2005A&A...429..739D


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET03:06:27

2005A&A...429..739D - Astronomy and Astrophysics, volume 429, 739-745 (2005/1-2)

Investigation on the southern part of the high density astrometric catalogs USNO B1.0, 2MASS and UCAC2.

DA SILVA NETO D.N., ANDREI A.H., ASSAFIN M. and VIEIRA MARTINS R.

Abstract (from CDS):

To access the astrometric capability of dense catalogues at southern declinations, the results from a sample of 76 ICRF sources of the observational program conducted at the 1.60m telescope of the Laboratorio Nacional de Astrofisica - LNA, Brazil, are examined. The observations were taken on mean epoch 1999.76, at Johnston V filter, in fields of size 5', with scale of 0.3"/pixel. The astrometric reduction is made relatively to the catalogs USNO B1.0 and 2MASS. The comparison between the ICRF position and the catalogue referred measured optical counterpart position reveals both catalogs aligned to the ICRF, but for an equatorial offset of the B1.0 at 90.4mas, to a significance level of 3.4 times the standard error. The direct comparison between catalogue and ICRF positions gives alike results. For the B1.0 there are also clumped variations on average ranging 96mas, but reaching up to the level of 300mas. Local corrections on the B1.0 positions were applied using the UCAC2 catalog. These were effective to remove the equatorial offset and the zonal variations, manifesting the internal consistency of the B1.0 positions. This supports the astrometric adherence of the UCAC2 catalog to the ICRS, as also shown by the 2MASS and referred results, since the systematic difference between 2MASS and UCAC2 is lowest.

Abstract Copyright:

Journal keyword(s): reference systems - astrometry

Simbad objects: 7

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Number of rows : 7

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 ICRF J081108.8-492943 QSO 08 11 08.80318 -49 29 43.5101   21.57       ~ 26 1
2 PMN J1237-5046 Rad 12 37 15.23945 -50 46 23.1744           ~ 14 1
3 PKS 1329-665 Rad 13 32 37.5056064232 -66 46 50.432697950           ~ 30 1
4 ICRF J133752.4-650924 QSO 13 37 52.44471 -65 09 24.8988   20.19       ~ 23 1
5 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 313 1
6 ICRF J181935.0-634548 Sy2 18 19 35.00241 -63 45 48.1926   16.80 14.40 13.4   ~ 137 1
7 ICRF J211630.8-805355 QSO 21 16 30.84588551 -80 53 55.2231002   20   19.50   ~ 34 1

    Equat.    Gal    SGal    Ecl

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2021.02.26-03:06:27

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