Solar astrometry with Rio Astrolabe and Heliometer

2013/11/14 by Costantino Sigismondi, Sigismondi, Costantino, Sergio Calderari Boscardin +14
Physics and Astronomy · #FOS: Physical sciences #History and Developments in Astronomy #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.IM #astro-ph.SR

paper · pdf · doi:10.48550/arxiv.1311.3472

1 page, 1 figure. Proceedings of LARIM XIV Latin American Regional IAU Meeting, Florianopolis 25-30 November 2013

openalex publication_date 2013/11/14 · arxiv created 2013/11/17 · arxiv updated 2013/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 Reflecting Heliometer of Observatorio Nacional in Rio de Janeiro have minimized optical and thermal distortion, statistically reducing air turbulence effects down to 0.01 arcsec. Contrarily to satellites RHRJ has unlimited lifetime, and it bridges and extends the measures made with drift-scan timings across altitude circles with 0.1 arcsec rms with Astrolabes. The Astrolabe in Rio operated from 1998 to 2009 to measure the solar diameter and the detected variations have statistical significance.

Citations

• The Heliometer of Rio de Janeiro in Operation - 2013 Calibration

Related

• The Heliometer of Rio de Janeiro in Operation - 2010 to 2013
• The solar diameter series of the CCD Solar Astrolabe of the Observatório Nacional in Rio de Janeiro measured during cycle 23
• Solar observations with Rio de Janeiro Danjon astrolabe: diameter variations and its correlations (1998-2000)
• The development of the Heliometer of the Observatorio Nacional of Rio de Janeiro and application to the study of the Sun-Earth system
• A cycle of measurements of the solar semidiameter with the astrolabe of Rio de Janeiro (1998-2009)