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Astrometry and photometry of asteroids from the UkrVO database of astroplates 来自UkrVO星盘数据库的小行星天体测量和光度测定
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921322000047
I. Vavilova, S. Shatokhina, L. Pakuliak, O. Yizhakevych, I. Eglitis, V. Andruk, Y. Protsyuk
{"title":"Astrometry and photometry of asteroids from the UkrVO database of astroplates","authors":"I. Vavilova, S. Shatokhina, L. Pakuliak, O. Yizhakevych, I. Eglitis, V. Andruk, Y. Protsyuk","doi":"10.1017/S1743921322000047","DOIUrl":"https://doi.org/10.1017/S1743921322000047","url":null,"abstract":"Abstract We present the developed methods of digitization, image processing, reduction, and scientific data mining with the latest reference catalogs, which allowed us to obtain a good positional and photometric accuracy in B-band of 6,500 asteroids down to 17.5 m from the Ukrainian Virtual Observatory database of astroplates. The archive includes FON-Kyiv, FON-Kitab, FON-Dushanbe sky surveys (1981–1996) and astroplates of the Baldone and Tautenburg observatories. For some of asteroids, observations are either completely absent or not enough over the certain time interval to the moments of their official discoveries (about 300 such objects were found). Positional observations during these time scales are highly useful for a more detailed study of the dynamics and orbital parameters of asteroids as well as the obtained photometric parameters are very complementary with present-day data for studying changes in brightness and light curves.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"101 1","pages":"239 - 245"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85880643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
IAU volume 15 issue 364 Cover and Front matter 国际天文学联合会第15卷第364期封面和封面问题
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S174392132200179X
Alessandra Celletti, C. Galeş, Cristian Beaugé, Anne Lemaître
{"title":"IAU volume 15 issue 364 Cover and Front matter","authors":"Alessandra Celletti, C. Galeş, Cristian Beaugé, Anne Lemaître","doi":"10.1017/S174392132200179X","DOIUrl":"https://doi.org/10.1017/S174392132200179X","url":null,"abstract":"","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"1 1","pages":"f1 - f16"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77085333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Back-tracing space debris using proper elements 使用适当的元素对空间碎片进行反向追踪
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921322000588
A. Celletti, G. Pucacco, T. Vartolomei
{"title":"Back-tracing space debris using proper elements","authors":"A. Celletti, G. Pucacco, T. Vartolomei","doi":"10.1017/S1743921322000588","DOIUrl":"https://doi.org/10.1017/S1743921322000588","url":null,"abstract":"Abstract Normal form methods allow one to compute quasi-invariants of a Hamiltonian system, which are referred to as proper elements. The computation of the proper elements turns out to be useful to associate dynamical properties that lead to identify families of space debris, as it was done in the past for families of asteroids. In particular, through proper elements we are able to group fragments generated by the same break-up event and we possibly associate them to a parent body. A qualitative analysis of the results is given by the computation of the Pearson correlation coefficient and the probability of the Kolmogorov-Smirnov statistical test.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"22 1","pages":"134 - 139"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80938590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chaos identification through the auto-correlation function indicator (ACFI) 基于自相关函数指示器的混沌识别
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001307
V. Carruba, S. Aljbaae, R. C. Domingos, M. Huaman, W. Barletta
{"title":"Chaos identification through the auto-correlation function indicator (ACFI)","authors":"V. Carruba, S. Aljbaae, R. C. Domingos, M. Huaman, W. Barletta","doi":"10.1017/S1743921321001307","DOIUrl":"https://doi.org/10.1017/S1743921321001307","url":null,"abstract":"Abstract Close encounters or resonances overlaps can create chaotic motion in small bodies in the Solar System. Approaches that measure the separation rate of trajectories that start infinitesimally near, or changes in the frequency power spectrum of time series, among others, can discover chaotic motion. In this paper, we introduce the ACF index (ACFI), which is based on the auto-correlation function of time series. Auto-correlation coefficients measure the correlation of a time-series with a lagged duplicate of itself. By counting the number of auto-correlation coefficients that are larger than 5% after a certain amount of time has passed, we can assess how the time series auto-correlates with each other. This allows for the detection of chaotic time-series characterized by low ACFI values.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"66 1","pages":"108 - 112"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76310937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Some of the most interesting cases of close asteroid pairs perturbed by resonance 一些最有趣的近距离小行星对被共振扰动的例子
