Results 31 to 40 of about 6,397,764 (332)

Dwarf Novae in the Shortest Orbital Period Regime: II. WZ Sge Stars as the Missing Population near the Period Minimum [PDF]

, 2010
WZ Sge-type dwarf novae are characterized by long recurrence times of outbursts (~10 yr) and short orbital periods (
Kato, T., Nogami, D, Ohsugi, T., Uemura, M.   +3 more
core   +1 more source

DOP prediction over Egypt from SP3 file for long-term

Alexandria Engineering Journal, 2012
An important error source in satellite surveying deals with the geometry of the visible satellite constellation at the time of observation. This is similar to the situation in traditional surveys, where the geometry of the network of observed ground ...
Aly M. El-naggar
doaj   +1 more source

Orbital Decay in an Accreting and Eclipsing 13.7 Minute Orbital Period Binary with a Luminous Donor

The Astrophysical Journal Letters, 2023
We report the discovery of ZTF J0127+5258, a compact mass-transferring binary with an orbital period of 13.7 minutes. The system contains a white dwarf accretor, which likely originated as a post–common envelope carbon–oxygen (CO) white dwarf, and a warm
Kevin B. Burdge, Kareem El-Badry, Saul Rappaport, Tin Long Sunny Wong, Evan B. Bauer, Lars Bildsten, Ilaria Caiazzo, Deepto Chakrabarty, Emma Chickles, Matthew J. Graham, Erin Kara, S. R. Kulkarni, Thomas R. Marsh, Melania Nynka, Thomas A. Prince, Robert A. Simcoe, Jan van Roestel, Zach Vanderbosch, Eric C. Bellm, Richard G. Dekany, Andrew J. Drake, George Helou, Frank J. Masci, Jennifer Milburn, Reed Riddle, Ben Rusholme, Roger Smith   +26 more
doaj   +1 more source

Minimum Orbital Period of Precataclysmic Variables [PDF]

Astrophysical Journal, 2018
More than 20 precataclysmic variable (pre-CV) systems have now been discovered with very short orbital periods ranging from 250 minutes down to 68 minutes.
Lorne A. Nelson, J. Schwab, M. Ristić, S. Rappaport   +3 more
semanticscholar   +1 more source

The eccentric short-period orbit of the supergiant fast X-ray transient HD 74194 (=LM Vel) [PDF]

, 2015
Aims. We present the first orbital solution for the O-type supergiant star HD 74194, which is the optical counterpart of the supergiant fast X-ray transient IGR J08408-4503. Methods.
Alfaro, E. J., Apellániz, J. Maíz, Arias, J. I., Barbá, R. H., Gamen, R., Morrell, N. I., Sota, A., Walborn, N. R.   +7 more
core   +2 more sources

A Detailed Study of 2S 0114+650 with the RXTE [PDF]

, 2008
We present the results of a detailed study of the high mass X-ray binary 2S 0114+650 made with the pointed instruments onboard the Rossi X-ray Timing Explorer.
Aab, Apparao, Barlow, Blondin, Bonning, Chevalier, Corbet, Corral, Crampton, Crowther, Davies, De Luca, den Hartog, Ebisawa, Farrell, Farrell, Filippova, Finley, Finley, George, Gruber, Grundstrom, Haberl, Hall, Harding, Heindl, Hudec, Ikhsanov, Jahoda, Koenigsberger, Koenigsberger, Koenigsberger, Li, Masetti, Mattana, Meynet, Mukherjee, Nagase, Naik, Ogilvie, P. M. O'Neill, R. K. Sood, Reig, Rothschild, S. A. Farrell, S. Dieters, Schönherr, Sood, Soong, Taylor, Thompson, van Kerkwijk, Wang, Wasserman, Wen, White, Yamauchi   +56 more
core   +1 more source

A Method to Determine BeiDou GEO/IGSO Orbital Maneuver Time Periods

Sensors, 2019
Because there are different types of BeiDou constellations with participating geostationary orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites, the maneuvering frequency of BeiDou satellites is higher than that of other navigation systems ...
Zhiwei Qin, Guanwen Huang, Qin Zhang, Le Wang, Xingyuan Yan, Yanchao Kang, Xiaolei Wang, Shichao Xie   +7 more
doaj   +1 more source

Revisiting Orbital Evolution in HAT-P-2 b and Confirmation of HAT-P-2 c

The Astronomical Journal, 2023
One possible formation mechanism for Hot Jupiters is that high-eccentricity gas giants experience tidal interactions with their host star that cause them to lose orbital energy and migrate inwards.
Zoë L. de Beurs, Julien de Wit, Alexander Venner, David Berardo, Jared Bryan, Joshua N. Winn, Benjamin J. Fulton, Andrew W. Howard   +7 more
doaj   +1 more source

Orbital maneuver technology of temporary networked satellites for earth exploration

Xibei Gongye Daxue Xuebao, 2022
It is very difficult to achieve effective coverage of hot-spot target in a short time period by earth perturbation for orbital maneuver, because the coverage gap of the temporary multi-satellites network in certain period of time is too large.
ZHAO Jun, LI Wei, GAO Rui, ZHANG Guangde, ZHU Xiaopeng, ZHAN Yuequan   +5 more
doaj   +1 more source

Orbital Index in Human Dry Skulls of East Indian Origin: A Cross-sectional Study [PDF]

International Journal of Anatomy Radiology and Surgery, 2023
Introduction: Orbital index demonstrates the proportion of the orbital length to the orbital width and varies with race, geographic region, and ethnicity.
Sayantan Das , Anupam Khalkho, PaParamita Mukhopad hyay, PaParijat Mukherjee   +3 more
doaj   +1 more source