Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results
Some differential reference stars catalogues around extragalactic radio sources obtained from photographic and CCD-observations at different observatories are considered. Compiled catalogue of star positions in fields of 30 ×30 is intended for reduction of ERS optical observations using the telesco...
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| Zitieren: | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results / V. Ryl'kov, A. Dement'eva, N. Narizhnaya, G. Pinigin, N. Maigurova, Yu. Protsyuk, V. Kleschenok, G. Bocsa, P. Popescu // Кинематика и физика небесных тел. — 2005. — Т. 21, № 5-додаток. — С. 328-332. — Бібліогр.: 6 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859730057622192128 |
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| author | Ryl'kov, V. Dement'eva, A. Narizhnaya, N. Pinigin, G. Maigurova, N. Protsyuk, Yu. Kleschenok, V. Bocsa, G. Popescu, P. |
| author_facet | Ryl'kov, V. Dement'eva, A. Narizhnaya, N. Pinigin, G. Maigurova, N. Protsyuk, Yu. Kleschenok, V. Bocsa, G. Popescu, P. |
| citation_txt | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results / V. Ryl'kov, A. Dement'eva, N. Narizhnaya, G. Pinigin, N. Maigurova, Yu. Protsyuk, V. Kleschenok, G. Bocsa, P. Popescu // Кинематика и физика небесных тел. — 2005. — Т. 21, № 5-додаток. — С. 328-332. — Бібліогр.: 6 назв. — англ. |
| collection | DSpace DC |
| container_title | Кинематика и физика небесных тел |
| description | Some differential reference stars catalogues around extragalactic radio sources obtained from photographic and CCD-observations at different observatories are considered. Compiled catalogue of star positions in fields of 30 ×30 is intended for reduction of ERS optical observations using the telescopes equipped with CCD-cameras. Photographic observations of the fields around 74 ERS were made at the Pulkovo Observatory, around 115 ERS – at the AO KNU, around 188 ERS – at the AIRA in Bucharest. The 208 fields around ERS at NAO using the telescope equipped with a CCD-camera were obtained. The first results of the creation of uniform compiled catalogue are given. Astrometric positions for stars brighter than 16 magnitude in more than 20 fields around ERS are presented. A comparison of our results with those of other authors is made.
|
| first_indexed | 2025-12-01T13:00:39Z |
| format | Article |
| fulltext |
REFERENCE STARS COMPILED CATALOGUE
AROUND EXTRAGALACTIC RADIO SOURCES.
REDUCTION TECHNIQUES AND THE FIRST RESULTS
V. Ryl’kov1, A. Dement’eva1, N. Narizhnaya1, G. Pinigin2, N. Maigurova2,
Yu. Protsyuk2, V. Kleschenok3, G. Bocsa4, P. Popescu4
1Main (Pulkovo) Astronomical Observatory, RAS (MAO RAS)
65/1 Pulkovskoye Shosse, 196140 St.-Petersburg, Russia
e-mail: vryl@gao.spb.ru
2Research Institute “Nikolaev Astronomical Observatory”, MES of Ukraine (NAO)
1 Observatorna Str., 54030 Mykolaiv, Ukraine
e-mail: pinigin@mao.nikolaev.ua
3Astronomical Observatory, National Taras Shevchenko University of Kyiv (AO KNU)
3 Observatorna Str., 04053 Kyiv, Ukraine
e-mail: klev@observ.univ.kiev.ua
4Astronomical Institute of the Romanian Academy (AIRA)
5 Cutitul de Argint Str., Bucharest, Romania
e-mail: petre@aira.astro.ro
Some differential reference stars catalogues around extragalactic radio sources obtained from pho-
tographic and CCD-observations at different observatories are considered. Compiled catalogue
of star positions in fields of 30′× 30′ is intended for reduction of ERS optical observations using
the telescopes equipped with CCD-cameras. Photographic observations of the fields around 74 ERS
were made at the Pulkovo Observatory, around 115 ERS – at the AO KNU, around 188 ERS –
at the AIRA in Bucharest. The 208 fields around ERS at NAO using the telescope equipped with
a CCD-camera were obtained. The first results of the creation of uniform compiled catalogue are
given. Astrometric positions for stars brighter than 16 magnitude in more than 20 fields around
ERS are presented. A comparison of our results with those of other authors is made.
INTRODUCTION
To connect optical and radio astrometrical coordinate systems it is very important to observe common objects
both in optic and radio waves. As the most ERS are very faint it is possible to resolve this problem in optical
range with ground-based telescopes using CCD-detectors. Currently, many programs are made to establish
reference frame around astrometrical extragalactic radio sources (ERS) [1, 4, 5]. This frame is needed to
observe ERS in optical range with sufficient accuracy without multistage link from the faint determined objects
to the bright reference stars.
