Search Publications
Observations of Solar Type III radio bursts by Cassini/RPWS experiment
Boudjada, Mohammed Y.; Abou el-Fadl, Ahmed; Galopeau, Patrick H. M. +2 more
In this study, we report on the occurrence of solar Type III radio bursts recorded by radio and plasma wave experiment (RPWS) experiment onboard Cassini spacecraft. This instrument is designed to investigate the Saturn's plasma environment and sub-auroral radio missions. RPWS/Cassini experiment allows to measure electric field over a frequency ran…
Overtaking collisions of double layers and solitons: Tripolar structures and dynamical polarity switches
Olivier, C. P.; Verheest, F.
Overtaking collisions between double layers and solitons are investigated through the numerical simulation of the Gardner equation that governs small-amplitude double layers. The results show that the double layer emerges unaffected after the completion of the collision. However, the soliton that emerges from the collision has the opposite polarit…
Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems
Henry, Gregory W.; Kane, Stephen R.; Pepper, Joshua +15 more
The Transit Ephemeris Refinement and Monitoring Survey is a project that aims to detect transits of intermediate-long period planets by refining orbital parameters of the known radial velocity planets using additional data from ground-based telescopes, calculating a revised transit ephemeris for the planet, then monitoring the planet host star dur…
Re-reduction of CCD observations of Triton in 1996-2006 with Gaia DR2 and comparison with ephemerides
Cheng, X.; Yan, D.; Qiao, R. C. +1 more
The release of new high-precision and high-density catalogue Gaia DR2 brings new opportunities and challenges to high-precision astrometry. The early CCD images of planet satellites can be re-processed so as to give positions that are much more accurate than those initially obtained. Based on Gaia DR2 catalogue, the early CCD images of Triton take…
CCD UBV(RI)KC photometry of the open clusters Juchert 9 and Berkeley 97
Sung, Hwankyung; Oralhan, İnci Akkaya; Çakmak, Hikmet +3 more
The CCD UBV(RI)KC photometry of the poorly studied open clusters Juchert 9 (Juc 9) and Berkeley 97 (Be 97), which are observed with the 0.84 m telescope at the San Pedro Mártir National Observatory, México has been analyzed. For the likely cluster members, we determined the reddenings, E(B‑V) = 0.82 ± 0.04 (Juc 9) and E(B‑V) = 0.87 ± 0.05 (Be 97),…
Mixed-morphology supernova remnants: the case of SNR 0520-69.4 in the Large Magellanic Cloud
Rosado, M.; Reyes-Iturbide, J.; Ramírez-Ballinas, I. +2 more
We present observations in X-ray and optical emission of the supernova remnant (SNR) 0520-69.4 in the Large Magellanic Cloud. Using XMM-Newton observatory data, we produced images of the diffuse X-ray emission and spectra to obtain the X-ray parameters, such as luminosity and temperature, of hot plasma in the SNR. Diffuse X-ray emission with fille…
A GPU-based phase tracking method for planetary radio science applications
Yan, Jianguo; Barriot, Jean-Pierre; Wang, Guangli +3 more
This paper introduces a phase tracking method with a computational algorithm for planetary radio science implemented on NVIDIA GPUs. In contrast to the phase-locked loop phase counting method used in traditional Doppler data processing, this method fits the tracking data with optimal parameters into the shape expressed by Taylor expansion. The dif…
Astrometric observations of visual binaries using 26‑inch refractor at Pulkovo Observatory during 2014–2019
Izmailov, Igor; Rublevsky, Aleksey; Apetyan, Arina
We present 18,365 astrometric observations of 290 visual binaries obtained with the 26‑inch refractor of Pulkovo Observatory during 2014–2019. The separation between components is from 1″.3 to 37″ with a median value of 4″.8. For a single observation, the mean separation error is 0″.013, and the mean position angle error is 0∘.44/ρ, where ρ is an …
Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry
Straižys, V.; Raudeliūnas, S.; Maskoliūnas, M. +9 more
The open cluster IC 1369, located in Cygnus close to the galactic equator at the 89°6 longitude, and its vicinity are investigated by applying two-dimensional photometric classification of stars down to V = 19 mag measured in the Vilnius seven-color photometric system. Employing the Gaia DR2 coordinates, parallaxes, and proper motions, 143 cluster…
Characteristics of SEPs during solar cycles 21–24
Kumar, Raj; Pande, Bimal; Pande, Seema +1 more
The study of the solar energetic particle events (SEPs) and their association with solar flares and other activities are very crucial to understand the space weather. Keeping this in view, here we present the study of SEPs (intensity