Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades
During the last century, there were many so-called independent latitude (IL) stations with the observations which were included into data of a few international organizations (like Bureau International de l'Heure - BIH, International Polar Motion Service - IPMS) and the Earth rotation...
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| Format: | Article |
| Language: | English |
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Astronomical Observatory, Department of Astronomy, Belgrade
2011-01-01
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| Series: | Serbian Astronomical Journal |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2011/1450-698X1182035D.pdf |
| _version_ | 1811324099182460928 |
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| author | Damljanović G. Milić I.S. |
| author_facet | Damljanović G. Milić I.S. |
| author_sort | Damljanović G. |
| collection | DOAJ |
| description | During the last century, there were many so-called independent latitude (IL)
stations with the observations which were included into data of a few
international organizations (like Bureau International de l'Heure - BIH,
International Polar Motion Service - IPMS) and the Earth rotation programmes
for determining the Earth Orientation Parameters - EOP. Because of this,
nowadays, there are numerous astrometric ground-based observations (made over
many decades) of some stars included in the Hipparcos Catalogue (ESA 1997).
We used these latitude data for the inverse investigations - to improve the
proper motions in declination μβ of the mentioned Hipparcos stars. We
determined the corrections Δμβ and investigated agreement of our μβ and those
from the catalogues Hipparcos and new Hipparcos (van Leeuwen 2007). To do
this we used the latitude variations of 7 stations (Belgrade,
Blagoveschtschensk, Irkutsk, Poltava, Pulkovo, Warsaw and Mizusawa), covering
different intervals in the period 1904.7 - 1992.0, obtained with 6 visual and
1 floating zenith telescopes (Mizusawa). On the other hand, with regard that
about two decades have elapsed since the Hipparcos ESA mission observations
(the epoch of Hipparcos catalogue is 1991.25), the error of apparent places
of Hipparcos stars has increased by nearly 20 mas because of proper motion
errors. Also, the mission lasted less than four years which was not enough
for a sufficient accuracy of proper motions of some stars (such as double or
multiple ones). Our method of calculation, and the calculated μβ for the
common IL/Hipparcos stars are presented here. We constructed an IL catalogue
of 1200 stars: there are 707 stars in the first part (with at least 20 years
of IL observations) and 493 stars in the second one (less than 20 years). In
the case of μβ of IL stars observed at some stations (Blagoveschtschensk,
Irkutsk, Mizusawa, Poltava and Pulkovo) we find the formal errors less than
the corresponding Hipparcos ones and for some of them (stations
Blagoveschtschensk and Irkutsk) even less than the new Hipparcos ones. |
| first_indexed | 2024-04-13T14:08:14Z |
| format | Article |
| id | doaj.art-ec94b1914c2b441a839b8d36b335d34c |
| institution | Directory Open Access Journal |
| issn | 1450-698X 1820-9289 |
| language | English |
| last_indexed | 2024-04-13T14:08:14Z |
| publishDate | 2011-01-01 |
| publisher | Astronomical Observatory, Department of Astronomy, Belgrade |
| record_format | Article |
| series | Serbian Astronomical Journal |
| spelling | doaj.art-ec94b1914c2b441a839b8d36b335d34c2022-12-22T02:43:52ZengAstronomical Observatory, Department of Astronomy, BelgradeSerbian Astronomical Journal1450-698X1820-92892011-01-012011182354110.2298/SAJ1182035D1450-698X1182035DCorrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decadesDamljanović G.0Milić I.S.1Astronomical Observatory, BelgradeAstronomical Observatory, BelgradeDuring the last century, there were many so-called independent latitude (IL) stations with the observations which were included into data of a few international organizations (like Bureau International de l'Heure - BIH, International Polar Motion Service - IPMS) and the Earth rotation programmes for determining the Earth Orientation Parameters - EOP. Because of this, nowadays, there are numerous astrometric ground-based observations (made over many decades) of some stars included in the Hipparcos Catalogue (ESA 1997). We used these latitude data for the inverse investigations - to improve the proper motions in declination μβ of the mentioned Hipparcos stars. We determined the corrections Δμβ and investigated agreement of our μβ and those from the catalogues Hipparcos and new Hipparcos (van Leeuwen 2007). To do this we used the latitude variations of 7 stations (Belgrade, Blagoveschtschensk, Irkutsk, Poltava, Pulkovo, Warsaw and Mizusawa), covering different intervals in the period 1904.7 - 1992.0, obtained with 6 visual and 1 floating zenith telescopes (Mizusawa). On the other hand, with regard that about two decades have elapsed since the Hipparcos ESA mission observations (the epoch of Hipparcos catalogue is 1991.25), the error of apparent places of Hipparcos stars has increased by nearly 20 mas because of proper motion errors. Also, the mission lasted less than four years which was not enough for a sufficient accuracy of proper motions of some stars (such as double or multiple ones). Our method of calculation, and the calculated μβ for the common IL/Hipparcos stars are presented here. We constructed an IL catalogue of 1200 stars: there are 707 stars in the first part (with at least 20 years of IL observations) and 493 stars in the second one (less than 20 years). In the case of μβ of IL stars observed at some stations (Blagoveschtschensk, Irkutsk, Mizusawa, Poltava and Pulkovo) we find the formal errors less than the corresponding Hipparcos ones and for some of them (stations Blagoveschtschensk and Irkutsk) even less than the new Hipparcos ones.http://www.doiserbia.nb.rs/img/doi/1450-698X/2011/1450-698X1182035D.pdfastrometryreference systems |
| spellingShingle | Damljanović G. Milić I.S. Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades Serbian Astronomical Journal astrometry reference systems |
| title | Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades |
| title_full | Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades |
| title_fullStr | Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades |
| title_full_unstemmed | Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades |
| title_short | Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades |
| title_sort | corrected μβ for stars of hipparcos catalogue from independent latitude observations over many decades |
| topic | astrometry reference systems |
| url | http://www.doiserbia.nb.rs/img/doi/1450-698X/2011/1450-698X1182035D.pdf |
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