{"title":"“Magnetospheric gate” effect in polars","authors":"N. Ikhsanov, V.V. Kim, O. A. Korol’kova","doi":"10.31725/0367-7966-2023-228-7","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-7","url":null,"abstract":"The mass-exchange process in close binary systems which appear as polars is discussed. We point out that the strong magnetic field of the white dwarf in these systems can under certain conditions prevent material from flowing through the L1 point operating as a “magnetospheric gate”. Using some best studied polars as an example we show that the conditions in which the flow through the L1 point is suppressed can be satisfied. A discussion on an alternative mass-exchange mechanism in this situation appears to be quite reasonable.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115238248","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}
{"title":"On the magnitude of the Yarkovsky effect in the dynamics of potentially hazardous asteroids","authors":"A. Martyusheva, A. Melnikov","doi":"10.31725/0367-7966-2023-228-11","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-11","url":null,"abstract":"Estimates of the influence of the solar radiation pressure and the Yarkovsky effect on the long-term orbital dynamics are obtained for a number of asteroids experiencing successive approaches to planets. Based on the estimates of the change in the value of the asteroid’s proper rotation period obtained in (Melnikov, 2022) due to its approaches to the planets, the influence of such events on the further orbital dynamics of an asteroid through the Yarkovsky effect is considered. It is shown that close encounters with the planets of small asteroids (tens of meters in diameter) with fast rotation (proper rotation period less than 10 h), leading to a change in the asteroid rotation period by several hours, can change the magnitude of the Yarkovsky effect by 30–50%.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128015762","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}
{"title":"Progress of the OCARS catalog in 2018–2022","authors":"Z. Malkin","doi":"10.31725/0367-7966-2023-228-9","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-228-9","url":null,"abstract":"The OCARS catalog (Optical Characteristics of Astrometric Radio Sources) is a compiled catalog of various additional data related to astrometric radio sources, that is, objects whose coordinates are determined from VLBI observations. It contains the source coordinates in the radio and optical bands, object type, redshift, photometric data in the optical and near infrared bands, as well as a cross-reference table of the source names in various commonly used catalogs. The last detailed description of the OCARS catalog was published in 2018. This paper describes the changes in the catalog that have occurred over the past five years and its current state.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127323516","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}
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