Publications of the Pulkovo Observatory最新文献

The results of the NEA astrometric observations with the Pulkovo 40-cm telescope at the Assy-Turgen observatory 利用阿西-图尔根天文台的普尔科沃 40 厘米望远镜进行的 NEA 天文观测结果

Publications of the Pulkovo Observatory Pub Date : 2023-12-01 DOI: 10.31725/0367-7966-2023-231-2

M. Khovrichev, S.I. Laznevoi, A.D. Lunchenko, A.A. Osetrovas

{"title":"The results of the NEA astrometric observations with the Pulkovo 40-cm telescope at the Assy-Turgen observatory","authors":"M. Khovrichev, S.I. Laznevoi, A.D. Lunchenko, A.A. Osetrovas","doi":"10.31725/0367-7966-2023-231-2","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-231-2","url":null,"abstract":"We present the results of astrometric observations of two near-Earth asteroids (2005 XY7 and 2007 UM12) performed in September-November 2023 with the 40-cm Pulkovo telescope in the Assy-Turgen observatory. Stellar and asteroid pixel coordinates were calculated by varying the photo center position, background, and flux values for the PSF (point spread function) based on the analysis of the stellar images. The stars within the 4-arcmin asteroid-centered ring were not involved in the astrometric calibration. These stars were used for the asteroid systematic correction calculation. As a result, the internal accuracy of asteroid positions was better than 0.1 arcsec. The estimation of the mean position and the apparent rate components were performed for each set of CCD frames. Finally, the typical accuracy of the coordinates reached values of 0.024 – 0.088 arcsec. In addition, the numerical integration of the asteroid motion was made by varying the components of the state vector and A2-parameter (Yarkovsky acceleration). The unexpected and statistically insignificant A2 value for the 2007 UM12 has been found. It can be explained by the low quality of the data related to the first approach of this asteroid to the Earth and/or the tidal effects that changed the rotational state of the asteroid. The value A2 = (8.1 ± 6.4) · 10−14 a.u. per day2 on the significance boundary has been calculated for 2005 XY7 asteroid. This value does not contradict well-known data for the same size asteroids.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"29 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138989117","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

About the Yarkovsky effect in the dynamics of asteroid (99942) Apophis 关于小行星 (99942) 阿波菲斯动力学中的雅尔科夫斯基效应

Publications of the Pulkovo Observatory Pub Date : 2023-12-01 DOI: 10.31725/0367-7966-2023-231-3

K.S. Lobanova, A. V. Melnikov

引用次数: 0

Can a neutron star undergo a direct transition between the states of ejector and accretor skipping the state of propeller? I. Approximation of non-magnetized accretion flow 中子星能否跳过推进器状态，在喷射器和吸积器状态之间直接转换？I. 非磁化吸积流的近似值

Publications of the Pulkovo Observatory Pub Date : 2023-12-01 DOI: 10.31725/0367-7966-2023-231-1

N. Ikhsanov, N. Beskrovnaya

引用次数: 0

Large Analysis of progress in improving the prediction accuracy of Earth's rotation parameters in Russian and international EOP services during last 16 years 过去 16 年俄罗斯和国际 EOP 服务在提高地球自转参数预测准确性方面的进展情况大分析

Publications of the Pulkovo Observatory Pub Date : 2023-12-01 DOI: 10.31725/0367-7966-2023-231-4

Z.M. Malkin

{"title":"Large Analysis of progress in improving the prediction accuracy of Earth's rotation parameters in Russian and international EOP services during last 16 years","authors":"Z.M. Malkin","doi":"10.31725/0367-7966-2023-231-4","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-231-4","url":null,"abstract":"The paper analyzes the real predictions of the Earth's rotation parameters (ERP) made in the Russian State Service of the Earth's Rotation (the Center for processing and analyzing data on the parameters of the Earth's rotation of the Main Metrological Center of the State Service of Time, Frequency and Determination of the Parameters of the Earth's Rotation, SSTF) and the International Earth Rotation and Reference Systems Service (IERS) in 2007--2023. Daily predictions of the Earth's Pole coordinates and Universal Time were considered. In total, 6021 SSTF predictions and 5684 IERS predictions were processed. The change in median and maximum errors over time for prediction lengths of 1, 3, 7, 15 and 30 days was studied. As a result, it turned out that over the past 16 years there has not been a general steady trend towards a decrease in the error of ERP predictions in both centers, although such a decrease is clearly noticeable for certain types and lengths of the prediction. Moreover, in some cases, there is a tendency to worsen the accuracy of the prediction, especially for the maximum error of short-term predictions of Universal Time.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"9 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138992662","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