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001320
A. Rosaev, E. Plávalová
{"title":"Some of the most interesting cases of close asteroid pairs perturbed by resonance","authors":"A. Rosaev, E. Plávalová","doi":"10.1017/S1743921321001320","DOIUrl":"https://doi.org/10.1017/S1743921321001320","url":null,"abstract":"Abstract We have randomly selected 20 close asteroid pairs (younger than 800 kyr) from known pairs, and by the application of backward numerical integration we have calculated their orbits. For the reason of speeding up the process of making the resonances visible, we have used a high value of Yarkowsky drift. The results of the calculation show that only two pairs appear to have a simple resonance with Earth and Jupiter while half of the tested pairs are visibly in the vicinity of three-body resonances. We have found a 2-1J-1M resonance for the pair (56232) 1999 JM31 and (115978) 2003 WQ56. Following our study of the pair (10123) Fideoja and (117306) 2004 VF21, we discovered a different resonance than the 7-2J mean motion resonance previously published: we have proved that this pair is perturbed by 9-6J-4M three body resonance.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"542 1","pages":"226 - 231"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76709150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Latitudinal variations of charged dust in co-orbital resonance with Jupiter 带电尘埃在木星共轨道共振中的纬度变化
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921322000758
Stefanie Reiter, C. Lhotka
{"title":"Latitudinal variations of charged dust in co-orbital resonance with Jupiter","authors":"Stefanie Reiter, C. Lhotka","doi":"10.1017/S1743921322000758","DOIUrl":"https://doi.org/10.1017/S1743921322000758","url":null,"abstract":"Abstract The interplanetary magnetic field may cause large amplitude changes in the orbital inclinations of charged dust particles. In order to study this effect in the case of dust grains moving in 1:1 mean motion resonance with planet Jupiter, a simplified semi-analytical model is developed to reduce the full dynamics of the system to the terms containing the information of the secular evolution dominated by the Lorentz force. It was found that while the planet causes variations in all orbital elements, the influence of the magnetic field most heavily impacts the long-term evolution of the inclination and the longitude of the ascending node. The simplified secular-resonant model recreates the oscillations in these parameters very well in comparison to the full solution, despite neglecting the influence of the magnetic field on the other orbital parameters.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"29 1","pages":"102 - 107"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73685129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Tides and Exoplanets 关于潮汐和系外行星
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921322000059
S. Ferraz-Mello
{"title":"On Tides and Exoplanets","authors":"S. Ferraz-Mello","doi":"10.1017/S1743921322000059","DOIUrl":"https://doi.org/10.1017/S1743921322000059","url":null,"abstract":"Abstract This paper reviews the basic equations used in the study of the tidal variations of the rotational and orbital elements of a system formed by one star and one close-in planet as given by the creep tide theory and Darwin’s constant time lag (CTL) theory. At the end, it reviews and discusses the determinations of the relaxation factors (and time lags) in the case of host stars and hot Jupiters based on actual observations of orbital decay, stellar rotation and age, etc. It also includes a recollection of the basic facts concerning the variations of the rotation of host stars due to the leakage of angular momentum associated with stellar winds.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"25 1","pages":"20 - 30"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81044936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An algorithm for automatic identification of asymmetric transits in the TESS database 一种TESS数据库非对称凌日自动识别算法
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921322000023
M. Vasylenko, Y. Pavlenko, D. Dobrycheva, I. Kulyk, O. Shubina, P. Korsun