We have four original star catalogues. These catalogues were obtained to observe faint ERS in future with
a CCD-camera [1]. Three of these catalogues were photographically obtained using the astrographs, and one of
them was obtained with the Axial Meridian Circle equipped with a CCD-matrix (see Table 1). Photographic
observations have been obtained with the Normal Astrograph (330/3464) at the Pulkovo Astronomical Ob-
servatory (MAO RAS) in the 1990s – 74 ERS fields (35 are calculated). 115 ERS fields have been obtained
with the Astronomical Observatory, National Taras Shevchenko University of Kyiv (AO KNU) Astrograph
(200/4126). 188 ERS fields have been performed with the Double Astrograph (380/600) at the Astronomical
Institute of the Romanian Academy (AIRA) in Bucharest. 208 ERS fields have been derived with the Axial
Meridian Circle (180/2480) using a CCD-matrix at the Nikolaev Astronomical Observatory.
These four catalogues have been reduced to about the same epoch. In order to increase the star position
density and accuracy around ERS it was decided to compile these four catalogues. Since they were obtained
with different telescopes and image registration techniques it was needed to link their position to common epoch
and to analyze the systematic coordinates differences of the same stars.
c© V. Ryl’kov, A. Dement’eva, N. Narizhnaya, G. Pinigin, N. Maigurova, Yu. Protsyuk, V. Kleschenok, G. Bocsa, P. Popescu, 2004
328
Table 1. Catalogues included to the reference stars compiled catalogue
Place Name Type Size Number Number Observation Number
of observations of catalogue of observations of fields, min of fields of stars epoch
Mykolaiv AMC1B CCD 60×24 208 14403 1996–1998 12–14
Bucharest PIRS-B Photo 60×60 188 4700 1991–2000 12–15
Pulkovo Pul ERS Photo 35×35 35 4500 1991–1995 10–16
Kyiv PIRS-K Photo 60×60 115 2875 1989–1993 12–15
THE COMPARISON OF CATALOGUES
The proper motions for considerable part of stars were taken from the Catalogue positions and proper motions
(UCAC) which consists of 48 millions of stars. It is clearly that the four considering catalogues are differ
one from another, i.e., they will be included in compiled catalogue with different weights. The catalogue of
the Nikolaev Observatory consist of the most measurements of alone star: up to 6. The catalogue of the Pulkovo
Observatory is situated at the second place: from 3 to 5 plates for field. All the others have one measurement
of each star of the field. All catalogues have the weights for compiled catalogue which are equals the number of
stars measurements.
Therefore, in order to detect the systematic differences some fields from the AMC1B and Pul ERS catalogues
have been compared, because the most coincided stars are included into them. The Mykolaiv catalogues and
the Pulkovo catalogues have been reduced to equinox J2000.0 and the differences of positions for coincided stars
have been calculated. The mean differences and their errors are given in Table 2.
Table 2. The comparison of coincided stars of the AMC1B (Mykolaiv) and Pul ERS (Pulkovo) catalogues
N Name Number of stars in field Mean (O–C)
of field Mykolaiv Pulkovo Coincided RA Err DEC Err
1 0026+346 106 148 57 −0.006 0.047 −0.41 0.43
2 0133+476 206 159 76 0.024 0.047 −0.27 0.35
3 0355+508 82 117 45 0.010 0.034 −0.21 0.31
4 0420+417 76 112 28 0.017 0.045 −0.34 0.44
5 0552+398 235 148 57 0.009 0.033 −0.13 0.36
6 0923+392 21 56 11 −0.060 0.026 −0.50 0.76
7 2200+420 278 92 53 0.007 0.041 −0.19 0.38
8 2337+264 98 92 44 0.018 0.036 −0.23 0.55
9 2351+456 78 110 25 −0.040 0.047 0.03 0.38
Figure 1. The residuals in RA and DEC for 76 coincided stars in ERS 0133+476 field
We can practically see obvious negative component in declination for all nine fields. The lesser positive
component take place in right ascension. If stars of this field from AMC1B to compare with coincided stars
from Tycho-2, then mean difference is −0.006s ± 0.055s in RA and systematic AMC1B coordinate overstating
is keeping: −0.22′′± 0.29′′. This fact needs in additional investigations for all stars fields.
329
Figure 2. The residuals in RA and DEC for 28 coincided stars in ERS 0133+476 field
THE COMPILED CATALOGUE
2503 stars of the main catalogue have been included in the former version of compiled catalogue for 25 reference
stars fields around ERS by means of mutual identifications coincided stars. These stars have proper motions in
UCAC. Their positions have been obtained from other compiled catalogues not coincided with main catalogue.