Geodetic nutation of Jupiter and its Galilean moons 木星及其伽利略卫星的大地倾角

Publications of the Pulkovo Observatory Pub Date : 2023-12-01 DOI: 10.31725/0367-7966-2023-231-5

V. Pashkevich, A. N. Vershkov

{"title":"Geodetic nutation of Jupiter and its Galilean moons","authors":"V. Pashkevich, A. N. Vershkov","doi":"10.31725/0367-7966-2023-231-5","DOIUrl":"https://doi.org/10.31725/0367-7966-2023-231-5","url":null,"abstract":"In the article, the relativistic effect of geodetic nutation in the rotation of Jupiter and its Galilean moons (Io, Europa, Ganymede and Callisto) was investigated in two ways over an 800-year time interval. As a result, for the first time, the most significant periodic terms of the geodetic rotation of these celestial bodies relative to: a) the barycenter of the Solar system and the plane of the mean orbit of Jupiter of the epoch J2000.0 in the Euler angles, in the disturbing terms of the physical libration and in the absolute magnitude of the angular rotation vector of the geodetic rotation of the body under study; b) (with the exception of Jupiter) the barycenter of the Jupiter satellite system and the mean orbit of the studied satellite of the epoch J2000.0 in the disturbing terms of the physical libration and in the absolute magnitude of the angular rotation vector of the geodetic rotation of the body under study. It is shown that the use of Way II in this study, which uses the numerical integration procedure, is more preferable, and the values of the geodetic nutation terms obtained by this way are more accurate. The accuracy level of calculating the parameters (obtained by Way II) for the geodetic nutation values of the studied celestial bodies was 0.1 microarcseconds. The obtained analytical values of geodetic nutation of the studied celestial bodies can be used for numerical investigation of the rotation of these bodies in the relativistic approximation.","PeriodicalId":171274,"journal":{"name":"Publications of the Pulkovo Observatory","volume":"125 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139016556","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

Clarifying the nature of the spiral structure in galaxies: such different cases of NGC 3686 and M 100 阐明星系中螺旋结构的本质:ngc3686和m100的不同情况

Publications of the Pulkovo Observatory Pub Date : 2023-08-01 DOI: 10.31725/0367-7966-2023-229-7

A. Marchuk, V. Kostiuk

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On perturbations in the rotational motion of an asteroid during its close approach to the Earth 关于小行星在接近地球时旋转运动的扰动

Publications of the Pulkovo Observatory Pub Date : 2023-08-01 DOI: 10.31725/0367-7966-2023-229-5

K.S. Lobanova, A. Melnikov

引用次数: 0

Results of baseline observations of asteroid 87 Sylvia on October 29, 2019 2019年10月29日对小行星87西尔维亚的基线观测结果

Publications of the Pulkovo Observatory Pub Date : 2023-08-01 DOI: 10.31725/0367-7966-2023-229-2

D. Bikulova, A. H. Aliev

引用次数: 0

Globular clusters in the central region of the Milky Way galaxy. II. Frequency analysis of orbits built from Gaia ED3 data 银河系中心区域的球状星团。2根据盖亚ED3数据建立的轨道频率分析

Publications of the Pulkovo Observatory Pub Date : 2023-08-01 DOI: 10.31725/0367-7966-2023-229-1

A. Bajkova, A. Smirnov, V. Bobylev

引用次数: 0

Comparison of optical magnitudes of astrometric radio sources obtained from Gaia and ground based observations 从盖亚和地面观测获得的天体测量射电源的光学星等比较

Publications of the Pulkovo Observatory Pub Date : 2023-08-01 DOI: 10.31725/0367-7966-2023-229-6

Z. Malkin

引用次数: 0