Results 1 to 10 of about 32,875 (222)
Phoebe's orbit from ground-based and space-based observations [PDF]
, 2013 The ephemeris of Phoebe, the ninth satellite of Saturn, is not very accurate. Previous dynamical models were usually too simplified, the astrometry is heterogeneous and, the Saturn's ephemeris itself is an additionnal source of error.
Desmars, Josselin +4 more
core +13 more sources
TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties [PDF]
The Astrophysical Journal Supplement Series, 2023 A precise transit ephemeris serves as the premise for follow-up exoplanet observations. We compare TESS Object of Interest (TOI) transit timings of 262 hot Jupiters with the archival ephemeris and find 31 of them having TOI timing offsets, among which ...
Su-Su Shan +10 more
doaj +2 more sources
Updating the orbital ephemeris of Her X-1; rate of decay and eccentricity of the orbit [PDF]
, 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 +32 more
core +2 more sources
ALMA SOLAR EPHEMERIS GENERATOR [PDF]
Rudarsko-geološko-naftni Zbornik, 2019 An online software tool for the easy preparation of ephemerides of the solar surface features is presented. It was developed as a helper tool for the preparation of observations of the Sun with the Atacama Large Millimeter/submillimeter Array (ALMA), but
Ivica Skokić, Roman Brajša
doaj +3 more sources
A long-term optical and X-ray ephemeris of the polar EK Ursae Majoris [PDF]
, 2009 We searched for long-term period changes in the polar EK UMa using new optical data and archival X-ray/EUV data. An optical ephemeris was derived from data taken remotely with the MONET/N telescope and compared with the X-ray ephemeris based on Einstein,
A. D. Schwope +15 more
core +2 more sources
New light curves and ephemeris for the close eclipsing binary V963 PER [PDF]
arXiv, 2011 We have obtained CCD photometry in 2010-11 of V963 Per (=GSC3355 0394), which is a recently identified close binary star with unequal eclipse depths. The seven new eclipse timings yield an improved ephemeris, but we caution that secondary eclipse can be ...
Dirks, Clarissa +6 more
core +1 more source
The K2 and TESS Synergy. III. Search and Rescue of the Lost Ephemeris for K2's First Planet [PDF]
The Astronomical JournalK2-2 b/HIP 116454 b, the first exoplanet discovery by K2 during its Two-Wheeled Concept Engineering Test, is a sub-Neptune (2.5 ± 0.1 R _⊕ , 9.7 ± 1.2 M _⊕ ) orbiting a relatively bright ( K _S = 8.03) K-dwarf star on a 9.1 day period. Unfortunately, due
Erica Thygesen +15 more
doaj +2 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