Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revised positions for the CIG galaxies   We present revised positions for the 1051 galaxies belonging to the
Karachentseva Catalog of Isolated Galaxies (CIG). New positions were calculated
by applying SExtractor to the Digitized Sky Survey CIG fields with a spatial
resolution of 1.2''. We visually checked the results and for 118 galaxies had
to recompute the assigned positions due to complex morphologies (e.g. distorted
isophotes, undefined nuclei, knotty galaxies) or the presence of bright stars.
We found differences between older and newer positions of up to 38'' with a
mean value of 2.96'' relative to SIMBAD and up to 38'' and 2.42'' respectively
relative to UZC. Based on star positions from the APM catalog we determined
that the DSS astrometry of five CIG fields has a mean offset in (RA, Dec) of
(-0.90'',0.93'') with a dispersion of 0.4''. These results have been confirmed
using the 2MASS All-Sky Catalog of Point Sources. The intrinsic errors of our
method combined with the astrometric ones are of the order of 0.5''.

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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn