A METHOD FOR LOCAL RECTIFICATION OF 2MASS POSITIONS WITH
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2016
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| _version_ | 1876451388377006080 |
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| author | I. H. Bustos Fierro |
| author_facet | I. H. Bustos Fierro |
| contents | A METHOD FOR LOCAL RECTIFICATION OF 2MASS POSITIONS WITH I. H. Bustos Fierro J. H. Calderón Física, Astronomía y Matemáticas methods catalogs Astrometry data analysis miscellaneous We propose to locally rectify 2MASS with respect to UCAC4 in order to diminish the systematic differences between these catalogs. We develop a rectification method that starts computing the weighted mean differences 2MASS −UCAC4 on a regular grid on the sky. The corrections that are later applied to 2MASS positions are obtained by a spline interpolation of the mean values calculated on the grid. The method is tested in four 3 ◦ × 3 ◦ fields in the ecliptical zone; after rectification in all of them the systematic differences are reduced well below the random differences. The 2MASS catalog rectified with the proposed method can be regarded as an extension of UCAC4 for astrometry, with an accuracy of around 90 mas in the positions, and with negligible systematic errors, for instance for the astrometric reduction of small field CCD images. 2016 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57146052011 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.52 |
| format | Artículo científico |
| id | redalyc_57146052011 |
| institution | Redalyc |
| language | en |
| publishDate | 2016 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | A METHOD FOR LOCAL RECTIFICATION OF 2MASS POSITIONS WITH I. H. Bustos Fierro Física, Astronomía y Matemáticas methods catalogs Astrometry data analysis miscellaneous A METHOD FOR LOCAL RECTIFICATION OF 2MASS POSITIONS WITH I. H. Bustos Fierro J. H. Calderón Física, Astronomía y Matemáticas methods catalogs Astrometry data analysis miscellaneous We propose to locally rectify 2MASS with respect to UCAC4 in order to diminish the systematic differences between these catalogs. We develop a rectification method that starts computing the weighted mean differences 2MASS −UCAC4 on a regular grid on the sky. The corrections that are later applied to 2MASS positions are obtained by a spline interpolation of the mean values calculated on the grid. The method is tested in four 3 ◦ × 3 ◦ fields in the ecliptical zone; after rectification in all of them the systematic differences are reduced well below the random differences. The 2MASS catalog rectified with the proposed method can be regarded as an extension of UCAC4 for astrometry, with an accuracy of around 90 mas in the positions, and with negligible systematic errors, for instance for the astrometric reduction of small field CCD images. 2016 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57146052011 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.52 |
| title | A METHOD FOR LOCAL RECTIFICATION OF 2MASS POSITIONS WITH |
| topic | Física, Astronomía y Matemáticas methods catalogs Astrometry data analysis miscellaneous |
| url | https://www.redalyc.org/articulo.oa?id=57146052011 |