標(biāo)題: Titlebook: Astrometric Techniques; Proceedings of the 1 Heinrich K. Eichhorn,Robert J. Leacock Conference proceedings 1986 International Astronomical [打印本頁] 作者: Forbidding 時(shí)間: 2025-3-21 19:24
書目名稱Astrometric Techniques影響因子(影響力)
作者: 羊欄 時(shí)間: 2025-3-21 20:55 作者: Boycott 時(shí)間: 2025-3-22 02:26
Thomas Hoffmeister,Henning Koch,Peter Trempthe solar neighborhood. Major obstacles to the full use of proper motions have long been posed by: (1) incompleteness of proper motion surveys, (2) proper motion bias in kinematic studies, and (3) the indirect approaches and kinematical assumptions needed in traditional luminosity studies.作者: Arctic 時(shí)間: 2025-3-22 05:49
Thomas Hoffmeister,Henning Koch,Peter Trempome consequences are indicated for the determination of cluster parallaxes, of secular parallaxes and of the galactic rotation. In general, we stress the necessity of always searching for . signal in the data — including those ones which are not understood and hence not ‘wanted’.作者: 才能 時(shí)間: 2025-3-22 10:32
Margrit E. Kaufmann,Henning Kochof the FK5 system which will be performed with the aid of new analytical methods developed at Heidelberg. The basic characteristics of these methods are described, and information on the most significant errors in the FK4 system is given.作者: 不規(guī)則的跳動(dòng) 時(shí)間: 2025-3-22 13:34 作者: sleep-spindles 時(shí)間: 2025-3-22 21:06
https://doi.org/10.1007/978-3-662-53308-6o on, relies upon the stellar system. Hence the stellar positions and proper motions, and the celestial reference coordinate system are essential to preserve the system of the Earth orientation parameters determined by the optical astrometry.作者: insolence 時(shí)間: 2025-3-22 22:55 作者: Brittle 時(shí)間: 2025-3-23 03:19 作者: PLE 時(shí)間: 2025-3-23 08:58
Thomas Hoffmeister,Henning Koch,Peter TrempThe importance of understanding the properties of a data sample which is to be used for calibrating luminosities can hardly be over-emphasized. In an earlier paper (Lutz 1983) I pointed out the methods for dealing with two well-defined cases. In this paper I will elaborate further on the same topic.作者: 去世 時(shí)間: 2025-3-23 10:07 作者: neutralize 時(shí)間: 2025-3-23 15:14
Statistical Problems Encountered in Using Trigonometric ParallaxesThe importance of understanding the properties of a data sample which is to be used for calibrating luminosities can hardly be over-emphasized. In an earlier paper (Lutz 1983) I pointed out the methods for dealing with two well-defined cases. In this paper I will elaborate further on the same topic.作者: follicle 時(shí)間: 2025-3-23 18:58
The Use of the Ratan-600 Radio Telescope in AstrometryThe RATAN-600 radio telescope (Kaidanovsky & al. 1972) was designed for solving various problems of astrophysics and radiophysics (Pariisky & al. 1972, Gelfreikh & al. 1972). Because of its high resolving power and large collecting area, this instrument can be used to measure accurate positions of radio sources.作者: 使腐爛 時(shí)間: 2025-3-24 02:15 作者: 攝取 時(shí)間: 2025-3-24 04:19
https://doi.org/10.1007/978-94-009-4676-7Astrometry; CCD; Hipparcos catalog; artificial satellite; astronomy; instruments; meridian circles作者: PRE 時(shí)間: 2025-3-24 10:24 作者: 脖子 時(shí)間: 2025-3-24 12:28
Jessica Cronshagen,Philip Hogh,Timm W?ltjentheir underlying principles (non-rotation of very distant objects, constancy of the frequencies associated to atomic transitions). The paper is an attempt to clarify the role of these natural references with respect to those which are implicitly defined by the dynamical theories..The example of time作者: ventilate 時(shí)間: 2025-3-24 17:10
Jessica Cronshagen,Philip Hogh,Timm W?ltjensome astronomical constants, and is therefore subject to revision in the future. 2) Since it is used for the FK5-based astronomical reference system, its eventual usefulness for space techniques is questioned. 3) Although the new and old UT1 merge continuously at a chosen epoch, they do not form a h作者: 膽大 時(shí)間: 2025-3-24 21:36 作者: dermatomyositis 時(shí)間: 2025-3-25 03:13 作者: dura-mater 時(shí)間: 2025-3-25 03:55 作者: APO 時(shí)間: 2025-3-25 09:41 作者: 逃避現(xiàn)實(shí) 時(shí)間: 2025-3-25 12:45 作者: 表臉 時(shí)間: 2025-3-25 16:49 作者: 切碎 時(shí)間: 2025-3-26 00:01 作者: overrule 時(shí)間: 2025-3-26 00:35 作者: 死亡 時(shí)間: 2025-3-26 06:55
