3 citations · 6 across the 11 of their papers we have counts for
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The Reflecting Heliometer of Rio de Janeiro after 6 Years of Activity
Sergio C. Boscardin, Costantino Sigismondi, Jucira L. Penna +3
Started its regular, daily operational phase in 2011 and installed in 2009 by the occasion of the Symp264 in the XXVII IAU GA at Rio de Janeiro, the results so far obtained show th…
Optical Deformations in Solar Glass Filters for High Precision Astrometry
Costantino Sigismondi, Alexandre Humberto Andrei, Sérgio Calderari Boscardin +2
Measuring the solar diameter at all position angles gives the complete figure of the Sun. Their asphericities have implications in classical physics and general relativity, and the…
Solar astrometry with Rio Astrolabe and Heliometer
Costantino Sigismondi, Sergio Calderari Boscardin, Alexandre Humberto Andrei +3
Monitoring the micro-variations of the solar diameter helps to better understand local and secular trends of solar activity and Earth climate. The instant measurements with the Ref…
The Heliometer of Rio de Janeiro in Operation - 2010 to 2013
Alexandre Humberto Andrei, Costantino Sigismondi, Eugenio Reis-Neto +2
Out of the three quantities that characterize the state of an isolated gaseous body: pressure, temperature and volume the radius is the only one directly measurable for the Sun, wh…
A new approach for the heliometric optics
Victor d'Avila, Eugenio Reis Neto, Alissandro Coletti +6
The heliometer of Fraunhofer in Koenigsberg (1824) is a refractor in which the lens is split into two halves to which is applied a linear displacement along the cut. Later in 1890s…