Person's information

Dr Elisa Felicitas Arias

Dr Elisa Felicitas Arias
Director of the Time Department

Bureau international des poids et mesures [BIPM]

Pavillon de Breteuil

92312 Sèvres Cedex


Felicitas is Director of the BIPM Time Department, where she is responsible for the BIPM's time and frequency activities focused on the computation, maintenance and dissemination of Coordinated Universal Time (UTC). She is Executive Secretary of the Consultative Committee for Time and Frequency (CCTF).

She is a member of the International Astronomical Union, contributing to a number of its commissions and working groups, in particular as vice-chair of the IAU Commission on Time. She is the BIPM delegate at the International Telecommunication Union (ITU) and the UN International Committee for Global Navigation Satellite Systems (ICG). She is also a corresponding member of the French Bureau des Longitudes.

Dr E. Felicitas Arias has been Director of the BIPM Time Department since 1999.

She obtained her degree in Astronomy from the University of La Plata (Argentina), and her PhD in Astrometry, Celestial Mechanics and Geodesy at the Observatoire de Paris in 1990. In Argentina, she is Professor at the University of La Plata, and she was Director of the Buenos Aires Naval Observatory from 1991 to 1999. She is widely known for her contributions to the definition and realization of the International Celestial Reference System while she was responsible for this activity at the International Earth Rotation and Reference Systems Service (IERS), between 1990 and 2000. She continues to cooperate with the IERS and the Observatoire de Paris in this field.

Felicitas has published about 110 scientific papers on time metrology and astrometry, and is frequently solicited for reviewing articles in specialized journals.

NMI Directors and Member State Representatives

BIPM staff in attendance

From 18 to 19 October 2017

International Committee for Weights and Measures

BIPM staff in attendance

From 16 to 20 October 2017

Consultative Committee for Units

BIPM staff in attendance

From 05 to 06 September 2017

2017 - Sound beginning in the CIPM MRA


From 13 to 24 November 2017

Meeting of the Presidents of the Consultative Committees

Executive Secretary

From 13 to 14 June 2017

CCTF Working Group on TAI

Executive Secretary

07 June 2017