Results 41 to 50 of about 43,513 (282)

Observations of the Rigollet Comet from Korea and Japan [PDF]

Journal of Astronomy and Space Sciences, 2014
Since Rigollet first discovered a comet in 1939, many follow-up observations have been made, particularly in Europe. It is now known that the Rigollet comet is identical with the one observed by Herschel in 1788, and thus it is now called 35P/1939 O1 ...
Ki-Won Lee, Byeong-Hee Mihn, Young Sook Ahn, Bong-Gyu Kim   +3 more
doaj   +1 more source

Transit observations at the observatory in Grossschwabhausen: XO-1b and TrES-1 [PDF]

, 2008
We report on observations of transit events of the transiting planets XO-1b and TrES-1 with the AIU Jena telescope in Grossschwabhausen. Based on our IR photometry (in March 2007) and available transit timings (SuperWASP, XO and TLC-project-data) we ...
A. Koeltzsch, A. Seifahrt, Broeg, C. Broeg, J. Koppenhoefer, M. Hohle, M. Mugrauer, M. Vaňko, R. Neuhäuser, S. Raetz, T. Eisenbeiss, T. O. B. Schmidt, T. Roell   +12 more
core   +2 more sources

PERHITUNGAN DATA EPHEMERIS KOORDINAT MATAHARI MENGGUNAKAN ALGORITMA JEAN MEEUS HIGHER ACCURACY DAN KETERKAITANNYA DENGAN PENGEMBANGAN ILMU FALAK

Jurnal Ilmiah Islam Futura, 2017
Data of solar coordinate such as longitude and latitude of the ecliptic, declination, and right ascension are the data that are often involved in astronomical reckoning and practical islamic astronomy.
reza akbar
doaj   +1 more source

An influence of the covariance between single orbit parameters on the accuracy of observations of the pseudo-ranges and phase differences

Metrology and Measurement Systems, 2020
The possibilities to improve values of the satellite orbit elements by employing the pseudo-ranges and differences of carrier phase frequencies measured at many reference GPS stations are analysed. An improvement of orbit ephemeris is achieved by solving
Skeivalas Jonas, Paršeliūnas Eimuntas, Putrimas Raimundas, Šlikas Dominykas   +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 ...
G. Jiao, Shuli Song, Yangyang Liu, Ke Su, N. Cheng, Shengli Wang   +5 more
semanticscholar   +1 more source

A long‐term broadcast ephemeris model for extended operation of GNSS satellites

, 2021
GNSS positioning relies on orbit and clock information, which is predicted on the ground and transmitted by the individual satellites as part of their broadcast navigation message.
O. Montenbruck, P. Steigenberger, Moritz Aicher   +2 more
semanticscholar   +1 more source

Bartolomeu Lourenço de Gusmão: o primeiro cientista brasileiro

Revista Brasileira de Ensino de Física
Bartolomeu Lourenço de Gusmão foi o primeiro inventor e cientista brasileiro, célebre pela criação do balão a ar quente em 1709. Nos 300 anos de sua mais famosa invenção, este artigo apresenta uma nova biografia do fundador da Aerostática e um estudo ...
Rodrigo Moura Visoni, João Batista Garcia Canalle   +1 more
doaj   +1 more source

Performance Assessment of Non-Integer-Hour Data Blocks in BDS Broadcast Ephemeris

IEEE Access
Due to system anomalies, BeiDou navigation satellite system (BDS) sometimes updates the broadcast ephemeris at non-integral hours. The gross errors contained in the non-integer-hour data blocks of broadcast ephemeris will lead to the signal-in-space (SIS)
Jingjing Wang, Chao Zhou
doaj   +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

Updating the orbital ephemeris of Her X-1; rate of decay and eccentricity of the orbit

, 2009
We present an update of the orbital ephemeris of the binary X-ray pulsar Her X-1 and determine an improved value for the rate of orbital decay. In addition, we report the first measurement of the orbital eccentricity.
Bradt, Crampton, D'Souza, D. Klochkov, Deeter, Deeter, Deeter, Gerend, Giacconi, Holt, Howarth, J. Wilms, Kelley, Klochkov, Lampton, Leahy, Liller, Marsh, Nagase, Parmar, Parmar, R. Staubert, Reynolds, Rots, Ruderman, Shakura, Staubert, Staubert, Tananbaum, Ubertini, Vrtilek, Walter, Winkler   +32 more
core   +1 more source