2002A&A...381...13C


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST06:29:37

2002A&A...381...13C - Astronomy and Astrophysics, volume 381, 13-20 (2002/1-1)

CCD astrometry of faint compact extragalactic radio sources. III.

COSTA E.

Abstract (from CDS):

Optical positions relative to the Hipparcos Catalogue (ESA, 1997HIP...C......0E) have been obtained for the optical counterparts of 38 faint (B∼20-24) southern compact extragalactic radio sources (CERS). Many of these sources are not detectable - or their coordinates not adequately measurable - by means of direct photography with a wide-field telescope, so the positions were determined using a multi-step procedure involving CCD and photographic observations. This method responds both to the requirement of attaining small positional errors, and the need to refer the positions to a standard astrometric system. Estimated precisions as good as 50 mas were achieved. For 16 of the above objects we are proposing a completely new optical identification or providing a revised finder. A comparison of our optical positions with available VLBI radio positions is presented. The residuals obtained are in most cases consistent with the precision of our optical data, and provide an evaluation of these CERS as radio/optical frame link sources (or their identification as astrophysically interesting astrometric outliers). Twenty nine of the CERS observed are either defining or candidate fiducial objects of the present International Celestial Reference System (ICRS, Ma et al., 1998AJ....116..516M) optical data we have obtained for them is potentially useful to help mantain and possibly improve the current link of the Hipparcos reference frame to the ICRS.

Abstract Copyright:

Journal keyword(s): astrometry - reference systems

Simbad objects: 41

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Number of rows : 41

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0013-005 QSO 00 16 11.08855479 -00 15 12.4453413   20.44 19.98 19.72   ~ 129 1
2 ICRF J002225.4+001456 BiC 00 22 25.4258623 +00 14 56.161217   21.1       ~ 105 1
3 ICRF J002442.9-420203 G 00 24 42.98993 -42 02 03.9507   22       ~ 61 0
4 QSO B0146+056 QSO 01 49 22.37089 +05 55 53.5687   20.7 19.0 20.30   ~ 117 1
5 QSO B0334-546 QSO 03 35 53.92489 -54 30 25.1147   20.0 20.0 17.78   ~ 40 1
6 ICRF J050321.1+020304 Sy2 05 03 21.1971480 +02 03 04.676648   22.500 21.350 20.682   ~ 180 1
7 QSO B0503-608 QSO 05 04 01.70113203 -60 49 52.5394101     19.5     ~ 32 1
8 QSO B0516-621 BLL 05 16 44.9259759952 -62 07 05.388736635 18.50 18.09 17.85 17.46   ~ 102 1
9 QSO J0730-116 QSO 07 30 19.11247420 -11 41 12.6005110     20.30 20.3   ~ 271 1
10 PKS 0733-17 Rad 07 35 45.81248037 -17 35 48.5022692           ~ 58 1
11 PKS 0736-332 Rad 07 38 16.94912 -33 22 12.7776           ~ 15 1
12 QSO B0738-674 QSO 07 38 56.49622760 -67 35 50.8260388     19.8 20.00   ~ 48 1
13 ICRF J081108.8-492943 QSO 08 11 08.80318 -49 29 43.5101   21.57       ~ 26 1
14 QSO B0920-397 QSO 09 22 46.41826064 -39 59 35.0683561   18.12 18.8     ~ 103 1
15 QSO B1145-676 QSO 11 47 33.4004260218 -67 53 41.777073042   19.66   16.6   ~ 46 1
16 QSO B1245-197 QSO 12 48 23.8980846 -19 59 18.588983   21.52 20.5     ~ 128 1
17 3C 283 rG 13 11 39.3 -22 16 41   20       ~ 83 1
18 [VV2006] J132304.3-445233 QSO 13 23 04.2505439851 -44 52 33.813892851     17.6     ~ 48 1
19 QSO B1351-018 QSO 13 54 06.89532213 -02 06 03.1904447   20.62 19.91 19.277   ~ 133 1
20 QSO B1352-104 QSO 13 54 46.5186890 -10 41 02.656054   18.20 18.4     ~ 141 1
21 QSO B1406-076 QSO 14 08 56.48120036 -07 52 26.6664200   20.3 18.4     ~ 278 1
22 QSO B1421-490 QSO 14 24 32.2373 -49 13 49.744   18.5       ~ 61 1
23 QSO B1430-178 QSO 14 32 57.69062238 -18 01 35.2486238   17.8 19.5 18.4   ~ 84 1
24 PKS 1541-82 rG 15 50 59.1822110092 -82 58 06.800163243   20.00       ~ 30 1
25 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 314 1
26 QSO B1622-297 Bla 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 379 0
27 QSO B1732-598 QSO 17 36 30.8523 -59 51 58.750   20.6       ~ 11 0
28 QSO B1758-651 QSO 18 03 23.49666700 -65 07 36.7612094   18.18       ~ 57 1
29 QSO B1903-802 QSO 19 12 40.01912850 -80 10 05.9464641   19.83 19.0 19.54   ~ 70 1
30 QSO B1929-457 QSO 19 32 44.88778041 -45 36 37.9287770   18.47 19.50 17.13   ~ 54 2
31 QSO B1936-155 QSO 19 39 26.65774750 -15 25 43.0584183   19.44 19.4 18.80   ~ 148 1
32 ICRF J195005.5+080713 QSO 19 50 05.53991482 +08 07 13.9808872     18.0     ~ 68 1
33 QSO B2025-538 QSO 20 29 35.0545055868 -53 39 07.315491638   20.6       ~ 18 1
34 3C 422 QSO 20 47 10.3670164140 -02 36 22.132220828   20.80 19.50     ~ 83 1
35 ICRF J205941.5-364554 PaG 20 59 41.59681380 -36 45 54.6077823           ~ 17 1
36 QSO B2059-786 QSO 21 05 44.96144716 -78 25 34.5470251   21.59 21 20.20   ~ 36 1
37 QSO B2105-489 Q? 21 08 50.768 -48 46 21.57   20.1       ~ 13 2
38 ICRF J211630.8-805355 QSO 21 16 30.84588551 -80 53 55.2231002   20   19.50   ~ 34 1
39 [VV98] J225504.2-084404 QSO 22 55 04.23979 -08 44 04.0213       20.5   ~ 46 1
40 QSO B2259-37 QSO 23 02 23.89064 -37 18 06.8423           ~ 35 1
41 [VV2006] J233954.5-331018 QSO 23 39 54.5351641 -33 10 16.881506     22.50 20.8   ~ 36 0

    Equat.    Gal    SGal    Ecl

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2021.05.09-06:29:37

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