Highlights of Astronomy最新文献_第9页

Oxygen in Unevolved Starss 未进化恒星中的氧

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600013952

A. Boesgaard

引用次数: 0

Observations of Gas-Phase Atoms and Molecules 气相原子和分子的观察

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600012806

J. Lacy

引用次数: 0

Helicity pattern of CME source active regions 日冕物质抛射源活动区的螺旋型

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600015288

Jingxiu Wang, Guiping Zhou, Jun Zhang

引用次数: 0

An a priori model for the reduction of nutation observations: KSV(1994.3) nutation series 章动观测值减少的一个先验模型:KSV(1994.3)章动序列

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600011060

T. Herring

{"title":"An a priori model for the reduction of nutation observations: KSV(1994.3) nutation series","authors":"T. Herring","doi":"10.1017/S1539299600011060","DOIUrl":"https://doi.org/10.1017/S1539299600011060","url":null,"abstract":"Abst.ra.ct! We discuss the formulation of a new nutation series to be used 'in the reduction of modern space geodetic data. The motivation for devel: oping such a series is to develop a nutation series that has smaller short . period errors than the IAU 1980 nutation series and to provide a series that can be used with techniques such as the Global Positioning System (GPS) eo • that have sensitivity to nutations but can directly separate the effects of o M ' nutations from errors in the dynamical force models that effect the satellite ^ to ,$• orbits. A modern nutation series should allow the errors in the force models ^ *o <? .for GPS to be better understood. The series is constructed by convolving 2 £ § the Kinoshita and Souchay rigid Earth nutation series with an Earth response function whose parameters are partly based on geophysical models ^ 't of the Earth and partly estimated from a long series (1979-1993) of very x. long baseline interferometry (VLBI) estimates of nutation angles. Secular 2 rates of change of the nutation angles to represent corrections to the precession constant and a secular change of the obliquity of the ecliptic are included in the theory. Time dependent amplitudes of the Free Core Nutation (FCN) that is most likely excited by variations in atmospheric pressure are included when the geophysical parameters are estimated. The complex components of the prograde annual nutation are estimated simultaneously with the geophysical parameters because of the large contribution to the nutation from the 5i atmospheric tide. The weighted root mean square (WRMS) scatter of the nutation angle estimates about this new model are 0.32 mas and the largest correction to the series when the amplitudes of the ten largest nutations are estimated is 0.17 ± 0.03 mas for the in phase component of the prograde 18.6 year nutation.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120946023","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: 10

Hipparcos and Primary Distance Scale Indicators Hipparcos和主要距离标度指标

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600022358

C. Turon

引用次数: 0

The Role of the Central (Pulkovo) Observatory in Southern Hemisphere Star Observations 中央(普尔科沃)天文台在南半球恒星观测中的作用

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600013733

V. Abalakin, A. Arkharov, Y. Gnedin, I. I. Kanayev, D. Polojentsev, H. Potter

引用次数: 0

Diffusion, Winds and X-Rays from Magnetic Stars 磁星的扩散、风和x射线

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1007/978-94-011-4778-1_20

J. Babel

引用次数: 1

An international research station in Antarctica 南极洲的一个国际研究站

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600022693

J. T. Lynch

引用次数: 0

Infrared spectroscopy of the Centaur Asbolus with the ESO-Very Large Telescope 半人马座Asbolus的红外光谱与eso -甚大望远镜

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600013356

C. Bergh, M. Barucci, A. L. Bras, J. Romón, B. Schmitt, J. Cuby

引用次数: 0

Observations of Luni-solar precession 月-日岁差观测

Highlights of Astronomy Pub Date : 1900-01-01 DOI: 10.1017/S1539299600010947

D. Mccarthy, B. Luzum

{"title":"Observations of Luni-solar precession","authors":"D. Mccarthy, B. Luzum","doi":"10.1017/S1539299600010947","DOIUrl":"https://doi.org/10.1017/S1539299600010947","url":null,"abstract":"The observations of dip and de used in this analysis were taken from the combination solution of the IERS Sub-Bureau for Rapid Service and Precition (McCarthy and Luzum 1991a). Besides correc tions to the coefficients determined from VLBI, additional estimates can be derived from lunar laser ranging (LLR) observations (Williams et al. 1991; Whipple 1993). Table ?? shows a comparison of the estimates of the change in longitude and obliquity derived in this analysis with corresponding terms from analyses by other authors using different observations. The theoretical value of obliquity by Williams (1994) is also included for comparison. There are significant unexplained discrepancies among the rate estimates. Difference in the methods of the analyses such as the procesure for the estimation of the nutation coefficients and correlations within the solutions probably account for the greater part of these discrepancies. In considering the adoption of changes in the IAU model for nuta tion, it is important to recall that changes must also be made in the precession constant. Introduction of changes in nutation without corresponding changes in precession will not improve the agreement between observations and theory.","PeriodicalId":422890,"journal":{"name":"Highlights of Astronomy","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127297429","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