Coordinates of all stars are referred to J2000.0. Initial data for each included catalogue and the first results of
former version compiled catalogue for 25 fields are given in Table 3.
Table 3. The number of stars of reference stars compiled catalogue for ERS
N Name Main Number Stars
of field Pulkovo Mykolaiv Bucharest Kyiv catalogue of stars all∗
1 0026+346 164 116 55 25 P 148 201
2 0133+476 174 228 66 24 M 206 286
3 0355+508 165 146 63 25 P 117 187
4 0420+417 159 87 51 25 P 112 160
5 0552+398 165 260 66 25 M 235 325
6 0923+392 61 23 63 26 P 56 64
7 1641+399 145 133 55 24 P 131 156
8 1652+398 120 133 54 25 M 101 149
9 2200+420 107 309 68 25 M 278 327
10 2319+272 72 112 72 25 M 65 115
11 2337+264 104 112 47 25 M 98 146
12 2351+456 119 91 62 25 P 110 163
13 0234+285 – 93 74 25 M 90 136
14 0400+258 – 80 65 25 M 73 107
15 0420–014 – 123 71 22 M 55 61
16 0440–003 – 44 59 25 M 39 42
17 0457+024 – 81 66 (25) M 71 111
18 0458–020 – 86 25 24 M 34 62
19 0500+019 – 81 66 (25) B 53 74
20 0528+134 – 11 68 25 K 23 33
21 0711+356 – 106 54 24 M 95 130
22 0735+178 – 89 55 25 M 80 107
23 0738+313 – 96 54 24 M 88 111
24 0748+126 – 97 45 25 M 91 109
25 0906+015 – 62 64 22 M 54 91
The table consists of the number of stars in working catalogues, the initial catalogue (P – Pulkovo, M –
Mykolaiv, B – Bucharest, K – Kyiv), and the number of stars in compiled catalogue – common at working
catalogues and with the addition of stars from separate catalogues.
The equatorial coordinates of more than 3400 stars have been calculated for 25 fields around extragalactic
radio sources. They were reduced to epoch J2000.0 in the ICRS frame. Practically, all the fields included more
than 100 stars around ERS by diameter 35–40 arcminutes.
330
THE FARTHER WORK
All the processes of compiled catalogue creation will be carried out by three stages.
Stage 1. Obtaining compiled catalogue of reference stars to epoch J2000.0 by using the data from four above-
mentioned catalogues. Other catalogues (UCAC, CaMC, PPM) are used for proper motions. The problem has
been solved to take into account the catalogues weights equaled to number of measurements. The first results
of this stage for 25 catalogues are given in Table 3. For this stage it is supposed to obtain 35 fields for Pul ERS
calculated catalogues.
Stage 2. Stars without proper motions will be added to 35 catalogues. It is the stars that are absent in
famous catalogues. Positions for epochs of star observations will be appeared in the compiled catalogue. So, if
epoch differences for faint stars are not more than three years, the mean coordinates may be obtain.
Stage 3. The same investigations will be made for another three catalogues. In order to take into account
the AMC1B catalogue based on CCD-observations, as a main catalogue, it is necessary to analyze accurately its
systematic deviations. The analysis might be made using the stars with proper motions from other catalogues.
Coordinates of these stars will be compared with these ones from the Tycho-2, CaMC, UCAC [6] or USNO-B [3].
Taking into account that more than billion stars are included in the USNO-B catalogue, the importance of our
catalogues to be increased, the accuracy of reference star positions is invaluable.
Figure 3. The map of the stars field around ERS 1418+546. Size of the interior field is 30′ × 30′. The star number is
corresponded to star number in catalogue
FORMAT OF THE FORMER VERSION OF THE CATALOGUE
Preliminary compiled catalogue are given in the next format – 110 positions are given for each star. The co-
ordinates are in radians and in integer format without blank. All star positions recalculated to epoch J2000.0
using the proper motions from UCAC.
Positions
1 – 4 the star number by given catalogue;
5 – 11 the magnitude (from UCAC or obtained by observer);
12 – 28 RA in radian at observation epoch to ICRS system for J2000.0 equinox;
29 – 34 the error of mean RA, 0.001s;
35 – 37 the number of RA observations;
38 – 53 DEC in radian at observation epoch to ICRS system for J2000.0 equinox;
54 – 59 the error of mean DEC, 0.001′′;
331
60 – 62 the number of measurements that are used to obtained declination;
63 – 65 the inclusion index (0 or 1) of the AMC1B catalogue;
66 – 67 the inclusion index (0 or 1) of the PIRS-B catalogue;
68 – 69 the inclusion index (0 or 1) of the PIRS-K catalogue;
70 – 71 the inclusion index (0 or 1) of the Pul ERS catalogue;
72 – 83 RA of star in integer format HHMMSSDDD;
84 – 94 DEC of star in integer format ±GGMMSSDD;
95 – 102 the proper motion RA, mas/yr (without cos δ );
103 – 110 the proper motion DEC, mas/yr.
