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IC 218


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BVRI surface photometry of mixed morphology pairs of galaxies. I. The first data set
We present multicolor broad band (BVRI) photometry for a sample of 11mixed morphology (E/S0+S) binary galaxies drawn from the KarachentsevCatalogue of Isolated Pairs of Galaxies (KPG). The data is part of anobservational programme devoted to the systematic photometric study ofone of the most complete and homogeneous pair samples available in theliterature. We present B band, B-filtered images, B, V, R and I surfacebrightness and (B-V), (B-R) and (B-I) color profiles as well asgeometric (epsilon = 1 - b/a, PA and a4/a) profiles for eachcomponent pair. In addition, integrated corrected B, V, R and Imagnitudes and integrated (B-V), (B-R) and (B-I) colors are alsopresented. Internal and external data comparisons show consistencywithin the estimated errors. Most of this subsample have photometricparameters homogeneously derived for the first time. Geometric profilesfrom our surface photometry along with the broad-band imaging and colorinformation have been used to re-evaluate morphology in all pairs. Wefind an important number of true mixed pairs with 5/11 (E+S) pairs inthe present sample. The remaining objects include 3 disky pairs(composed of S0 and S members), 2 early-type pair comprising E and S0members and 1 spiral-irregular pair. The measurements will be used in aseries of forthcoming papers where we try to identify and isolate themain structural and photometric properties of disk and ellipticalgalaxies at different stages of interaction.Based on data obtained at the 0.84 m and 1.5 m telescopes of theObservatorio Astronómico Nacional, San Pedro Mártir, BajaCalifornia, México, operated by the Instituto deAstronomía, UNAM.Tables 1-3 and Figs. 5 to 15 are only available in electronic form athttp://www.edpsciences.org

Galaxy coordinates. II. Accurate equatorial coordinates for 17298 galaxies
Using images of the Digitized Sky Survey we measured coodinates for17298 galaxies having poorly defined coordinates. As a control, wemeasured with the same method 1522 galaxies having accurate coordinates.The comparison with our own measurements shows that the accuracy of themethod is about 6 arcsec on each axis (RA and DEC).

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Observation and Astrometry data

Constellation:Cetus
Right ascension:02h17m07.30s
Declination:+01°16'57.0"
Aparent dimensions:0.912′ × 0.302′

Catalogs and designations:
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ICIC 218
HYPERLEDA-IPGC 8716

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