The Heliometer of Rio de Janeiro in Operation - 2013 Calibration

Abstract

Here the preliminary results of the calibration of the heliometric angle of the Heliometer in Rio de Janeiro are presented. They have been made in 2013 with a reference surveying rod, equipped with two metal spheres acting as artificial star, when illuminated by the Sun, and with the method of drift-scan timing.

3 pages, 1 figure, Proceedings of the conference ICRC 2013, July 2-9, 2013, CBPF, Rio de Janeiro, Brazil. To be published in the Brazilian Journal of Physics, after the paper of Andrei et al., The Heliometer of Rio de Janeiro in Operation 2010 to 2013

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• The solar diameter series of the CCD Solar Astrolabe of the Observatório Nacional in Rio de Janeiro measured during cycle 23
• The Figure of the Sun from Ground-based Experiments
• Solar astrometry with Rio Astrolabe and Heliometer