THE MAP OF THE STARS FIELD AROUND ERS
In order to comfort detected stars field, when observations are made with a CCD-detector, every stars field has
a map in pcx-format. In Fig. 3 the example of such map is given.
The positions of detected stars will be assumed to compare with selective stars from the ERL398 [5] and
UCAC catalogues. All versions of the catalogues for ERS are kept in magnetic tapes at the Laboratory of
Astrometry and Star Astronomy of the MAO RAS. These fields will be good standards to following observations
of the faint stars.
[1] Babenko Yu., Daniltsev A., Vertypolokh A., et al. // Rom. Astron. J.–2003.–13, N 1.–P. 77–81.
[2] Dement’eva A., Ryl’kov V. The Fields of Reference Stars for Optical Positional Observations of Astrometric
Extragalactic Radio Sources // Astron. and Astrophys. Transactions.–1995.–9.–P. 127–138.
[3] Monet D. G., Levine S. E., Canzian B., et al. The USNO-B Catalog // Astron. J.–2003.–125.–P. 984–993.
[4] Ryl’kov V., Dement’eva A., Narizhaja N. Catalogues of stars for CCD-observations of galactic and extragalactic
radio sources // Extension and Connection of reference frames using ground based CCD technique / Ed. G. Pinigin.–
2001.–P. 35–42.
[5] De Vegt C., Hindsley R., Zacharias N., Winter L. A Catalog of Faint Reference Stars in 398 Fields of Extragalactic
Radio Reference Frame Sources // Astron. J.–2001.–121.–P. 2815–2818.
[6] Zacharias N., Rafferty T. J., Zacharias M. I. The UCAC Astrometric Survey // Astronomical Data Analysis
Software and Systems IX: ASP Conf. Ser / Eds N. Manset, C. Veillet, D. Crabtree.–San Francisco: ASP, 2000.–
216.–P. 427.
332
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| id | nasplib_isofts_kiev_ua-123456789-79668 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0233-7665 |
| language | English |
| last_indexed | 2025-12-01T13:00:39Z |
| publishDate | 2005 |
| publisher | Головна астрономічна обсерваторія НАН України |
| record_format | dspace |
| spelling | Ryl'kov, V. Dement'eva, A. Narizhnaya, N. Pinigin, G. Maigurova, N. Protsyuk, Yu. Kleschenok, V. Bocsa, G. Popescu, P. 2015-04-03T18:20:00Z 2015-04-03T18:20:00Z 2005 Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results / V. Ryl'kov, A. Dement'eva, N. Narizhnaya, G. Pinigin, N. Maigurova, Yu. Protsyuk, V. Kleschenok, G. Bocsa, P. Popescu // Кинематика и физика небесных тел. — 2005. — Т. 21, № 5-додаток. — С. 328-332. — Бібліогр.: 6 назв. — англ. 0233-7665 https://nasplib.isofts.kiev.ua/handle/123456789/79668 Some differential reference stars catalogues around extragalactic radio sources obtained from photographic and CCD-observations at different observatories are considered. Compiled catalogue of star positions in fields of 30 ×30 is intended for reduction of ERS optical observations using the telescopes equipped with CCD-cameras. Photographic observations of the fields around 74 ERS were made at the Pulkovo Observatory, around 115 ERS – at the AO KNU, around 188 ERS – at the AIRA in Bucharest. The 208 fields around ERS at NAO using the telescope equipped with a CCD-camera were obtained. The first results of the creation of uniform compiled catalogue are given. Astrometric positions for stars brighter than 16 magnitude in more than 20 fields around ERS are presented. A comparison of our results with those of other authors is made. en Головна астрономічна обсерваторія НАН України Кинематика и физика небесных тел MS4: Positional Astronomy and Global Geodynamics Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results Article published earlier |
| spellingShingle | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results Ryl'kov, V. Dement'eva, A. Narizhnaya, N. Pinigin, G. Maigurova, N. Protsyuk, Yu. Kleschenok, V. Bocsa, G. Popescu, P. MS4: Positional Astronomy and Global Geodynamics |
| title | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results |
| title_full | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results |
| title_fullStr | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results |
| title_full_unstemmed | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results |
| title_short | Reference stars compiled catalogue around extragalactic radio sources. Reduction techniques and the first results |
| title_sort | reference stars compiled catalogue around extragalactic radio sources. reduction techniques and the first results |
| topic | MS4: Positional Astronomy and Global Geodynamics |
| topic_facet | MS4: Positional Astronomy and Global Geodynamics |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/79668 |
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