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Nova Centauri 2013 broad maximum from visual observations calibrated with same altitude stars
Costantino Sigismondi
A bright Nova in Centaurus was discovered on Dec 2, 2013 at magnitude V=5.5. Its luminosity reached mv=3.8 from Dec 5 to 7, becoming the brightest Nova of 2013 and of the last deca…
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 occultation of Arcturus in the Vatican
Costantino Sigismondi
The dome of Saint Peter's Basilica plays the role of the Moon during a stellar occultation and Arcturus is the target star. This occultation-like phenomenon is useful for introduci…
Considerations on the light curve of Nova Delphini 2013
Costantino Sigismondi
It is possible to evaluate the absolute magnitude of the Nova Delphini 2013 with visual observations submitted to AAVSO, following the works of Leonida Rosino at Asiago Observatory…
The Heliometer of Rio de Janeiro in Operation - 2013 Calibration
Costantino Sigismondi
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 r…
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…