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Parallaxes of five L Dwarfs with a Robotic Telescope
Y. Wang, H. R. A. Jones, R. L. Smart +14
We report the parallax and proper motion of five L dwarfs obtained with observations from the robotic Liverpool Telescope. Our derived proper motions are consistent with published…
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…