Forschendes Lernen an Universit?ten of the observed diffraction pattern with a theoretical model. However, it is possible to use a deconvolution process based, for a single star, on the equation I′(x) = F′(x) ? O(x), involving both the derivative of the Fresnel diffraction function for a point-like source, and that of the observed in作者: NOVA 時(shí)間: 2025-3-26 10:28 作者: 預(yù)定 時(shí)間: 2025-3-26 14:54
https://doi.org/10.1007/978-3-662-53308-6o on, relies upon the stellar system. Hence the stellar positions and proper motions, and the celestial reference coordinate system are essential to preserve the system of the Earth orientation parameters determined by the optical astrometry.作者: insolence 時(shí)間: 2025-3-26 17:06 作者: 匍匐 時(shí)間: 2025-3-26 21:43
Lilian Streblow,André Brandhorstired between August 1979 and December 1982 have been analyzed to give positions for 82 radio sources. Standard J2000.0 astronomical models were applied. 90% of the formal errors for arc lengths between sources are less than 0..003. Arc lengths estimated from separate one-year data sets are consisten作者: Alopecia-Areata 時(shí)間: 2025-3-27 02:15 作者: 知道 時(shí)間: 2025-3-27 07:01 作者: acrimony 時(shí)間: 2025-3-27 11:01 作者: 輕信 時(shí)間: 2025-3-27 16:33
The Search for Unwanted Signals: Systematic Trends in Proper Motions of Fundamental Starsome consequences are indicated for the determination of cluster parallaxes, of secular parallaxes and of the galactic rotation. In general, we stress the necessity of always searching for . signal in the data — including those ones which are not understood and hence not ‘wanted’.作者: 勤勉 時(shí)間: 2025-3-27 18:00
A New Technique for the Analytical Determination of a Fundamental System of Positions and Proper Motof the FK5 system which will be performed with the aid of new analytical methods developed at Heidelberg. The basic characteristics of these methods are described, and information on the most significant errors in the FK4 system is given.作者: 叢林 時(shí)間: 2025-3-27 22:19
The Conversion from the B1950 FK4-Based Position to the J2000 Position of Celestial Objectsptical observations for Tokyo PZT. The method can be also applied to the conversion of radio sources where we have met a great difficulty in performing the conversion because of no citation of observation epochs in general. We discuss their necessity in order to establish a concrete compilation of the position of the radio sources.作者: aesthetician 時(shí)間: 2025-3-28 03:37 作者: Ballerina 時(shí)間: 2025-3-28 08:49 作者: 結(jié)束 時(shí)間: 2025-3-28 12:19 作者: LEERY 時(shí)間: 2025-3-28 16:34
https://doi.org/10.1007/978-3-658-11621-7lustration, the relativistic reduction of stellar parallaxes, Doppler satellite observations, navigation measurements with the aid of satellites and radiointerferometric measurements are presented in detail.作者: LUMEN 時(shí)間: 2025-3-28 20:39 作者: conifer 時(shí)間: 2025-3-28 22:55
Relativistic Reduction of Astrometric Observationslustration, the relativistic reduction of stellar parallaxes, Doppler satellite observations, navigation measurements with the aid of satellites and radiointerferometric measurements are presented in detail.作者: 埋伏 時(shí)間: 2025-3-29 03:51 作者: 莎草 時(shí)間: 2025-3-29 10:56 作者: 看法等 時(shí)間: 2025-3-29 13:18
Some Effects of Different Sources of Variation of Latitude Data on Meridian Circle Cataloguese of different determinations of the latitude variation significantly affects the individual observations and can introduce large zonal errors of the level of 0.05 seconds of arc into the catalogue’s declination system.作者: 表被動(dòng) 時(shí)間: 2025-3-29 16:48 作者: 盤旋 時(shí)間: 2025-3-29 22:42 作者: 含水層 時(shí)間: 2025-3-30 03:25 作者: AGATE 時(shí)間: 2025-3-30 07:44 作者: ornithology 時(shí)間: 2025-3-30 08:55
Discussion of Meaning and Definition of UTual definition of UT1 is suggested, in order to correct this situation and a formula to realize this conceptual definition is presented, which can be used unchanged for every technique and is easily understood by the nonspecialist community.作者: Gleason-score 時(shí)間: 2025-3-30 15:39
