Results 11 to 20 of about 34,671 (262)
Ephemeris of variables of the Algol-type
The Astronomical Journal, 1895 Paul S. Yendell
openalex +3 more sources
Daylight Observations of Venus with Naked Eye in the Goryeosa [PDF]
Journal of Astronomy and Space Sciences, 2017 In this paper, we investigate the observations of Venus in daytime that are recorded in the Goryeosa (History of the Goryeo Dynasty, A.D. 918-1392). There are a total of 167 accounts of such observations in this historical book, spanning a period of ...
Ki-Won Lee
doaj +1 more source
Prediction of Communication Outage Period between Satellite and Earth station Due to Sun Interference [PDF]
Journal of Astronomy and Space Sciences, 2010 We developed a computer program to predict solar interference period. To calculate Sun‘s position, we used DE406 ephemerides and Earth ellipsoid model. The Sun‘s position error is smaller than 10arcsec. For the verification of the calculation, we used
Yongjun Song +3 more
doaj +1 more source
Ten Years of VIIRS On-Orbit Geolocation Calibration and Performance
Remote Sensing, 2022 The first innovative Visible Infrared Imaging Radiometer Suite (VIIRS) sensor aboard the Suomi National Polar-orbiting Partnership (SNPP) satellite has been in operation for 10 years since its launch on 28 October 2011. The second VIIRS sensor aboard the
Guoqing Lin +4 more
doaj +1 more source
Development of Kinematic Ephemeris Generator for Korea Pathfinder Lunar Orbiter (KPLO)
Journal of Astronomy and Space Sciences, 2020 This paper presents a kinematic ephemeris generator for Korea Pathfinder Lunar Orbiter (KPLO) and its performance test results. The kinematic ephemeris generator consists of a ground ephemeris compressor and an onboard ephemeris calculator.
Min-Sup Song +3 more
doaj +1 more source
Remote Sensing, 2021 With the rapid development and gradual perfection of GNSS in recent years, improving the real-time service performance of GNSS has become a research hotspot. In GNSS single-point positioning, broadcast ephemeris is used to provide a space–time reference.
Hanlin Chen +5 more
doaj +1 more source
Effect of Ephemeris on Pulsar Timing and Navigation Accuracy Based on X-ray Pulsar Navigation-I Data
Universe, 2022 Solar system ephemeris is very important for pulsar timing and navigation. In order to explore the effect of different precision ephemerides on X-ray pulsar timing and navigation, the differences between timing and navigation results with four JPL ...
Yongtao Deng, Shuanggen Jin
doaj +1 more source
New Data on the Eclipsing Binary V1848 Ori and Improved Orbital and Light Curve Solutions
Open Astronomy, 2020 New observations of the eclipsing binary system V1848 Ori were carried out using the V filter resulting in a determination of new times of minima and new ephemeris were obtained.
Davoudi Fatemeh +13 more
doaj +1 more source
Systematics of planetary ephemeris reference frames inferred from pulsar timing astrometry [PDF]
A&A 674, A187 (2023), 2023 This study aims to investigate the systematics in planetary ephemeris reference frames through pulsar timing observations. We used the published data sets from several pulsar timing arrays and performed timing analyses for each pulsar using different planetary ephemerides retrieved from the Jet Propulsion Laboratory's Development Ephemeris (DE ...
arxiv +1 more source