{"title":"An algorithm for automatic identification of asymmetric transits in the TESS database","authors":"M. Vasylenko, Y. Pavlenko, D. Dobrycheva, I. Kulyk, O. Shubina, P. Korsun","doi":"10.1017/S1743921322000023","DOIUrl":"https://doi.org/10.1017/S1743921322000023","url":null,"abstract":"Abstract Currently, the Transiting Exoplanet Survey Satellite (TESS) searches for Earth-size planets around nearby dwarf stars. To identify specific weak variations in the light curves of stars, sophisticated data processing methods and analysis of the light curve shapes should be developed and applied. We report some preliminary results of our project to find and identify minima in the light curves of stars collected by TESS and stored in the MAST (Mikulski Archive for Space Telescopes) database. We developed Python code to process the short-cadence (2-min) TESS PDCSAP (Pre-search Data Conditioning Simple Aperture Photometry) light curves. Our code allows us to create test samples to apply machine learning methods to classify minima in the light curves taking into account their morphological signatures. Our approach will be used to find and analyze some sporadic events in the observed light curves originating from transits of comet-like bodies.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"21 1","pages":"264 - 266"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86512655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New results on orbital resonances. 轨道共振的新结果。
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 Epub Date: 2022-05-30 DOI: 10.1017/s1743921321001411
Renu Malhotra
{"title":"New results on orbital resonances.","authors":"Renu Malhotra","doi":"10.1017/s1743921321001411","DOIUrl":"10.1017/s1743921321001411","url":null,"abstract":"<p><p>Perturbative analyses of planetary resonances commonly predict singularities and/or divergences of resonance widths at very low and very high eccentricities. We have recently reexamined the nature of these divergences using non-perturbative numerical analyses, making use of Poincaré sections but from a different perspective relative to previous implementations of this method. This perspective reveals fine structure of resonances which otherwise remains hidden in conventional approaches, including analytical, semi-analytical and numerical-averaging approaches based on the critical resonant angle. At low eccentricity, first order resonances do not have diverging widths but have two asymmetric branches leading away from the nominal resonance location. A sequence of structures called \"low-eccentricity resonant bridges\" connecting neighboring resonances is revealed. At planet-grazing eccentricity, the true resonance width is non-divergent. At higher eccentricities, the new results reveal hitherto unknown resonant structures and show that these parameter regions have a loss of some - though not necessarily entire - resonance libration zones to chaos. The chaos at high eccentricities was previously attributed to the overlap of neighboring resonances. The new results reveal the additional role of bifurcations and co-existence of phase-shifted resonance zones at higher eccentricities. By employing a geometric point of view, we relate the high eccentricity phase space structures and their transitions to the shapes of resonant orbits in the rotating frame. We outline some directions for future research to advance understanding of the dynamics of mean motion resonances.</p>","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"14 1","pages":"85-101"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9153285/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74993928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Noise, friction and the radial-orbit instability in anisotropic stellar systems: stochastic N–body simulations 各向异性恒星系统中的噪声、摩擦和径向轨道不稳定性:随机n体模拟
Proceedings of the International Astronomical Union Pub Date : 2021-10-01 DOI: 10.1017/S1743921321001484
P. Di Cintio, L. Casetti
{"title":"Noise, friction and the radial-orbit instability in anisotropic stellar systems: stochastic N–body simulations","authors":"P. Di Cintio, L. Casetti","doi":"10.1017/S1743921321001484","DOIUrl":"https://doi.org/10.1017/S1743921321001484","url":null,"abstract":"Abstract By means of numerical simulations we study the radial-orbit instability in anisotropic self-gravitating N–body systems under the effect of noise. We find that the presence of additive or multiplicative noise has a different effect on the onset of the instability, depending on the initial value of the orbital anisotropy.","PeriodicalId":20590,"journal":{"name":"Proceedings of the International Astronomical Union","volume":"27 1","pages":"152 - 157"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75738618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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