Nick Sioulas
A5055394080- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Market Dynamics and Volatility
- Space Exploration and Technology
- Solar Radiation and Photovoltaics
- Geological and Geochemical Analysis
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Molecular Spectroscopy and Structure
National Observatory of Athens
2021
Abstract The ExoClock project is an inclusive, integrated, and interactive platform that was developed to monitor the ephemerides of Ariel targets increase mission efficiency. makes best use all available resources, i.e., observations from ground telescopes, midtime values literature, finally, space instruments. Currently, network includes 280 participants with telescopes capable observing 85% currently known candidate targets. This work results ∼1600 obtained up 2020 December 31 network....
The Ariel mission will observe spectroscopically around 1000 exoplanets to further characterise their atmospheres. For the be as efficient possible, a good knowledge of planets' ephemerides is needed before its launch in 2028. While for some planets are being refined on per-case basis, an organised effort collectively verify or update them when necessary does not exist. In this study, we introduce ExoClock project, open, integrated and interactive platform with purpose producing confirmed...
Abstract We present the results of a fourth planetary defense exercise, focused this time on small near-Earth asteroid (NEA) 2023 DZ2 and conducted during its close approach to Earth in March. The International Asteroid Warning Network (IAWN), with support from NASA's Planetary Defense Coordination Office (PDCO), has been coordinating observational campaigns since 2017 test operational readiness global capabilities. last campaign NEA Apophis, an outcome that exercise was need for short burst...
Abstract As part of the International Asteroid Warning Network's observational exercises, we conducted a campaign to observe near-Earth asteroid 2019 XS around its close approach Earth on 2021 November 9. The goal was characterize errors in observation times reported Minor Planet Center, which become an increasingly important consideration as astrometric accuracy improves and more fast-moving asteroids are observed. exercise, total 957 observations during encounter were subsequently analyzed...
Families of asteroids generated by the collisional fragmentation a common parent body have been identified using clustering methods in their proper orbital element space. An alternative method has developed order to identify families from correlation between asteroid fragment sizes and semi-major axis distance family centre (V-shape). This shown be effective cases very diffuse that formed billions years ago. We obtained photometric observations construct rotational light curves; we combine...
Abstract The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for second observing campaign to test the timing accuracy astrometric observation. With 82 participating stations, International Asteroid Warning Network collected 1046 observations around time approach. Compared previous targeting 2019 XS, some individual observers were able significantly improve their reported observation times. In particular, U.S. surveys achieved...
It has been recently accepted that the standard classification of solar wind solely according to flow speed is outdated, and particular interest devoted study origin evolution so-called Alfvénic slow streams what extent such resemble or differ from fast wind. In March 2022, Solar Orbiter completed its first nominal phase perihelion passage. During this interval, it observed several Alfv\'enic streams, allowing for characterization fluctuations in three intervals (AS1-AS3) comparison with a...
NOAK Observatory, Stavraki (IAU code L02) Ioannina, Greece (nsioulas@hotmail.com)IntroductionIn this work, the astrometric observations of four asteroids will be presented which took place on 2019 from observatory located at in Greece. The results and procedure submitting measurements to MinorPlanetCenter discussed.AbstractAstrometry is measurement positions, parallaxes proper motion an astronomical body. Especially astrometry Near Earth Objects (NEO) demands great accuracy cooperation...
<p><strong>Introduction</strong></p> <p>Asteroid families generated by the collisional fragmentation of a common parent body have been identified using clustering methods asteroids in their proper orbital element space (Broz & Morbidelli 2013; Tsirvoulis et al. 2018; Dermott 2021). However, there is growing evidence that some real are larger than corresponding cluster objects elements, as well escaped...
Photometric observations of the main-belt asteroid 665 Sabine and Minor Planet Bulletin Nick SioulasNOAK Observatory, Stavraki (IAU code L02) Ioannina, Greece (nsioulas@hotmail.com)IntroductionIn this work, photometric were conducted from NOAK in order to determine its synodic rotation period. The results submitted Asteroid Lightcurve Photometry Database (ALCDEF) Bulletin.AbstractThe Minor Bulletin is the official publication Planets Section...