Global Reduction of Fundamental Astrometric Data for under the form of cubic spline functions. The results are equivalent to those of conventional procedures, provided due account is given to the fact that, in the global reduction, long period components of image motion are fully included in the standard error estimates.作者: Hot-Flash 時(shí)間: 2025-3-30 18:23
Jessica Cronshagen,Philip Hogh,Timm W?ltjen is discussed, since it already gave rise to serious difficulties, but similar problems may occur about the space references. Such complexities are suprising: one could have expected simplifications from the use of references which are not entangled with theory. Some suggestions are made for the use of these natural references.作者: Encumber 時(shí)間: 2025-3-30 22:11
Silvia Thünemann,Anna Schütz,Aysun Do?mu?K5. The Faint Fundamental Extension is currently being selected at the U. S. Naval Observatory. A proposed list of 1030 Faint Fundamental stars has been prepared for the Northern Hemisphere, and work has begun on the selection in the Southern Hemisphere.作者: 創(chuàng)新 時(shí)間: 2025-3-31 04:17
Brosche’s method for representing systematic differences in positions and proper motions of starsing procedure which seperates the systematic from the random parts. In the classiscal approach, the systematic differences are split into several components( for example Δ α .,Δ α. andΔ α. for right ascesion diffrences Δ α) each of whic, being dependent on one or two arguments, is tabulated at equid作者: thwart 時(shí)間: 2025-3-31 05:55 作者: Mortal 時(shí)間: 2025-3-31 09:38
The Extragalactic Optical/Radio Reference Frame A Progress Report, IAU Comm. 24 Working Groupress report which covers the group activities up to 1982 has been prepared recently (Argue and de Vegt, 1982)..Some of the present main activities of the working group are:.Future important fields are:作者: WAG 時(shí)間: 2025-3-31 13:48 作者: Gerontology 時(shí)間: 2025-3-31 19:37
Forschendes Lernen an Universit?tenrent values of ρ and △m. Noise has been added and we have studied the effect of the signal to noise ratio on determination of the parameters ρ and △m of the pair. A good accuracy for △m is obtained for ∣△m∣ ≦ 1 and noise ≦ 10%. The determination of ρ is well achieved for noise level reaching 15 %. T作者: 花束 時(shí)間: 2025-3-31 22:58 作者: Terminal 時(shí)間: 2025-4-1 05:40
Concepts of Reference Systemstheir underlying principles (non-rotation of very distant objects, constancy of the frequencies associated to atomic transitions). The paper is an attempt to clarify the role of these natural references with respect to those which are implicitly defined by the dynamical theories..The example of time作者: 可以任性 時(shí)間: 2025-4-1 07:52 作者: 發(fā)微光 時(shí)間: 2025-4-1 10:47
Relativistic Reduction of Astrometric Observationstronomical practice. One may offer three possible ways to overcome the related difficulties:.In this paper we prefer the second way. After formulating the heliocentric planetary and geocentric satellite equations of motion, the general technique for relativistic reduction in astrometry and geodynami作者: 五行打油詩 時(shí)間: 2025-4-1 16:20
Statistical Analysis of Proper Motion Surveysthe solar neighborhood. Major obstacles to the full use of proper motions have long been posed by: (1) incompleteness of proper motion surveys, (2) proper motion bias in kinematic studies, and (3) the indirect approaches and kinematical assumptions needed in traditional luminosity studies.作者: 下船 時(shí)間: 2025-4-1 18:48
The Search for Unwanted Signals: Systematic Trends in Proper Motions of Fundamental Starsome consequences are indicated for the determination of cluster parallaxes, of secular parallaxes and of the galactic rotation. In general, we stress the necessity of always searching for . signal in the data — including those ones which are not understood and hence not ‘wanted’.作者: colloquial 時(shí)間: 2025-4-1 22:53 作者: 嬉耍 時(shí)間: 2025-4-2 06:00 作者: negotiable 時(shí)間: 2025-4-2 07:31 作者: 因無茶而冷淡 時(shí)間: 2025-4-2 11:12 作者: extract 時(shí)間: 2025-4-2 17:12
