Resumo

BUSTOS FIERRO, I. H.  e  CALDERON, J. H.. Local systematic differences in proper motions derived from 2MASS positions. Rev. mex. astron. astrofis [online]. 2016, vol.52, n.2, pp.413-417. ISSN 0185-1101.

We want to draw attention to local systematic differences that appear in the proper motions derived from 2MASS positions when they are compared with other astrometric catalogs such as UCAC4, SPM4 and USNO-B1. It is shown that 2MASS effectively causes these systematic effects in the proper motions of PPMXL and URAT1. Also it is shown that using 2MASS positions rectified with respect to UCAC4 the systematic pattern of the proper motions of URAT1 is eliminated. Therefore, we propose the use of rectified 2MASS positions in order to derive proper motions free from 2MASS systematics.

Palavras-chave : astrometry; catalogs; proper motions; methods: data analysis; methods: miscellaneous.

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