical polarimetry and X-ray observations of the magnetic CV CP Tuc (AX J2315--592) [PDF]

, 1999
CP Tuc (AX J2315--592) shows a dip in X-rays which lasts for approximately half the binary orbit and is deeper in soft X-rays compared with hard X-rays. It has been proposed that this dip is due to the accretion stream obscuring the accretion region from
Buckley, David, Potter, Stephen, Ramsay, Gavin, Wheatley, Peter   +3 more
core   +3 more sources

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   +3 more sources

A Neural Network Model of Equatorial Electric Field Structures in the Inner Magnetosphere

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Enabled by state‐of‐the‐art electric field measurements from the Van Allen Probes and careful calibration of the high‐quality data, we developed the first machine‐learning based inner‐magnetosphere electric field model, which covers L = 2.5–6.0 within 20° ${}^{\circ}$ around the magnetic equator.
M. Hua, S. Tian, J. Bortnik, D. Ma, Y. Wang, L. R. Lyons, J. R. Wygant   +6 more
wiley   +1 more source

No variations in transit times for Qatar-1 b

, 2015
The transiting hot Jupiter planet Qatar-1 b was presented to exhibit variations in transit times that could be of perturbative nature. A hot Jupiter with a planetary companion on a nearby orbit would constitute an unprecedented planetary configuration ...
Aceituno, F. J., Dimitrov, D., Errman, R., Fernández, M., Gilbert, H., Kitze, M., Maciejewski, G., Neuhäuser, R., Ohlert, J., Pannicke, A., Puchalski, D., Raetz, St., Schmidt, J. -G., Seeliger, M.   +13 more
core   +1 more source

Reconstructing Magnetotail Reconnection Events Using Data Mining is Feasible and Repeatable

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 1, February 2026.
Abstract Recently, Stephens et al. (2023), https://doi.org/10.1029/2022ja031066 utilized a data mining (DM) algorithm, applied to 26 years of magnetospheric magnetometer observations coupled with a flexible formulation of the magnetospheric magnetic field, to reconstruct the global configuration of the magnetotail when the Magnetospheric MultiScale ...
G. K. Stephens, R. S. Weigel, M. I. Sitnov, N. A. Tsyganenko   +3 more
wiley   +1 more source

Assuring the Legacy of the CoRoT Planets

EPJ Web of Conferences, 2015
For the long-lasting impact of CoRoT’s planet findings, precise knowledge of the times of their transits is of vital importance for any future observing campaigns.
Deeg H.J., Klagyivik P., Alonso R., Hoyer S.   +3 more
doaj   +1 more source

Analysis and Assessment of BDS-2 and BDS-3 Broadcast Ephemeris: Accuracy, the Datum of Broadcast Clocks and Its Impact on Single Point Positioning

Remote Sensing, 2020
For the global ordinary users, the broadcast ephemeris plays important roles in positioning, navigation and timing (PNT) services. With the construction of a new generation of the BeiDou navigation satellite system (BDS), the development of BDS has ...
Guoqiang Jiao, Shuli Song, Yangyang Liu, Ke Su, Na Cheng, Shengli Wang   +5 more
doaj   +1 more source

Long term frequency stability analysis of the GPS NAVSTAR 6 Cesium clock [PDF]

, 1982
Time domain measurements, taken between the NAVSTAR 6 Spacecraft Vehicle (SV) and the Vandenberg Global Positioning System (GPS) Monitor Site, by a pseudo random noise receiver, were collected over an extended period of time and analyzed to estimate the ...
Buisson, J., Carson, C., Mccaskill, T. B., Stebbins, S.   +3 more
core   +1 more source