Improvement of accurancy of proper motions of Hipparcos catalogue stars using optical latitude observations

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Improvement of accurancy of proper motions of Hipparcos catalogue stars using optical latitude observations

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dc.contributor.author Damljanović, Goran
dc.date.accessioned 2010-03-24T14:31:20Z
dc.date.available 2010-03-24T14:31:20Z
dc.date.issued 2007
dc.identifier.uri http://hdl.handle.net/123456789/601
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dc.format.extent 300 en_US
dc.format.mimetype pdf en_US
dc.language.iso sr en_US
dc.publisher Faculty of Mathematics, University of Belgrade en_US
dc.title Improvement of accurancy of proper motions of Hipparcos catalogue stars using optical latitude observations en_US
mf.title.original Povećanje tačnosti sopstvenihi kretanja zvezda Hiparkos kataloga na osnovu optičkih širinskih posmatranja en_US
mf.subject.area Astronomy en_US
mf.university.en University of Belgrade en_US
mf.university.faculty Faculty of Mathematics en_US
mf.document.pages 153 en_US
mf.description.abstract-ext The Commission 19 (Earth Rotation) of the International Astronomical Union (IAU) established the Working Group on Earth Rotation in the Hipparcos Reference Frame (WG ERHRF) at 1995 to collect the optical observations of latitude and universal time variations, made during 1899.7 – 1992.0 in line with Earth orientation programmes (to derive Earth Orientation Parameters – EOP), with Dr. Jan Vondr´ak (Astronomical Institute of Academy of Sciences of the Czech Republic, Prague) as a head of WG ERHRF. We participated in this international project with the Belgrade visual zenith – telescope (BLZ) latitude data of the period 1949.0 – 1986.0, after new reduction of BLZ data made during my MSc thesis finished 1997 at Natural – Mathematical Faculty of Belgrade University. Dr. Vond´ark collected 4.4 million optical observations of latitude/universal time variations made at 33 observatories. The data were used for EOP investigations, Hipparcos satellite Catalogue – radio sources connection, etc. Nowadays, it is actual to correct the positions and proper motions of stars of Hipparcos Catalogue (as an optical reference frame) using ground – based observations of some Hipparcos stars. In this PhD thesis we use the latitude observations made by several types of classical astrometric instruments: visual (ZT) and floating zenith – telescope (FZT), visual zenith tube (VZT) and photographic zenith tube (PZT); 26 different instruments located at many observatories all over the world (used in the programmes of monitoring the Earth orientation during the 20th century). We received the data from Dr. Vondr´ak via private communication. The observatories and instruments are: International Latitude Service – ILS (Carloforte – CA ZT, Cincinnati – CI ZT, Gaithersburg – GT ZT, Kitab – KZ ZT, Mizusawa – MZZ ZT, Tschardjui – TS ZT and Ukiah – UK ZT), Belgrade (BLZ ZT), Blagoveschtschensk (BK ZT), Irkutsk (IRZ ZT), Poltava (POL ZT), Pulkovo (PU and PUZ ZT), Varsovie (VJZ ZT), Mizusawa (MZL FZT), Tuorla – Turku (TT VZT), Mizusawa (MZP and MZQ PZT), Mount Stromlo (MS PZT), Ondˇrejov (OJP PZT), Punta Indio (PIP PZT), Richmond (RCP and RCQ PZT) and Washington (WA, W and WGQ PZT). The task is to improve proper motions in declination of the observed Hipparcos stars. The original method was developed, and it consists in removing from the instantaneous observed latitudes all known effects (polar motion and some local instrumental errors). The corrected latitudes are then used to calculate the corrections of Hipparcos proper motions in declination (Damljanovi´c, Serb. Astron. J. 170, 2005). The Least Squares Method (LSM) is used with the linear model. We compared calculated results with ARIHIP and EOC-2 data, and the consistency were good. The newly obtained values of proper motions in declination are substantially more precise than those of the Hipparcos Catalogue. It is because the time interval covered by latitude observations (tens of years) is much longer than the Hipparcos one (less than four years), and because of great number of observations made during this interval (Damljanovi´c et al., Serb. Astron. J. 172, 2006). Our method is completely different from the one used to determine the catalogue EOC-2 (Vondr´ak, Serb. Astron. J. 168, 2004). It was an almost independent check of the proper motions of EOC-2, also. The catalogue EOC-2 is used in this thesis to distinguish the corrections of the two stars of a pair observed by Horrebow – Talcott method. The difference between the two proper motions is constrained to the difference in the EOC-2 and Hipparcos catalogues (Damljanovi´c and Pejovi´c, Serb. Astron. J. 173, 2006). The main result of the thesis is the catalogue of proper motions in declination of 2347 Hipparcos stars. It is presented in Table 27. en_US

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